共查询到20条相似文献,搜索用时 78 毫秒
1.
Maribel Navarro Angel Rubén Higuera-Padilla Miriam Arsenak Peter Taylor 《Transition Metal Chemistry》2009,34(8):869-875
New trans-platinum complexes of clotrimazole (CTZ) have been prepared and characterized. Their interaction with DNA and activity against
tumour cell lines were evaluated. [Pt (CTZ)2I2] (1) was synthesized by the reaction of K2PtCl4, KI and CTZ, and [Pt(CTZ)2Cl2] (2) by direct reaction of K2PtCl4 with CTZ. These complexes were characterized by a combination of elemental analysis, molar conductivity, UV–Vis, IR, and
NMR spectroscopy in one and two dimensions. DNA–platinum complex interactions were studied by spectroscopic, thermal denaturation
and viscosity titration measurements. Covalent interaction studies were also performed. From these results we suggest that
complexes 1 and 2 interact with the minor groove of DNA. Both complexes showed growth inhibitory effects on four out of the six tumour cells
lines with GI50 (50% growth inhibition) values in the 5–25 μM range, but there was no indication of cytotoxicity over the range of concentrations
tested. 相似文献
2.
Lead(II) coordination polymer [Pb(5,5′-dmbpy)(μ-NO3)2]
n
(1) and mononuclear complex [Pb(6,6′-dmbpy)(NO3)2] (2) (where 5,5′-dmbpy is 5,5′-dimethyl-2,2′-bipyridine and 6,6′-dmbpy is 6,6′-dimethyl-2,2′-bipyridine) were synthesized from
reaction of lead(II) nitrate with 5,5′-dmbpy and 6,6′-dmbpy, respectively. Both complexes were thoroughly characterized by
elemental analysis, infrared, 1H and 13C NMR, UV–Vis, emission spectroscopy, as well as single-crystal X-ray diffraction. Polymer 1 possesses one-dimensional (1D) chain structure, whilst complex 2 exhibits a discrete complex which provide an extended chain parallel to the [001] direction, via weak intermolecular C–H···O
hydrogen bonding. Coordination number of Pb2+ in 1 and 2 are 8 and 6, respectively, with the stereochemically active lone pair, resulting in the hemidirected geometry for both complexes.
The nitrate anions exhibit a tridentate chelating/bridging mode in 1, and a bi-chelating mode in 2. The supramolecular features in these complexes are guided/influenced by weak directional intermolecular C–H···O hydrogen
bonding (1 and 2) together with π–π and C–H···π (1) interactions. The luminescence studies of 1 and 2 confirmed that the position of methyl substituent on 2,2′-bipyridine rings has a profound effect on the fluorescence emissions. 相似文献
3.
Abstract
Four complexes of 3,3-diphenylpropanoate (L) and 4,4′-bipyridine as auxiliary bridging ligands were synthesized and characterized, namely [Zn(L)2(4bpy)(EtOH)2]∞ (1), [Co(L)2(4bpy)(EtOH)2]∞ (2), [Ni(L)2(4bpy)(EtOH)2]∞ (3), and [Cu(L)2(4bpy)(H2O)]∞ (4) (4bpy = 4,4′-bipyridine). X-ray single-crystal diffraction analyses show that complexes 1–4 all take one-dimensional (1D) fishbone-like structures incorporating bridging 4bpy ligands. The complexes show different supramolecular frameworks interlinked via intermolecular hydrogen bonds, π···π stacking, and/or C–H···π supramolecular interactions. Complex 3 only has a simple one-dimensional fishbone-like chain, whereas complexes 1 and 2 show two-dimensional supramolecular structures by interchain C–H···O hydrogen bonds. Complex 4 is assembled into two-dimensional layers and then an overall three-dimensional framework by a combination of interchain O–H···O hydrogen bonds and C–H···π supramolecular interactions. The luminescent properties of the ligands and their complexes were investigated. 相似文献4.
Sahra C. Lemos Silmar J. S. Franchi Adelino V. G. Netto Antonio E. Mauro Oswaldo Treu-Filho Regina C. G. Frem Eduardo Tonon de Almeida Cláudia Torres 《Journal of Thermal Analysis and Calorimetry》2011,106(2):391-397
This work describes the synthesis, characterization, and the thermal behavior investigation of four palladium(II) complexes
with general formulae [PdX2(mba)2], in which mba = N-methylbenzylamine and X = OAc− (1), Cl− (2), Br− (3) or I− (4). The complexes were characterized by elemental analysis, infrared vibrational spectroscopy, and 1H nuclear magnetic resonance. The stoichiometry of the complexes was established by means of elemental analysis and thermogravimetry
(TG). TG/DTA curves showed that the thermodecomposition of the four complexes occurred in 3–4 steps, leading to metallic palladium
as final residue. The palladium content found in all curves was in agreement with the mass percentages calculated for the
complexes. The following thermal stability sequence was found: 3 > 2 > 4 > 1. The geometry optimization of 1, 2, 3, and 4, calculated using the DFT/B3LYP method, yielded a slightly distorted square planar environment around the Pd(II) ion made
by two anionic groups and two nitrogen atoms from the mba ligand (N1 and N2), in a trans-relationship. 相似文献
5.
Hong-Mei Ye Ning Ren Jian-Jun Zhang Shu-Jing Sun Juan-Fen Wang 《Structural chemistry》2010,21(1):165-173
A new series of lanthanide complexes [Ln(3,4-DMBA)3phen]2 [Ln(III) = Nd(1), Sm(2), Tb(3) and Dy(4), 3,4-DMBA = 3,4-dimethylbenzoate, phen = 1,10-phenanthroline] have been synthesized and characterized by elemental analysis,
infrared spectra and TG-DTG techniques. The single crystals of the complexes 3 and 4 have been obtained and their structures have been determined by single-crystal X-ray diffraction. In the complexes 3 and 4, each Ln(III) ion is coordinated by four bidentate-bridging 3,4-DMBA ligands, one bidentate-chelating 3,4-DMBA group and
one bidentate-chelating phen ligand, giving a coordination number of eight. The complex 3 shows bright green luminescence under ultraviolet light in the solid state. Thermal analysis of the complexes 1–4 are discussed by TG-DTG and IR techniques. The non-isothermal kinetics of the complexes 1–4 are investigated by using double equal-double step method. The thermodynamic parameters (ΔH
≠
, ΔG
≠
and ΔS
≠
) and kinetic parameters (activation energy E and the pre-exponential factor A) of the four complexes are also calculated. 相似文献
6.
G. A. Abakumov V. K. Cherkasov A. V. Krashilina I. L. Eremenko S. E. Nefedov 《Russian Chemical Bulletin》1998,47(11):2262-2270
New mononuclear 3,6-di-tert-butyl-o-benzosemiquinone complexes of copper(1) with bis(diphenylphosphine) ligands were synthesized: (DBSQ)Cu(dppe) (1) (DBSQ=3,6-di-tert-butyl-o-benzosemiquinone and dppe=1,2-bis(diphenylphosphino)ethane), (DBSQ)Cu(dppp) (2) (dppp=1,3-bis(diphenylphosphino)propane), (DBSQ)Cu(dppn) (3) (dppn=2,2′-bis(diphenylphosphino)-1,1′-binaphthyl), and (DBSQ)Cu(dppfc) (4) (dppfc=1,1′-bis(diphenylphosphino)ferrocene). The compositions and structures of complexes1–4 were characterized by elemental analysis and electronic absorption, IR, and ESR spectroscopy. The molecular structures of
complexes3 and4 were established by X-ray diffraction analysis. The reactions of elimination and replacement of neutral ligands in the coordination
sphere of the complexes were studied by ESR spectroscopy.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2333–2340, November, 1998. 相似文献
7.
K. Ramalingam R. Thiruneelakandan G. Bocelli L. Righi 《Transition Metal Chemistry》2012,37(3):265-270
The complexes trans-[Ni(4-MP)2(NCS)2]·MeCN (1) and trans-[Ni(3-MP)2(NCS)2] (2) (4-MP = tri(4-methylphenyl)phosphine, 3-MP = tri(3-methylphenyl)phosphine) were prepared and characterized by IR, UV–visible,
NMR spectra, CV, TGA and single crystal X-ray crystallography. Both the complexes have planar geometry and are diamagnetic.
The Ni–P distances in both complexes are relatively short as a result of strong back donation from nickel to phosphorus. The
phenyl rings in the 3-MP analogue (2) show increased pitching with reference to the plane formed by the ipso carbons due to increased steric effects. For complex
(2), the N–Ni–N and P–Ni–P angles are significantly lower than the almost linear N–Ni–N and N–Ni–P angles observed for both
complex (1) and trans-[Ni(PPh3)2(NCS)2]. This observation indicates that the 3-methylphosphine ligand forces complex (2) to distort towards a tetrahedral geometry. IR spectra of both complexes show strong bands around 2,090 cm−1 due to N-coordinated thiocyanate, while the electronic spectra contain d–d transitions around 452 nm. Cyclic voltammograms
show that the irreversible one-electron reduction potentials increase in the following order: trans- [Ni(PPh3)2(NCS)2] < trans- [Ni(3-MP)2(NCS)2] < trans-[Ni(4-MP)2(NCS)2], revealing the electron releasing effect of the methyl groups. The planar complexes exhibit interallogony in coordinating
solvents. 相似文献
8.
YOSHINORI TAKASHIMA KAZUYA SAKAMOTO YOSHIFUMI OIZUMI HIROYASU YAMAGUCHI SHIGEHIRO KAMITORI AKIRA HARADA 《Journal of inclusion phenomena and macrocyclic chemistry》2006,56(1-2):45-53
Cyclodextrins (α-CD, β-CD and 2,6-di-O-dimethyl-β-CD (DM-β-CD)) were found to form inclusion compounds with thiophenes (thiophene (T), bithiophene (2T)) in water and in crystalline states. The structures of α-CD–T, β-CD–2T, and DM-β-CD–2T inclusion complexes were determined by X-ray crystallography. DM-β-CD forms a 1:1 cage type complex with 2T. In contrast, β-CD formed 2:3 (CD:guest) complexes with thiophene and α-CD formed 2:3 complexes, both of the channel type. These inclusion complexes were found to polymerize by FeCl3 in the inclusion compounds in water. The products were formed poly-pseudo-rotaxane between cyclodextrins and poly(thiophene) characterized by IR, 1H-NMR and 13C CP/MAS NMR. The molecular weights of the poly-pseudo-rotaxanes with poly(thiophene) were determined by the MALDI-TOF mass spectra to be 3000–5000. In comparison between poly-pseudo-rotaxane (DM-β-CD–poly(thiophene)), authentic poly(thiophene) and the washed DM-β-CD–poly(thiophene) which was washed with DMF to dethread DM-β-CD, these poly-pseudo-rotaxane was characterized by Raman, UV–vis and fluorescence spectra. The maximum emission band of DM-β-CD–poly(thiophene) shifted to a shorter wavelength. The hypsochromic shift was derived from poly-pseudo-rotaxane with DM-β-CD. 相似文献
9.
Nathan C. Tice Chad A. Snyder Andrew Z. Preston Marika B. Wieliczko Jason O. E. Young Daniel F. Hinson 《Transition Metal Chemistry》2012,37(2):141-147
A series of 1,2-diacyl cyclopentadienyl tricarbonyl manganese and rhenium complexes, [M(CO)3{η5-1,2-C5H3(CO-(R)2}] (3a–c and 4a–b), were isolated utilizing a straightforward, 3-step route. The synthetic pathway began with a 1,2-diacyl cyclopentadiene
(fulvene), followed by the formation of its corresponding thallium salt and transmetallation with the appropriate pentacarbonyl
metal bromide. X-ray crystallographic analysis and high-accuracy mass spectrometry confirmed the structures of the both the
4-methoxyphenyl and 4-chlorophenyl diacyl rhenium complexes, [Re(CO)3{η5-1,2-C5H3(CO-(4-OCH3)C6H4)2}] (4a) and [Re(CO)3{η5-1,2-C5H3(CO-(4-Cl)C6H4)2}] (4b). Diacyl complexes 3a–c and 4a–b were then ring-closed with hydrazine hydrate to form their corresponding pyridazine complexes, [M(CO)3{η5-1,2-C5H3(1,4-(R)2N2C2}] (5a–c and 6a–b), in good yields (60–83%). The pyridazyl ligands were found to be relatively labile, and recrystallization of the target
complexes 5a–c and 6a–b afforded only the free pyridazine ligands. 相似文献
10.
Ming-Li Liu Jian-Min Dou Da-Cheng Li Da-Qi Wang Jian-Zhong Cui 《Transition Metal Chemistry》2012,37(1):117-124
The thiosemicarbazide and hydrazide Cu(II) complexes, [Cu3L21(py)4Cl2] (1), [Cu(HL2)py] (2) and [Cu(HL3)py] (3), (H2L1 = 1-picolinoylthiosemicarbazide, H3L2 = N′-(2-hydroxybenzylidene)-3-hydroxy-2-naphthohydrazide, H3L3 = 2-hydroxy-N′-((2-hydroxy-naphthalen-1-yl)methylene)benzohydrazide) have been prepared and characterized through physicochemical and spectroscopic
methods as well as X-ray crystallography. Complex 1 has a centrosymmetric structure with –N–N– bridged Cu3 skeleton. Neighboring molecules are linked into a 3D supermolecular framework by π–π stacking interactions, N–H···Cl and
C–H···Cl hydrogen bonds. Complexes 2 and 3 have similar planar structures but different dimers formed by concomitant Cu···N and Cu···O interactions, respectively. Solvent
accessible voids with a volume of 391 ?3 are included in the structure of complex 2, indicating that this complex is a potential host candidate. Thermogravimetric analysis shows that the three complexes are
stable up to 100 °C. 相似文献
11.
N. A. Sanina L. A. Syrtsova E. S. Chudinova N. I. Shkondina T. N. Rudneva A. I. Kotel’nikov S. M. Aldoshin 《Russian Chemical Bulletin》2009,58(3):566-571
The NO-donor ability of new binuclear tetranitrosyl complexes of the μ-N—C—S type, namely, bis(5-methylbenzimidazol-2-ylthio)-
(1), bis(benzimidazol-2-ylthio)- (2), and bis(benzothiazol-2-ylthio)(tetranitrosyl)diiron (3), was studied in aqueous solutions by spectrophotometry. All kinetic regularities obtained for complexes 1–3 are well described in terms of formalism of pseudo-first-order reactions. The apparent first-order reaction rate constants
for NO evolution by the complexes to solution were determined. Complexes 1–3 are good donors of NO. The structures of the complexes and the effect of their stabilization by hemoglobin were compared.
The stabilization effect is explained by different basicities of the sulfur-containing ligands in the complexes studied. 相似文献
12.
Wen-Kui Dong Li Li Yin-Xia Sun Jun-Feng Tong Jian-Chao Wu 《Transition Metal Chemistry》2010,35(7):787-794
Two CoII complexes, namely {[CoL(MeOH)(μ-OAc)]2Co}·2MeCN·2MeOH (1) and {[CoL(EtOH)(μ-OAc)]2Co}·3EtOH (2) (H2L=3,3′-dimethoxy-2,2′-[(1,3-propylene)dioxybis(nitrilomethylidyne)]diphenol), have been synthesized and characterized by X-ray
crystallography. Both complexes contain octahedral coordination geometries, comprising three CoII atoms, two deprotonated bisoxime L2− units in which four μ-phenoxo oxygen atoms form two [CoL(X)] (X = MeOH or EtOH) units, two acetate ligands coordinated to
three CoII centers through Co–O–C–O–Co bridges, and coordinated and non-coordinated solvent. Both complexes exhibit 2D supramolecular
networks through different intermolecular hydrogen-bonding interactions. 相似文献
13.
Synthesis, crystal structures and DNA-binding properties of two new mononuclear copper(II) complexes
Two mononuclear copper(II) complexes, [Cu(bpy)2(CH3OH)](pic)2 (1) and [Cu(Me2bpy)2(H2O)](pic)2 (2) (bpy = 2,2′-bipyridine; Me2bpy = 4,4′-dimethyl-2,2′-bipyridine; Hpic = 2,4,6-trinitrophenol), were synthesized and characterized by elemental analyses,
conductivity measurements, IR, UV–Visible spectroscopy and single crystal X-ray analyses. Both complexes 1 and 2 are mononuclear compounds. The copper atom in complex 1 is in a distorted square pyramidal geometry with a CuN4O chromophore as revealed from the τ value (0.25), while the Cu(II) ion in complex 2 displays a distorted trigonal bipyramidal stereochemistry with τ = 0.72. Hydrogen bonding interactions and π–π stacking interactions
link the mononuclear copper complex 1 or 2 into a 1D infinite chain. The interactions of the two mononuclear complexes with herring sperm DNA (HS-DNA) have been studied by UV–visible absorption titration, fluorescence titration and ethidium bromide (EB) displacement
experiments. The results suggest that both complexes might bind to DNA by intercalation. 相似文献
14.
A Schiff base ligand containing thiocarbamide group of 4-phenyl-1-(4-methoxyl-1-phenylethylidene)thiosemicarbazide (HL) and
its three mononuclear metal complexes of ZnL2 (1), NiL2 (2), and CuL2 (3) have been synthesized. Elemental analysis, IR, and X-ray single crystal diffraction characterizations for the ligand and
the three complexes have been carried out. In the three complexes, the central metallic ions of Zn2+, Ni2+, and Cu2+ coordinate with two deprotonated ligands of L−, respectively. In 1, Zn2+ ion adopts a distorted tetrahedral geometry, while in 2 and 3, both the Ni2+ and Cu2+ ions possess distorted square planar configurations. For the four compounds, UV–Vis spectra have been measured and DFT calculations
at B3LYP/LANL2DZ level of theory prove that the electronic spectra of HL and 1 are corresponding with electronic transitions of n → π* and π → π* in the ligand itself and the electronic spectra of 2 and 3 are attributed to intraligand electronic transitions as well as d–d electronic transitions. Electrochemical investigations reveal that the different metal–ligand interactions have changed the
peak shapes and peak locations, which are corresponding with the DFT-B3LYP/LANL2DZ calculational results. Fluorescence spectra
measurements indicate that the ligand emits purple fluorescence and the complex 1 emits stronger blue fluorescence, while the complexes 2 and 3 quench fluorescence. The thermal analyses result show that the three complexes undergo two similar decomposition processes
because of their similar geometric configurations. 相似文献
15.
A. V. G. Netto Regina C. G. Frem A. E. Mauro Marisa S. Crespi H. E. Zorel Jr 《Journal of Thermal Analysis and Calorimetry》2007,87(3):789-792
Synthesis, spectroscopic characterization
and thermal behavior of pyrazolate-bridged palladium complexes [Pd(μ-Pz)2]n
(1), [Pd(μ-mPz)2]n
(2), [Pd(μ-dmPz)2]n
(3), [Pd(μ-IPz)2]n
(4) {pyrazolate (Pz–),
4-methylpyrazolate (mPz–), 3,5-dimethylpyrazolate
(dmPz–), 4-iodopyrazolate (IPz–)}
have been described in this work. The exobidentate coordination mode of pyrazolato
ligands in 1–4
was inferred on basis of IR spectroscopic evidences. TG investigations indicated
that the introduction of substituents at the 4 position in the pyrazolyl moiety
into coordination polymers do not affect significantly their thermal stability,
whereas at the 3 and 5 position reduced the stability of the main chain. Metal
palladium was the final product of the thermal decompositions, which was identified
by X-ray powder diffraction. 相似文献
16.
Sumitava Khan Subhasis Roy Kishalay Bhar Partha Mitra Alexandra M. Z. Slawin Barindra Kumar Ghosh 《Transition Metal Chemistry》2011,36(1):99-106
Two hexacoordinated mononuclear Co(III) compounds of the type cis-[Co(L)(N3)2] X [1, X = ClO4; 2, X = PF6; L = N,N′-(bis(pyridine-2-yl)benzylidine)-1,4-butanediamine] have been synthesized and characterized by physicochemical and spectroscopic
methods. The crystal structures of complexes 1 and 2 both have distorted octahedral geometry with two terminal azides in mutual cis orientations. In the crystalline state, two
mononuclear units of 1 are associated by weak C–H…π interactions to produce a dimeric unit, which packs through C–H…O hydrogen bonds and π…π interactions
leading to a 2-D continuum. The mononuclear units in 2 are engaged in weak cooperative intermolecular C–H…π interactions and multiple C–H…F hydrogen bonds giving rise to a 3-D
network structure. These diamagnetic compounds are redox active and show luminescence in DMF solutions. 相似文献
17.
M. S. Chernov’yants N. V. Aleshina I. V. Burykin 《Journal of Analytical Chemistry》2011,66(3):280-284
A procedure was developed for the determination of the following thioamides based on thiazole, 1,3,4-thiadiazole, 1,2,4-triazole,
and tetrazole: 2-mercaptothiazole (I), 2-mercapto-1,3,4-thiadiazole (II), 2-mercapto-5-methyl-1,3,4-thiadiazole (III), 3-mercapto-1,2,4-triazole (IV), 3-mercapto-4-methyl-1,2,4-triazole (V), and 5-mercapto-1-methyltetrazole (VI). The determination was performed by reversed-phase HPLC on a column (150 × 4 mm) packed with Diaspher-110-C18 (5 μm) using
elution with an acetonitrile-acetate buffer solution (pH 4.70) mixture (5: 95). Detection was performed at the light absorption
maximums of compounds I (320 nm), II (305 nm), III (310 nm), IV (260 nm), V (254 nm), and VI (245 nm). The calibration graphs were linear over the following concentration ranges (μg/mL): 0.47–11.72 (I), 0.47–11.82 (II), 0.53–13.22 (III), 0.40–10.11 (IV), 0.46–11.52 (V), and 0.46–11.62 (VI). The limits of detection were 0.45, 0.43, 0.50, 0.37, 0.41, and 0.42 μg/mL for compounds I–VI, respectively. Conditions for the separation of a mixture of compounds I and III–V and for the quantitative determination of compounds I–VI by capillary zone electrophoresis (CZE) were optimized. CZE was performed on a quartz capillary of size 60 cm (effective length of 50 cm) × 75 μm at a voltage of
20 kV with a borate buffer solution (pH 9.18). The procedure allowed us to evaluate the concentrations of substances in the
ranges of 1.17–93.75 (I), 1.18–94.54 (II), 1.32–105.76 (III), 1.01–101.13 (IV) 1.15–115.16 (V), and 1.16–116.15 (VI) μg/mL with the detection limits of 1.10, 1.11, 1.20, 0.96, 1.01, and 1.02 μg/mL for compounds I–VI, respectively. 相似文献
18.
Rafał Frański Błażej Gierczyk Grzegorz Schroeder Stefan Pieper Andreas Springer Michael Linscheid 《Central European Journal of Chemistry》2007,5(1):316-329
By mixing 1,2,4-triazolium salts (precursors of N-heterocyclic carbenes 1–6) with mercury acetate, a number of complexes have been obtained under electrospray ionization condition. Carbenes 1 and 2 contain one carbene center; therefore, they are able to bond only one mercury cation. Carbenes 3–5 contain two carbene centers; therefore, they can bond two mercury cations. Mercury complexes of 1–5 always contain an acetate anion attached to a mercury cation. Carbene 6 also contains two carbene centers; however, its structure allows formation of a complex containing mercury bonded simultaneously
to both centers, therefore, the complex that does not contain an acetate anion. The MS/MS spectra taken for complexes of carbenes
1–5 have shown formation of a cation corresponding to N1 substituent (adamantyl or benzyl), and those of complexes of carbenes
3–5 (doubly charged ions) have also shown the respective complementary partner ions. Mercury complex of 2 has yielded some other interesting fragmentation pathways, e.g. a loss of the HHgOOCCH3 molecule. The fragmentation pathway of the mercury complexes of 6 was found to be complicated. 相似文献
19.
Shu-Jing Sun Juan-Fen Wang Ning Ren Jian-Jun Zhang Hong-Mei Ye Shu-Ping Wang 《Structural chemistry》2012,23(1):79-89
Some binuclear lanthanide complexes with the general formula [Ln(2,3-DClBA)3bipy]2 (Ln = Sm(1), Eu(2), Tb(3), Dy(4), and Ho(5); 2,3-DClBA = 2,3-dichlorobenzoate; bipy = 2,2′-bipyridine) were synthesized and characterized by elemental analysis, molar
conductance, infrared, ultraviolet, luminescent spectroscopy, thermogravimetry, and different thermogravimetry (TG–DTG) techniques.
The single crystals of the complexes have been obtained except the complex 2 and their structures have been determined by single-crystal X-ray diffraction. The four complexes are isostructural and the
rare earth ions are all nine coordinated. The two rare earth ions in each complex are linked by two bridging bidentate and
two chelating-bridging tridentate carboxylate groups. Under ultraviolet light excitation, the europium and terbium complexes
exhibited characteristic red fluorescence of Eu3+ ion and green fluorescence of Tb3+ ion at room temperature. The non-isothermal kinetics was investigated by using the integral isoconversional non-linear (NL-INT)
and the Popescu methods. The mechanism functions of the first decomposition step of the complexes 3–5 were determined. Meanwhile, the thermodynamic parameters (ΔG
≠
, ΔH
≠, and ΔS
≠) at DTG peak temperatures were also calculated. 相似文献
20.
Xi-ke gao Jian-min dou Da-cheng li Feng-ying dong Da-qi wang 《Journal of inclusion phenomena and macrocyclic chemistry》2005,53(1-2):111-119
Five novel 2,3-naphtho crown ether group 10 metal bis(dithiolate) complexes, [Na(N15C5)2]2[Pd(mnt)2] (1), [Na(N15C5)]2[Pd(i-mnt)2] (2) and [K(N18C6)]2[M(i-mnt)2] (3
5) (where mnt = 1,2-dicyanoethylene-1,2-dithiolate, i-mnt = 1,1-dicyanoethylene-2,2-dithiolate and M = Ni, Pd, Pt for complexes
3–5, respectively), have been synthesized and characterized by elemental analysis, FT-IR, UV–Visible spectra and single crystal
X-ray diffraction. X-ray diffraction analyses reveal that complexes 1 and 2 have different structural features while complexes 3–5 are structurally isomorphous. Complex 1 consists of two [Na(N15C5)2]+ sandwich complex cations and one [Pd(mnt)2]2− anion, affording a zero-dimensional structure. For 2, the [Na(N15C5)]+ mono-capped complex cations act as the bridges linking the [Pd(i-mnt)2]2− anions into a 1D infinite chain through Na–N interactions and SȮFC and SȮFπ interactions are observed in the resulting chain.
Complexes 3–5 all consist of two [K(N18C6)]+ complex cations and one [M(i-mnt)2]2− (M = Ni, Pd or Pt) anion and the complex molecules are linked into␣1D␣chains by the bridging K–O(ether) interactions between
the adjacent [K(N18C6)]+ units. What’s novel is that the resulting chains are assembled into novel 2D networks through interchain π–π stacking interactions
between the neighboring naphthylene moieties of N18C6. The stack model of naphthylene group in complexes 3–5 is discussed. 相似文献