共查询到20条相似文献,搜索用时 15 毫秒
1.
Senem Karahan Pelin Kose Elif Subasi Huseyin Alp Hamdi Temel 《Transition Metal Chemistry》2008,33(7):849-854
The hitherto unknown complexes, [M2(CO)6(μ-CO)(μ-L)], [M = Cr; 1, Mo; 2, W; 3] and [M2(CO)6(μ-CO)(μ-L′)], [M = Cr; 4, Mo; 5, W; 6] have been synthesized by the photochemical reactions of photogenerated intermediate, M(CO)5THF (M = Cr, Mo, W) with thio Schiff base ligands, N,N′-bis(2-aminothiophenol)-1,4-bis(2-carboxaldehydephenoxy)butane (H
2
L) and N,N′-bis(2-aminothiophenol)-1,7-bis(2-formylphenyl)-1,4,7-trioxaheptane (H
2
L′). The complexes have been characterized by elemental analysis, LC-mass spectrometry, magnetic studies, FT-IR and 1H NMR spectroscopy. The spectroscopic studies show that H
2
L and H
2
L′ ligands are converted to benzothiazole derivatives, L and L′ after UV irradiation and coordinated to the central metal as bridging ligands via the central azomethine nitrogen and sulphur
atoms in 1–6. 相似文献
2.
D. Czakis-Sulikowska A. Czylkowska J. Radwańska-Doczekalska R. Grodzki E. Wojciechowska 《Journal of Thermal Analysis and Calorimetry》2007,90(2):557-564
New mixed-ligands complexes with empirical formulae: M(2,4′-bpy)2L2·H2O (M(II)Zn, Cd), Zn(2-bpy)3L2·4H2O, Cd(2-bpy)2L2·3H2O, M(phen)L2·2H2O (where M(II)=Mn, Ni, Zn, Cd; 2,4′-bpy=2,4′-bipyridine, 2-bpy=2,2′-bipyridine, phen=1,10-phenanthroline, L=HCOO−) were prepared in pure solid state. They were characterized by chemical, thermal and X-ray powder diffraction analysis, IR
spectroscopy, molar conductance in MeOH, DMF and DMSO. Examinations of OCO− absorption bands suggest versatile coordination behaviour of obtained complexes. The 2,4′-bpy acts as monodentate ligand; 2-bpy and phen as chelating ligands. Thermal studies were performed in static air atmosphere. When the temperature raised the dehydration
processes started. The final decomposition products, namely MO (Ni, Zn, Cd) and Mn3O4, were identified by X-ray diffraction. 相似文献
3.
Mohamad Jaber Al-Jeboori Hasan Ahmad Hasan Worood A. Jaafer Al-Sa’idy 《Transition Metal Chemistry》2009,34(6):593-598
The new multidentate Schiff-base (E)-6,6′-((1E,1′E)-(ethane-1,2-diylbis(azan-1-yl-1-ylidene))bis(methan-1-yl-ylidene))bis(4-methyl-2-((E)(pyridine-2-ylmethylimino)methyl)phenol) H2L and its polymeric binuclear metal complexes with Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II)
are reported. The reaction of 2,6-diformyl-4-methyl-phenol with ethylenediamine in mole ratios of 2:1 gave the precursor 3,3′-(1E,1′E)-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis(methan-1-yl-1-ylidene)bis(2-hydroxy-5-methylbenzaldehyde) W. Condensation of the precursor with 2-(amino-methyl)pyridine in mole ratios of 1:2 gave
the new N6O2 multidentate Schiff-base ligand H2L. Upon complex formation, the ligand behaves as a dibasic octadentate species with the involvement of the nitrogen atoms
of the pyridine groups in coordination for all complexes. The mode of bonding and overall geometry of the complexes were determined
through physico-chemical and spectroscopic methods. These studies revealed octahedral geometries for Cr(III), Mn(II), Fe(II),
Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) complexes of general formulae [Cr2III(L)Cl2]Cl2, [Ni2II(L)(H2O)2]Cl2 and [M2(L)Cl2] and five co-ordinate Zn(II) complex of general formula [Zn2II(L)]Cl2. 相似文献
4.
A. I. El-Said 《Journal of Thermal Analysis and Calorimetry》2002,68(3):917-929
Several new mixed ligand complexes of Ni(II) and Co(II) of p-tolylsalicylaldimine (Sal-TH) or p-anisylsalicylaldimine (Sal-AH) with 8-hydroxyquinoline (HOx), benzohydroxamic acid (BH2) or α-picoline (α-pic) have been synthesized. The complexes have the general formulae: [M(Sal-T)L],[M(Sal-A)L]⋅H2O or [Ni(Sal-T)2(α-pic)2]⋅H2O where M=Ni(II) or Co(II), Sal-T=p-tolylsalicylaldiminate, Sal-A=p-anisylsalicylaldiminate, L=8-hydroxyquinolinate or benzohydroxamate and α-pic=α-picoline. Analytical, conductivity and spectral data support a square planar structure for Co(II) complexes and octahedral
structure for Ni(II) complexes. The thermal behaviour of the complexes has been studied by TG and DTG techniques. It was proposed
that the decomposition of the complexed Schiff base takes place via a radical mechanism while for 8-hydroxyquinolinate or
benzohydroxamate via proton transfer. Kinetic parameters of the thermal decomposition process have been computed by means
of Coats-Redfern and Horowitz-Metzger methods.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
5.
K. Shivakumar S. Shashidhar M. B. Halli 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(10):1681-1687
The proton dissociation constant of the ligand and the stability of the complexes of Co(II), Ni(II), Zn(II), Cd(II), Hg(II),
Pb(II), Cu(II), Ba(II), Mg(II), Mn(II), Th(IV), and UO2(II) ions with 2-phenyl-3-(2′-hydroxy-5′-benzylidine)-quinazoline-4-(3H)-one [PBQ] were determined potentiometrically at 30
± 0.1°C and ionic strengths of 0.025, 0.05, 0.10, 0.15 and 0.20 M NaNO3 in a 60:40 (v/v) ethanol-water medium. The proton-ligand and metal-ligand stability constants of the complexes were determined
pH metrically by the Calvin-Bjerrum titration technique. The order of stability constants obeys the Irving-Rossotti rule.
The negative values of ΔG° suggest that the reactions are spontaneous.
The article is published in the original. 相似文献
6.
Valiollah Mirkhani Reza Kia Akbar Rostami Vartooni Dalibor Milic 《Transition Metal Chemistry》2009,34(2):225-230
fac-[Re(CO)3(2-nben)Cl] and fac-[Re(CO)3(4-nbzen)Cl] complexes consisting of 2-nbzen = N,N′-bis(2-nitrobenzaldehyde)-1,2-diiminoethane and 4-nbzen = N,N′-bis(4-nitrobenzaldehyde)-1,2-diiminoethane were synthesized by the reaction of Re(CO)5Cl with nbzen ligands. These complexes were characterized by physico-chemical, spectroscopic methods and X-ray crystallography.
The electrochemical behavior of the two complexes was investigated by cyclic voltammetry. In the crystal structure of [Re(CO)3(4-nbzen)Cl], the neighbouring molecules are linked together by intermolecular C–H···Cl interactions to form 1D extended chains
along the b-axis.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
7.
An interesting series of cobalt(II) complexes of the new ligands: 4[N-(benzalidene)amino]antipyrinethiosemicarbazone (BAAPTS), 4[N-(2′-hydroxy-benzalidene)amino]antipyrinethiosemicarbazone (HBAAPTS) and 4[N-(2′-hydroxy-1′-naphthalidene)amino]antipyrinethiosemicarbazone (HNAAPTS) were synthesized by reaction with Co(II) salts in
ethanol. The general stoichiometry of the complexes was found to be [CoX2(H2O)(L)] and [Co(L)2](ClO4)2, where X = Cl, NO3, NCS or CH3COO and L = BAAPTS, HBAAPTS or HNAAPTS. The complexes were characterized by elemental analysis, molar conductivity measurement,
molecular weight determination, magnetic moments at room temperature, infrared and electronic spectra. All the thiosemicarbazones
behave as neutral tridentate (N, N, S) donor ligands. The conductivity measurements in PhNO2 solution indicated that the chloro, nitrato, thiocyanato and acetate complexes are essentially non-electrolytes, while the
perchlorate complexes are 1:2 electrolytes. Thermogravimetric studies were performed for some representative complexes and
the decomposition mechanism proposed. Antibacterial and antifungal properties of the ligands and their cobalt(II) complexes
have also been examined and it has been observed that the complexes are more potent bactericides than the ligand. 相似文献
8.
Seikh Jasimuddin 《Transition Metal Chemistry》2006,31(6):724-729
Dechlorination of M(RaaiR′)
n
Cl2 by AgNO3 produced [M(RaaiR′)
n
(MeCN)2]+2 [M = Ru(II), n = 2; Pt(II), n = 1; RaaiR′ = 1-alkyl-2-(arylazo)imidazole)] which upon reaction with the nucleobase cytosine (C) in MeCN solution gave cytosinato
bridged dimeric compounds which were isolated as perchlorate salts [M2(RaaiR′)
n
(C)2](ClO4)2 · H2O. The products were characterized by IR, u.v.–vis., 1H-n.m.r. spectroscopy and cyclic voltammetry. In MeCN solution the ruthenium complexes exhibit a strong MLCT band at 550–555 nm
and two redox couples positive to SCE due to two metal-center oxidation along with ligand reduction, negative to SCE. The
platinum complexes show a weak transition at 500–520 nm in MeCN and exhibit only ligand reduction in cyclic voltammetry. The
coordination of the ligand was supported by 1H-n.m.r. spectral data. 相似文献
9.
Rui-Hao Yu Yong-Jun Zheng Yan-Tuan Li Zhi-Yong Wu Cui-Wei Yan 《Transition Metal Chemistry》2012,37(4):399-406
Two complexes of general formula, [M(DABTA)]NO3 [M = CuII
(1) or NiII
(2), DABTA = N,N′-(4,4′-bithiazole-2,2′-diyl)diacetimidamide], have been synthesized and characterized by elemental analyses, molar conductivity
measurements, IR and electronic spectra studies and single-crystal X-ray diffraction. The crystal structures show that the
two complexes have similar molecular structures in which each metal atom has a square-planar coordination environment. Hydrogen
bonding interactions link each complex into a 2-D infinite network. The DNA-binding properties and cytotoxicities of the complexes
were investigated. The results suggest that the two complexes can interact with DNA by intercalation, with binding affinities
following the order of 1 > 2, which is consistent with their in vitro cytotoxicities. 相似文献
10.
Santanu Mandal Ashok Kumar Rout Guillaume Pilet Debasis Bandyopadhyay 《Transition Metal Chemistry》2009,34(7):719-724
Two new mononuclear complexes of copper(II), namely [CuL2] (1) and [CuL′2] (2) have been synthesized by reacting copper perchlorate with furfurylamine and salicylaldehyde or 2-hydroxyacetophenone, where
L = (2-hydroxybenzyl-2-furylmethyl)imine and L′ = (2-hydroxymethylbenzyl-2-furylmethyl)imine, the respective asymmetric bidentate
Schiff bases that are formed in situ to bind the Cu(II) ion. The complexes have been characterized by elemental analysis,
IR spectroscopy and single crystal X-ray diffraction studies. Structural studies reveal that the mononuclear units of both
the complexes (1) and (2) adopt square planar geometry supported by weak intermolecular C–H···π interactions. 相似文献
11.
Complexes [Pd(bt)(4,4′-bpy)OOCCH3], [Pd(bt)NO3]2(m-4,4′-bpy), [Pd(bt)(m-4,4′-bpy)]4(NO3)4 (bt− is deprotonated form of 2-phenylbenzothiazole, bpy is 4,4′-bipyridyl) are prepared and characterized by 1H NMR, electron absorption and emission spectroscopy, as well as by voltammetry. The upfield shift of the signal of proton
in the ortho-position to the donor carbon atom of the cyclopalladated ligand in the complexes [(Δδ = −(1.1–1.5) ppm] is assigned to the
anisotropic effect of the ring current of the pyridine rings of the 4,4′-bipyridyl moiety, which are orthogonal to the coordination
plane. Characteristic longwave absorption bands λ = (387±4) nm and the low-temperature phosphorescence bands λ = (512±3) nm
in the complexes are assigned to the chromophore {Pd(bt)} metal complex fragment. The reduction waves in the complexes [E
1/2 = −(1.54±0.04) and E
p = −(1.83±0.03) V] are assigned to the ligand-centered processes of the successive electron transfer to the π* orbitals localized
predominantly on the coordinated pyridine components of the 4,4′-bipyridyl moiety. 相似文献
12.
The novel trinuclear copper(II) complexes [CuLCl]2[CuCl4](I) and [CuLBr]2[CuBr4] (II) (where L = N,N′-bis(furaldehyde) diethylenetriamine) were synthesized and structurally characterized by X-ray diffraction. They consist of sandwich
units. Both I and II crystallize isomorphously in the monoclinic space group P2/n and feature cation/anion/cation geometry. The novel trinuclear copper(II) complexes I and II shown to be stabilized by a
number of weak hydrogen bonds and intermolecular π-π stacking interactions.
The article is published in the original. 相似文献
13.
Prithwiraj Byabartta 《Transition Metal Chemistry》2005,30(7):804-813
Ag+ assisted aquation of blue cis-trans-cis-RuCl2(RaaiR′)2 (4–6) leads to the synthesis of solvento species, blue-violet cis-trans-cis-[Ru(OH2)2(RaaiR′)2](ClO4)2 [Raai R′=p-R-C6H4
N=N–C3H2–NN–1–R′, (1–3), abbreviated as N,N′-chelator, where N(imidazole) and N(azo) represent N and N′, respectively; R = H (a), OMe (b), NO2 (c) and R′ = Me (1/4/7/10), CH2CH3 (2/5/8/11), CH2Ph (3/6/9/12)] that have been reacted with NO2−in warm EtOH resulting in violet dinitro complexes of the type, Ru(NO2)2(RaaiR′)2 (7–9). The nitrite complexes are useful synthons of electrophilic nitrosyls, and on triturating the compounds, (7b–9b) with conc. HClO4 nitro-nitrosyl derivatives, [Ru(NO2)(NO)(OMeaaiR′)2](ClO4)2 (10b–12b) are isolated. The solution structure and stereoretentive transformation in each step have been established from 1H n.m.r. results. All the complexes exhibit strong MLCT transitions in the visible region. They are redox active and display
one metal-centred oxidation and successive ligand-based reductions. The redox potentials of Ru(III)/Ru(II) (E1/2M) of (10b–12b) are anodically shifted by ∼
∼0.2 V as compared to those of dinitro precursors, (7b–9b). The ν(NO) >1900 cm−1 strongly suggests the presence of linear Ru–NO bonding. The electrophilic behaviour of metal bound nitrosyl has been proved
in one case (12b) by reacting with a bicyclic ketone, camphor, containing an active methylene group and an arylhydrazone with an active methine
group, and the heteroleptic tris chelates thus formed have been characterised. 相似文献
14.
Summary The metal complexes of the type [M(SB)2(H2O)2] and [M(SB)2][where M = MnII, CoII, NiII or CuII, M = ZnII CdII, HgII and PbII and SBH = 2-(2-hydroxyacetophenone)imino-5-(p-anisyl)-1,3,4-oxadiazole] have been prepared and characterised by elemental analyses, thermal analyses, magnetic measurements, electronic and infrared spectral studies. The complexes [M(SB)2(H2O)2] possess octahedral structures, whereas complexes [M(SB)2] are tetrahedral. The crystal field parameters of the CoII and NiII complexes are also calculated. 相似文献
15.
Ravindra K. Mittal Madhup Chandra Arun K. Dey 《Monatshefte für Chemie / Chemical Monthly》1978,109(4):853-860
Metal complexation equilibria in the binary complexing systems of the typeM–L [M=Cu(II), Ni(II), Co(II), Zn(II), Cd(II), and UO2(VI);L=AZN=8-azaguanine] have been examined potentiometrically. The work has further been extended to investigating the ternary complexing systems of the typeM–A–L [A=2,2-bipyridine, 1,10-phenanthroline or nitrilotriacetic acid]. Measurements were done at 25°C and at an ionic strength of 0.1M (NaClO4) in 50% (v/v) aqueous ethanol medium. Stabilities of the ternary complexes as compared to those of the corresponding binary complexes ofAZN are also discussed.
Biologisch relevante Verbindungen als Liganden: Binäre und ternäre Komplexe von 5-Amino-7-hydroxy-triazolo[4,5-d]pyrimidin (8-Azaguanin) in Lösung
Zusammenfassung Es wurden Komplexierungsgleichgewichte vom binären TypM–L [M=Cu(II), Ni(II), Co(II), Zn(II), Cd(II) und UO2(VI);L=AZN=8-Azaguanin] potentiometrisch untersucht. Die Untersuchungen wurden auf ternäre Systeme vom TypM–A–L ausgedehnt [A=2,2-Bipyridin, 1,10-Phenanthrolin oder Nitrilotriessigsäure]. Die Messungen wurden bei 25°C bei Ionenstärken von 0,1M (NaClO4) in 50% wäßr. Ethanol durchgeführt. Die Stabilität der ternären Komplexe im Vergleich zu den entsprechenden binären wird diskutiert.相似文献
16.
Zhi Qiang Shi Ning Ning Ji Ren Gao Zhao Ji Kun Li Zhi Feng Li 《Structural chemistry》2011,22(1):225-233
Two new copper(II) complexes, [Cu(p-FBA)2(2,2′-bpy)]·(H2O) (1) and [Cu(p-FBA)(2,2′-bpy)2]·(p-FBA)2 (2) {p-FBA = p-fluorobenzoic acid, 2,2′-bpy = 2,2′-bipyridine} have been obtained from an identical starting mixture using temperature as
the only independent variable and characterized by X-ray single crystal diffraction as well as with infrared spectroscopy,
elemental analysis, and thermogravimetric analysis. The results reveal that 1 has 1D infinite chain structure formed by O–H···O hydrogen bonds, while 2 features a 0D structure. Additionally, there exist C–H···O hydrogen bonds and π–π stacking interactions in 1, forming 2D supramolecular structure. Furthermore, density functional theory (DFT) calculations of the structures, stabilities,
orbital energies, composition characteristics of some frontier molecular orbitals and Mulliken charge distributions of the
[Cu(p-FBA)2(2,2′-bpy)] of 1 and [Cu(p-FBA)(2,2′-bpy)2]+ cation of 2 were performed by means of Gaussian 03W package and taking B3LYP/lanl2dz basis set. 相似文献
17.
Wan-Yun Huang Zi-Lu Chen Kai Wang Xiang Zhou Fu-Pei Liang 《Transition Metal Chemistry》2012,37(3):291-296
Three isomorphous coordination polymers of general formula {[M(H2bna)·(DMF)2·(H2O)2]·DMF}n (M = Co for 1, Mn for 2, Ni for 3, respectively, where H4bna = 2,2′-dihydroxy-[1,1′]-binaphthalene-3,3′-dicarboxylate) were synthesized under solvothermal conditions and characterized
by FTIR, single crystal X-ray diffraction, thermogravimetric analysis, and X-ray power diffraction analysis. All three polymers
crystallize in the same monoclinic space group P21/n. The complexes are assembled into 1D helical chains, and each adjacent helical chain of the same chirality is further connected
to form a chiral layer by hydrogen bond interactions. The layers are packed in alternating left-(M) and right-handed (P) chirality arrays. Magnetic studies reveal the presence of antiferromagnetic coupling interactions in complexes 1 and 2. 相似文献
18.
S. Vidhisha Kotha Laxma Reddy K. Ashwini Kumar Yata Praveen Kumar S. Satyanarayana 《Transition Metal Chemistry》2010,35(8):1027-1034
This article describes the synthesis of a polypyridyl ligand, namely 2-(2, 5-dimethoxyphenyl)-1H-imidazo[4,5-f]1,10-phenanthroline (DMPIP) and its Ru(II) complexes, namely [Ru(bipy)2DMPIP]2+ (1), [Ru(dmb)2DMPIP]2+ (2) and [Ru(phen)2DMPIP]2+ (3) ((bipy = 2,2′-bipyridine, dmb = 4,4′-dimethyl-2,2′-bipyridine, phen = 1,10-phenanthroline). The complexes were characterized
by elemental analysis, plus IR, 1H-NMR and 13C [1H]-NMR spectra. The interactions of the complexes with calf thymus DNA were investigated. The results indicate that the three
complexes can intercalate into DNA. Under irradiation at 365 nm, all three complexes promote the photocleavage of plasmid
pBR 322 DNA. Inhibitor studies suggest that singlet oxygen plays a significant role in the cleavage mechanism for the complexes. 相似文献
19.
Wei Xu Dr. Karoly Kozma Tianxiang Sha Yi-Jen Wu Prof. May Nyman Prof. Michael M. Lerner 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(36):8101-8104
The alkaline earth metals (M=Mg, Ca, Sr, and Ba) exhibit a +2 oxidation state in nearly all known stable compounds, but MI dimeric complexes with M−M bonding, [M2(en)2]2+, (en=ethylenediamine) of all these metals can be stabilized within the galleries of donor-type graphite intercalation compounds (GICs). These metals can also form GICs with more conventional metal (II) ion complexes, [M(en)2]2+. Here, the facile interconversion between dimeric-MI and monomeric-MII intercalates upon the addition/removal of en are reported. Thermogravimetry, powder X-ray diffraction, and pair distribution function analysis of total scattering data support the presence of either [M2(en)2]2+ or [M(en)2]2+ guests. This phase conversion requires coupling graphene and metal redox centers, with associated reversible M−M bond formation within graphene galleries. This chemistry allows the facile isolation of unusual oxidation states, reveals M0→M2+ reaction pathways, and present new opportunities in the design of hybrid conversion/intercalation materials for applications such as charge storage. 相似文献
20.
Zidan A. S. A. El-Said A. I. El-Meligy M. S. Aly A. A. M. Mohammed O. F. 《Journal of Thermal Analysis and Calorimetry》2000,62(3):665-679
Ten mixed ligand complexes of the type [M(X-QA)(aa)] and [Ni(X-QA)2(Haa)(H2O)],where X-HQA=5-arylazo-8-hydroxyquinoline derivatives, M=Co(II) orCu(II) and Haa=glycine (gly), alanine (ala) or methionine (met), have been prepared. The complexes have been characterized by elemental
analysis, IR and electron spectra and thermal analysis. A tetrahedral structure has been proposed for the cobalt(II) and copper(II)
complexes with bidentate coordination of amino acids. The nickel(II) complexes have been assigned an octahedral structure
with the amino acids acting as monodentate ligands. The thermal behaviour of the complexes has been studied before and after
γ-irradiation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献