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1.
Mihaela Badea Rodica Olar Dana Marinescu Gina Vasile 《Journal of Thermal Analysis and Calorimetry》2008,92(1):205-208
This paper reports the investigation of the thermal stability of a series of new complexes with mixed ligands of the type
[M(en)(C3H3O2)2]·nH2O ((1) M=Ni, n=2; (2) M=Cu, n=0; (3) M=Zn, n=2; en=ethylenediamine and (C3H3O2)=acrylate anion). The thermal behaviour steps were investigated in a nitrogen flow. The thermal transformations are complex
processes according to TG and DTA curves including dehydration, ethylenediamine elimination as well as acrylate thermolysis.
The final products of decomposition are the most stable metal oxides except for complex (2) that generates metallic copper. 相似文献
2.
F. M. Veljković J. B. Djustebek M. V. Veljković A. A. Perić‐Grujić S. R. Veličković 《Journal of mass spectrometry : JMS》2012,47(11):1495-1499
The theoretical calculations have predicted that nonmetal‐doped potassium clusters can be used in the synthesis of a new class of charge‐transfer salts which can be considered as potential building blocks for the assembly of novel nanostructured material. In this work, KnCl (n = 2–6) and KnCln?1 (n = 3 and 4) clusters were produced by vaporization of a solid potassium chloride salt in a thermal ionization mass spectrometry. The ionization energies (IEs) were measured, and found to be 3.64 ± 0.20 eV for K2Cl, 3.67 ± 0.20 eV for K3Cl, 3.62 ± 0.20 eV for K4Cl, 3.57 ± 0.20 eV for K5Cl, 3.69 ± 0.20 eV for K6Cl, 3.71 ± 0.20 eV for K3Cl2 and 3.72 ± 0.20 eV for K4Cl3. The KnCl+ (n = 3–6) clusters were detected for the first time in a cluster beam generated by the thermal ionization source of modified design. Also, this work is the first to report experimentally obtained values of IEs for KnCl+ (n = 3–6) and KnCln?1+ (n = 3 and 4) clusters. The ionization energies for KnCl+ and KnCln?1+ clusters are much lower than the 4.34 eV of the potassium atom; hence, these clusters should be classified as ‘superalkali’ species. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
3.
Rodica Olar Michaela Badea E. Cristurean C. Parnau D. Marinescu 《Journal of Thermal Analysis and Calorimetry》2006,84(1):53-58
The complexes of the type M(HDMBG)2(CH3COO)2·nH2O ((1)
M:Mn, n=1.5; (2)
M:Ni, n=0; (3)
M:Cu, n=2; (4)
M:Zn, n=2; DMBG: N,N-dimethylbiguanide)
present in vitro antimicrobial activity. The thermal analysis has evidenced
the thermal intervals of stability and also the thermodynamics effects that
accompany them. The different nature of the ligands generates a different
thermal behaviour for the complexes. The thermal transformations are complex
processes according to TG and DTG curves including dehydration, oxidative
condensation of –C=N– units as well as thermolysis processes.
The final products of decomposition are the most stable metal oxides. 相似文献
4.
Hydrated methanesulfonates Ln(CH3SO3)3·nH2O (Ln=La, Ce, Pr, Nd and Yb) and Zn(CH3SO3)2·nH2O were synthesized. The effect of atmosphere on thermal decomposition products of these methanesulfonates was investigated.
Thermal decomposition products in air atmosphere of these compounds were characterized by infrared spectrometry, the content
of metallic ion in thermal decomposition products were determined by complexometric titration. The results show that the thermal
decomposition atmosphere has evident effect on decomposition products of hydrated La(III), Pr(III) and Nd(III) methanesulfonates,
and no effect on that of hydrated Ce(III), Yb(III) and Zn(II) methanesulfonates.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
5.
Synthesis,Structures, and Luminescent Properties of Three Alkaline Earth Metal‐based MOFs Assembled from 3‐(3‐Carboxyphenoxy) Phthalic Acid Ligand
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Three two‐dimensional (2D) coordination complexes, namely [Ca2(HL)2(H2O)5]n · 2nH2O ( 1 ), [Sr(HL)(H2O)3]n · nH2O ( 2 ), and [Ba(HL)(H2O)3]n · nH2O ( 3 ) [H3L = 3‐(3‐carboxy‐phenoxy) phthalic acid], were synthesized by using the ligand H3L and alkaline earth metals. Structural analysis reveals that the structures of complexes 1 – 3 can be described as 2D networks with the point (Schälfli) symbol for net: {312 · 414 · 52} topology. Additionally, the thermal stability and solid‐state luminescent properties of compounds 1 – 3 were investigated at room temperature. The quantum yield (QY) of compound 2 is 10.75 %, which is much higher than the QY of the free H3L ligand (QYH3L < 1 %). 相似文献
6.
《Journal of Coordination Chemistry》2012,65(24):4254-4263
The self-assembly reaction of 1,4-bis(1,2,4-triazol-1-yl)butane (btb) and Ni(II) salts gives three coordination polymers {[Ni(btb)2(NCS)2]?·?H2O} n (1), [Ni(btb)2(NCO)2] n (2), and [Ni(btb)2Cl2] n (3). Compound 1 is comprised of a twofold interpenetrating 4-connected 65?·?8-CdSO4 3-D coordination network. Compounds 2 and 3 are neutral 2-D (4,4) networks with the ABAB?···?and ABCABC?···?stacking modes, respectively. The thermal stabilities of 1–3 were investigated. 相似文献
7.
Three copper(II) coordination polymers [Cu(mbtz)2(NCS)2]n ( 1 ), [Cu(mbtz)2Cl2]n ( 2 ) and [Cu(mbtz)(btec)0.5]n ( 3 ) (mbtz=1,3‐bis(1,2,4‐triazol‐1‐ylmethyl)benzene, btec=1,2,4,5‐benzenetetracarboxylate) were synthesized. In 1 and 2 , two mbtz ligands are wrapped around each other and are held together by Cu(II) atoms to form one‐dimensional double chain. In 3 , each btec ligand connects four Cu(II) atoms through its four carboxylate groups, resulting in a planar two‐dimensional [Cu(btec)0.5]n network. The Cu(II) atoms are further coordinated mbtz ligands to fulfil their coordination geometry and construct new [Cu(btec)0.5(mbtz)]n network. 2 and 3 further form the three‐dimensional network through the π···π stacking interactions between the mbtz ligands. The thermal stabilities of 1 , 2 and 3 were measured. 相似文献
8.
The 1,10-phenanthroline (phen) complexes of Co(II), Ni(II), Cu(II) and
Cd(II) orotates were synthesized and characterized by elemental analysis,
magnetic susceptibility, spectral methods (UV-vis and FTIR) and thermal analysis
techniques (TG, DTG and DTA). The Co(II), Ni(II), Cu(II) and Cd(II) ions in
diaquabis(1,10-phenanthroline)metal(II) diorotate octahedral complexes [M(H2O)2(phen)2](H2Or)2·nH2O
(M=Co(II), n=2.25; Ni(II), n=3;
Cu(II) and Cd(II), n=2) are coordinated
by two aqua ligands and two moles of phen molecules as chelating ligands through
their two nitrogen atoms. The monoanionic orotate behaves as a counter ion
in the complexes. On the basis of the first DTGmax,
the thermal stability of the hydrated complexes follows the order: Cd(II),
68°C 68°C 相似文献
9.
R. Olar M. Badea N. Stanica E. Cristurean D. Marinescu 《Journal of Thermal Analysis and Calorimetry》2005,82(2):417-422
Summary The investigations concerning the thermal behaviour of a series of Ni(II) and Cu(II) complexes of type [MLCln]·mH2O ((1) M:Ni, L:L(1), n=1, m=2; (2) M:Cu, L:L(2), n=1, m=2; (3) M:Ni, L:L(3), n=2, m=0; (4) M:Cu, L:L(3), n=1, m=2) are presented in this paper. The ligands L(1)-L(3) have been synthesised by template condensation of 1,2-diaminoethane
with formaldehyde and 2-amino-1,3,4-thiadiazole-5-thiole or 2-acetamino-1,3,4-thiadiazole-5-sulfonamide. The bonding and stereochemistry
of the complexes have been characterised by IR, electronic and magnetic studies at room temperature. The thermal behaviour
provided confirmation of the complex composition as well as the number and the nature of water molecules and the intervals
of thermal stability. The different nature of the ligands and/or the metallic ions generates a different thermal behaviour
for complexes. The complexes do not show biological activity against HIV virus. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(15):2623-2633
Nanoparticles of a Zn(II) coordination polymer {[Zn(DADMBTZ)(CH3COO)2] n , DADMBTZ?=?2,2′-diamino-5,5′-dimethyl-4,4′-bithiazole} were synthesized by reaction of Zn(NO3)2?·?4H2O, CH3COONH4 and DADMBTZ by a sonochemical method. The nanoparticles were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. [Zn(DADMBTZ)(CH3COO)2] n was structurally characterized by single-crystal X-ray diffraction. In this four-coordinate compound with nearly C2 symmetry, DADMBTZ is bidentate. The metal lies in a pseudo-tetrahedral environment and is ligated by the two bithiazole ring nitrogen atoms and an oxygen from each of the two monodentate acetates; 2-D networks are formed via N–H···O hydrogen bonds. Thermal stability of [Zn(DADMBTZ)(CH3COO)2] n was studied by thermal gravimetric and differential thermal analyses. A ZnO nanostructure was obtained by direct thermolyses at 500°C under air. The ZnO nanostructure was characterized by SEM, XRD, and FT-IR spectroscopy. 相似文献
11.
Transition
metal complexes of heterocyclic Schiff base 总被引:1,自引:0,他引:1
M. M. Omar G. G. Mohamed A. M. M. Hindy 《Journal of Thermal Analysis and Calorimetry》2006,86(2):315-325
Metal complexes of Schiff base derived from
2-furancarboxaldehyde and 2-aminobenzoic acid (HL) are reported and characterized
based on elemental analyses, IR, 1H NMR, UV-Vis,
solid reflectance, magnetic moment, molar conductance and thermal analysis.
The ligand dissociation as well as the metal-ligand stability constants have
been calculated pH-metrically at 25°C and ionic strength μ=0.1 (1 M
NaCl). The complexes are found to have the formulae [M(HL)2](X)n·yH2O
(where M=Fe(III) (X=Cl, n=3, y=4), Co(II)
(X=Cl, n=y=2), Ni(II) (X=Cl, n=y=2), Cu(II)
(X=Cl, n=y=2) and Zn(II) (X=AcO, n=y=2)) and [UO2(L)2]·2H2O. The thermal behaviour of these chelates is studied and the
activation thermodynamic parameters are calculated using Coats-Redfern method.
The ligand and its metal complexes show a biological activity against some
bacterial species. 相似文献
12.
The thermal dehydration-decomposition of Ln2(SeO4)3·nH2O (wheren=12 forLn=Pr, Nd andn=8 forLn=Sm) and PrxLn2−x(SeO4)3·nH2O (wheren=12 forx=1.0 andLn=Nd;n=8 forx=0.2 and 1.0 in case ofLn=Sm) have been reported.
Zusammenfassung Die thermische Dehydratation-Zersetzung von Ln2(SeO4)3·nH2O (mitn=12 fürLn=Pr, Nd undn=8 fürLn=Sm) und PrxLn2−x(SeO4)3·nH2O (mitn=12 fürx=1.0 undLn=Nd;n=8 fürx=0.2 und 1.0 in Falle vonLn=Sm) wurde beschrieben.相似文献
13.
Zuzana Bujdošová Katarína Györyová Daniela Hudecová Jana Kovářová Ladislav Halás 《Chemical Papers》2010,64(5):584-591
New zinc(II) 4-chloro- and 5-chlorosalicylate complex compounds of the general formula ((4- or 5-Cl)C6H3(2-OH)COO)2Zn · L
n
(where L = methyl 3-pyridylcarbamate, phenazone; n = 2, 4) were prepared and characterized by elemental analysis, thermal analysis (TG/DTG, DTA), and IR spectroscopy. During
thermal decomposition, mpc, phen, chlorosalicylic acid, chlorophenol, carbon dioxide, and carbon monoxide were released. Volatile
products of the thermal decomposition were confirmed by mass spectrometry. The final solid product of the thermal decomposition
up to 700°C was zinc oxide or metallic zinc. Antimicrobial activity of the compounds prepared was tested against various strains
of bacteria, yeasts and filamentous fungi. The highest antimicrobial effect was determined against the G+ bacteria S. aureus. 相似文献
14.
The gas-phase thermal decomposition rate of peroxy-n-butyryl nitrate (n-C3H7C(O)OONO2, PnBN) has been measured at ambient temperature (296 K) and 1 atm of air relative to that of peroxyacetyl nitrate (CH3C(O)OONO2, PAN) using mixtures of PAN (14–19 ppb), PnBN (22–46 ppb), and nitric oxide (1.35–1.90 ppm). The PnBN/PAN decomposition rate ratio was 0.773 ± 0.030. This ratio, together with a literature value of 3.0 × 10?4 s?1 for the thermal decomposition rate of PAN at 296 K, yields a PnBN thermal decomposition rate of (2.32 ± 0.09) × 10?4 s?1. The results are briefly discussed by comparison with data for other peroxyacyl nitrates and with respect to the atmospheric persistence of PnBN. © 1994 John Wiley & Sons, Inc. 相似文献
15.
S. R. Veličković J. B. Đustebek F. M. Veljković M. V. Veljković 《Journal of mass spectrometry : JMS》2012,47(5):627-631
Clusters of the type LinX (X = halides) can be considered as potential building blocks of cluster‐assembly materials. In this work, LinBr (n = 2–7) clusters were obtained by a thermal ionization source of modified design and selected by a magnetic sector mass spectrometer. Positive ions of the LinBr (n = 4–7) cluster were detected for the first time. The order of ion intensities was Li2Br+ > Li4Br+ > Li5Br+ > Li6Br+ > Li3Br+. The ionization energies (IEs) were measured and found to be 3.95 ± 0.20 eV for Li2Br, 3.92 ± 0.20 eV for Li3Br, 3.93 ± 0.20 eV for Li4Br, 4.08 ± 0.20 eV for Li5Br, 4.14 ± 0.20 eV for Li6Br and 4.19 ± 0.20 eV for Li7Br. All of these clusters have a much lower ionization potential than that of the lithium atom, so they belong to the superalkali class. The IEs of LinBr (n = 2–4) are slightly lower than those in the corresponding small Lin or LinH clusters, whereas the IEs of LinBr are very similar to those of Lin or LinH for n = 5 and 6. The thermal ionization source of modified design is an important means for simultaneously obtaining and measuring the IEs of LinBr (n = 2–7) clusters (because their ions are thermodynamically stable with respect to the loss of lithium atoms in the gas phase) and increasingly contributes toward the development of clusters for practical applications. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
16.
Mihaela Badea Rodica Olar Dana Marinescu Gina Vasile 《Journal of Thermal Analysis and Calorimetry》2008,92(1):209-214
A series of new complexes with mixed ligands of the type [ML(C3H3O2)2]·nH2O (((1)
M=Mn, n=1; (2)
M=Co(II), n=2; (3)
M=Ni(II), n=4; (4)
M=Cu(II), n=1.5; (5)
M=Zn(II), n=0; L=3-amino-1,2,4-triazole and (C3H3O2)=acrylate anion) were synthesized and characterised by chemical analysis and IR data. In all complexes the 3-amino-1,2,4-triazole
acts as bridge while the acrylate acts as bidentate ligand except for complex (5) where it is found as unidentate. The thermal behaviour steps were investigated in nitrogen flow. The thermal transformations
are complex processes according to TG and DTG curves including dehydration, acrylate ion and 3-amino-1,2,4-triazole degradation
respectively. The final products of decomposition are the most stable metal oxides, except for complex (4) that leads to metallic copper. 相似文献
17.
Jan Boeckmann Thorben Reinert Inke Jeß Prof. Dr. Christian Näther 《无机化学与普通化学杂志》2011,637(9):1137-1144
Reaction of ZnII and CdII thiocyanate or selenocyanate with pyrazine leads to the formation of new ZnII and CdII coordination compounds. The structures of [Zn(NCSe)2(pyrazine)2]n ( 1A ), [Cd(NCS)2(pyrazine)2]n ( 2A ) and [Cd(NCSe)2(pyrazine)2]n ( 3A ) consist of octahedrally coordinated metal cations which are surrounded by two terminal N‐bonded anions and two μ2‐bridging pyrazine molecules. The metal cations are connected via the pyrazine ligands into layers, which are further linked by weak intermolecular S···S respectively Se···Se interactions. Investigations on the thermal degradation behavior of 1A , 2A , and 3A using simultaneous differential thermoanalysis and thermogravimetry as well as X‐ray powder diffraction, IR‐ and Raman spectroscopy prove that on heating, the pyrazine‐rich compound 1A decomposes in one step into zinc selenocyanate without the formation of a pyrazine‐deficient intermediate. In contrast, for compounds 2A and 3A a stepwise decomposition is observed, leading to the formation of the pyrazine‐deficient compounds [Cd(NCS)2(pyrazine)]n ( 2B‐I and 2B‐II ) and [Cd(NCSe)2(pyrazine)]n ( 3B ) as intermediates. The structures and the thermal reactivity are discussed and compared with that of related transition metal thiocyanates and selenocyanates with pyridine as N‐donor ligand. 相似文献
18.
《Journal of Coordination Chemistry》2012,65(4):645-654
Metal complexes of omeprazole (OPZ) are prepared and characterized based on elemental analyses, IR, diffuse reflectance, magnetic moment, molar conductance and thermal analyses (TGA and DTA) techniques. From the elemental analyses, the complexes have the general formula [M(L)2]X n [where M = Cr(III) (X = Cl, n = 3), Ni(II) (X = ClO4, n = 2) and Zn(II) (X = Cl, n = 2)], and [M(L)2(H2O)2]X n · yH2O (where M = Fe(III) (X = Cl, n = 3, y = 0), Co(II) (X = Cl or ClO4, n = 2, y = 0–4) and Ni(II) (X = Cl, n = 2, y = 4) and [Cu(L)2]Cl2 · H2O. The molar conductance data reveal that all the metal chelates are 3 : 1 electrolytes (for Cr(III) and Fe(III) complexes) and 2 : 1 (for the remaining complexes). IR spectra show that OPZ coordinates to the metal ions as neutral bidentate with ON donor sites of the pyridine–N and sulphone-O. The magnetic and solid reflectance spectra indicate octahedral (FeCl3, CoCl2, CoClO4 and NiCl2), square planar [Cu(II)] and tetrahedral [Mn(II), Cr(III), NiClO4 and Zn(II)] structures. The thermal behavior of these chelates using thermogravimetric and differential thermal analyses (TGA and DTA) techniques indicate the hydrated complexes lose water of hydration followed immediately by decomposition of the anions and ligand molecules in the successive overlapping OPZ and its metal complexes are screened for antibacterial activity against Escherichia coli, Staphylococcus aureus, Aspergillus flavus and fungi (Candida albicans). The activity data show the metal complexes to be more potent/antibacterial than the parent OPZ ligand against one or more bacterial species. 相似文献
19.
Summary Complexes of heavy lanthanide(III) (Gd-Lu) and Y(III) with 4-chlorophthalic acid were prepared and their IR spectra, solubility
in water at 295 K and thermal decomposition were investigated. When heated the complexes with general formula Ln2[ClC6H3(CO2)2]3·nH2O where n=6 for Tb, Dy(III), n=4 for Gd, Ho and Er(III), n=2 for Tm-Lu(III) and n=3 for Y(III) decompose to the oxides Ln2O3, Tb4O7 with intermediate formation of oxochlorides LnOCl. 相似文献
20.
L. I. Kuznetsova A. V. Kazbanova Yu. L. Mikhlin A. M. Zhizhaev P. N. Kuznetsov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(11):1939-1944
The effect of Mn cations on the structural properties of zirconium dioxide (phase composition and crystallite size) was studied.
The cations were introduced by coprecipitation of hydroxide precursors followed by thermal processing at temperatures of 350
to 650°C. It was found by X-ray photoelectron spectroscopy that Mn
n+ cations (4 ≥ n ≥ 2, n = 3 being the dominant state) were localized on the surface of MnO
x
-ZrO2 samples calcinated at 350 and 600°C. 相似文献