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1.
Two similar tetranuclear copper(II) complexes with the formulae [Cu4(L1)2(μ1,1-N3)4(μ2-CH3COO)2] and [Cu4(L2)2(μ1,1-N3)2(μ-Br)2Br2(CH3OH)2], where L1 and L2 are the deprotonated forms of 2-[(2-ethylaminoethylimino)methyl]-5-methoxyphenol and 5-methoxy-2-[(2-piperidin-1-ylethylimino)methyl]phenol,
respectively, have been synthesized and characterized by spectroscopic methods and single-crystal X-ray diffraction. Both
complexes are centrosymmetric tetranuclear copper(II) compounds. The bridging groups in [Cu4(L1)2(μ1,1-N3)4(μ2-CH3COO)2] are μ1,1-azide ligands and μ2-acetate ligands, and those in [Cu4(L2)2(μ1,1-N3)2(μ-Br)2Br2(CH3OH)2] are μ1,1-azide ligands and μ-bromide ligands. Each Cu atom in the complexes is in a square pyramidal geometry. 相似文献
2.
A new polymer azido-bridged copper(II) complex [Cu4(En)2(μ1,1-N3)4(μ1,1,1-N3)2(μ1,3-N3)2]
n
(I) (En = ethylenediamine) has been synthesized and crystallography characterized. Complex I shows one-dimensional coordination polymeric structure based on a tetranuclear cluster unit [Cu4(En)2(μ1,1-N3)4(μ1,1,1-N3)2(μ1,3-N3)2], in which the azido ions display three different bridging modes. 相似文献
3.
Ji-Cai Zhang Xiao-Shuang Zhou Xiao-Ling Wang Xiao-Fang Li Zhong-Lu You 《Transition Metal Chemistry》2011,36(1):93-98
Three azido-bridged copper(II) complexes, [Cu2(L1)2(μ1,1,3-N3)2]
n
·2nH2O (1), [Cu4(L2)4(μ1,1-N3)2(μ1,1,3-N3)2]
n
(2), and [Cu2(L3)2(μ1,1-N3)2] (3), where L1, L2, and L3 are the deprotonated forms of 4-bromo-2-[(2-methylaminoethylimino)methyl]phenol (HL1), 4-bromo-2-[(2-ethylaminoethylimino)methyl]phenol (HL2), and 4-bromo-2-[(2-isopropylaminoethylimino)methyl]phenol (HL3), respectively, have been prepared and structurally characterized by single-crystal X-ray diffraction analysis and IR spectra.
The slight differences in the terminal groups of the Schiff bases lead to different bridging modes of the azido groups. 相似文献
4.
A pair of azido-bridged Schiff base copper complexes, [CuL1(μ1,3-N3)]
n
· nClO4
(1) and [Cu2(L2)2(μ
1,1-N3)2] · 2ClO4
(2) (L1 = N,N-diethyl-N′-(1-pyridin-2-ylmethylidene)ethane-1,2-diamine, L2 = N-isopropyl-N′-(1-pyridin-2-ylmethylidene)ethane-1,2-diamine) have been obtained by the same synthetic procedures, but with slightly different
Schiff bases. The structures of the complexes have been characterized by IR spectra, elemental analysis, and single crystal
X-ray determination. Each Cu atom in the complexes is five-coordinate in a square pyramidal configuration involving the three
N atoms of the Schiff base ligand and two N atoms from two bridging azide ligands. The azide ligands adopt end-to-end bridging
mode in (1), and end-on bridging mode in (2). The different coordination modes of the azide ligands in the two complexes are assigned to the steric effects of the terminal
groups (two ethyl groups for (1) and one isopropyl group for (2)) in the Schiff base ligands. The urease inhibitory activities of the complexes were evaluated. Both of them showed potent
inhibition against jack bean urease.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
5.
S. Jalali Akerdi G. Grivani H. Stoeckli-Evans A. D. Khalaji 《Russian Journal of Coordination Chemistry》2011,37(5):394-398
New dinuclear copper(II)-azido complex [Cu2((3,4-MeO-Ba)2En)2(μ1,1-N3)2(N3)2] (I) ((3,4-MeO-Ba)2En = N,N′-bis(3,4-dimethoxybenzylidene)-1,2-diaminoethane) has been synthesized and characterized by elemental analyses, FT-IR
spectroscopy, and X-ray single-crystal diffraction. Complex I consists of a dinuclear unit that represents a new example of a copper(II)-azido compound and the Cu2+ ions are bridged by two azido ions in a double end-on fashion, consisting of two terminally bonded azido ligands. The Schiff
base ligand (3,4-MeO-Ba)2En is chelated by two imino nitrogen atoms. 相似文献
6.
Three novel compounds [Cu2(μ1,1-N3)2(N3)2(bdmpzm)2] (1) [Cd(N3)2(bdmpzm)]n (2) and [Ni(N3)2(bdmpzm)2] (3) have been synthesised and characterised structurally and spectroscopically. The structure 1 consists of a neutral dinuclear [Cu2(μ1,1-N3)2(N3)2(bdmpzm)2] entities, compound 2 has one-dimensional zigzag chain structure extending along the crystallographic direction [1 0 0] with alternating di-μ1,1-N3 and di-μ1,3-N3 bridges, and 3 is a mononuclear complex. The experimental studies on the nickel(II) complex have been accompanied computationally by the density functional theory (DFT) calculations. 相似文献
7.
An end-on azido-bridged dinuclear Cu(II) complex, [Cu2L2(μ1,1–N3)2]·CH3OH, and an end-on azido-bridged polynuclear Cu(II) complex, [CuL(μ1,1–N3)]n, derived from the Schiff base 2-[(3-methylaminopropylimino)methyl]phenol (HL), were synthesized and characterized by physico-chemical
and spectroscopic methods. The two complexes were synthesized and crystallized with different solvents, methanol for [Cu2L2(μ1,1–N3)2]·CH3OH and ethanol for [CuL(μ1,1–N3)]n. The Cu atom in each complex is five-coordinate in a square pyramidal geometry with one O and two N atoms of L, and one N
atom of an azide ligand defining the basal plane, and with one N atom of another azide ligand occupying the apical position.
The urease inhibitory activities of both complexes were evaluated. 相似文献
8.
Zou Jianzhong Wu Yong Duan Chunyin Liu Yongjiang Xu Zheng 《Transition Metal Chemistry》1998,23(3):305-308
Three binuclear copper(II) complexes bridged by three different bridging ligands: μ-TPHA (terephthalato), μ-PHTA (phthalato)
and μ-TCB (tetracarboxylatobenzene) have been synthesized. The crystal structure of [{Cu(dipn)}2(μ-TPHA)](ClO4)2 where dipn = N-(3-aminopropyl)-1,3-propanediamine was solved at room temperature. The [{Cudipn}2(μ-TPHA)](ClO4)2 complex consists of a μ-terephthalato bridging binuclear copper(II) cationic unit and two non-coordinated perchlorate anions.
The TPHA ligand bridges in a bismonodentate fashion. The environment of the copper(II) ion is a distorted plane-square-planar coordination sphere. The magnetic
properties of the three complexes have been investigated in the 75–300 K range, and show that the geometry of the CuII atom is the important factor for magnetic interactions in the terephthalato bridging binuclear copper(II) complexes.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
9.
Two end-on azido-bridged Co(III) complexes, [Co3(L1)2(μ1,1-N3)4(N3)2(OH2)(OCH2CH3)]·0.5H2O (1) and [Co2(L2)2(μ1,1-N3)2(N3)2] (2), where L1 and L2 are the deprotonated form of 5-methoxy-2-[(2-morpholin-4-ylethylimino)methyl]phenol and 2-ethoxy-6-[(2-isopropylaminoethylimino)methyl]phenol,
respectively, were prepared and structurally characterized by physicochemical and spectroscopic methods and single crystal
X-ray determination. Complex (1) is a trinuclear Co compound, while complex (2) is a centrosymmetric dinuclear Co compound.
In both complexes, the Co atoms are in octahedral coordination. The preliminary biological tests show that the complexes have
excellent antibacterial activity. 相似文献
10.
A novel one-dimensional manganese(II) complex containing nitronyl nitroxide radical [Mn2(IM2-py)2(Ac)2(μ1,1-N3)(μ1,3-N3) · EtOH]
n
was synthesized and characterized structurally and magnetically. It crystallizes in the monoclinic space group p21/n. Each Mn(II) ion is six-coordinated in a distorted octahedral environment. The two N atoms of the nitronyl nitroxide radical
and the two O atoms of acetate ligands are in the equatorial plane, whereas the two different azido bridging ligands are in
trans axial position. Mn(II) ions are linked by nitrogen atom of μ1,1-azido and oxygen atoms of two carboxy groups to form a Mn-Mn unit. Mn-Mn units are linked by azido ligands through μ1,3 bridging style to form a one-dimensional chain. The compound is connected by the coordination bonds, π-π interactions and
hydrogen bonds as a three-dimensional structure. Magnetic susceptibility data support that there are stronger antiferromagnetic
interactions between the radical and Mn(II) ion, weak antiferromagnetic interactions between the Mn-R units, and very weak
antiferromagnetic interactions between the R-Mn-Mn-R units. 相似文献
11.
Abstract Three new complexes, [Co(L)2(SCN)2] (1), [Co2(L)4(μ-N3)2](ClO4)2(H2O)1.5 (2), and [Ni(L)3](ClO4)2(CH3OH)2 (3), have been synthesized and structurally characterized, where L is 3-(3′,5′-dimethyl-pyrazole)-6-Cl-pyridazine. Single crystal
X-ray analyses show that all three complexes crystallize in the monoclinic crystal system. In complex (1), the Co(II) atom is in a distorted octahedral environment consisting of four nitrogen atoms from two ligands and two nitrogen
atoms of SCN−, which is further extended into a 1D chain by intermolecular hydrogen bonds. Two Co(II) atoms in complex (2) are linked by two azide anions in a μ-1,1 mode to make a binuclear structure. Without any auxiliary ligand, the Ni(II) atom
in complex (3) adopts a distorted octahedral geometry involving six nitrogen atoms from three ligands. The electronic absorption spectra
of the title compounds are discussed as well. The effects of auxiliary ligands on the structures and properties of the title
complexes have been studied and discussed.
Graphical Abstract Three new complexes, [Co(L)2(SCN)2] (1), [Co2(L)4(μ-N3)2](ClO4)(H2O)1.5 (2) and [Ni(L)3](ClO4)2(CH3OH)2 (3), have been synthesized and structurally characterized, where L is 3-(3′,5′-dimethyl-pyrazole)-6-Cl-pyridazine. Complexes
(1) and (3) are mononuclear compounds, which are different from the binuclear complex (2). Auxiliary ligands are the main reasons that results in the different structures of the title complexes and their different
fungicidal activities.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
12.
Zhong-Lu You Xiao-Ling Wang Ji-Cai Zhang Che Wang Xiao-Shuang Zhou 《Structural chemistry》2011,22(6):1297-1302
A new tridentate pyridyl Schiff base, N-isopropyl-N′-(1-pyridin-2-ylethylidene)ethane-1,2-diamine (L), was used to synthesize two dinuclear cadmium(II) complexes, [Cd2L2(μ
1,1-N3)2(N3)2] (1) and [Cd2L2(μ
1,3-NCS)2(NCS)2] (2). X-ray single crystal structure determination reveals that in both centrosymmetric complexes, the Cd atom is in a distorted
octahedral coordination. In the crystal structures of 1 and 2, the dinuclear cadmium(II) complex molecules are linked, respectively, through intermolecular N–H···N and N–H···S hydrogen
bonds to form infinite 1D chains. The preliminary fluorescence properties of the complexes were investigated. 相似文献
13.
《Journal of Coordination Chemistry》2012,65(18):3265-3272
Three new centrosymmetric dinuclear copper(II) complexes, [Cu2Cl2(L1)2] (1), [Cu2(μ 1,3-NCS)2(L2)2] (2), and [Cu2(μ 1,1-N3)2(L3)2] (3), where L1, L2, and L3 are the deprotonated forms of the Schiff bases 1-[(2-propylaminoethylimino)methyl]naphthalen-2-ol (HL1), 1-[(3-methylaminopropylimino)methyl]naphthalen-2-ol (HL2), and 2-[(2-isopropylaminoethylimino)methyl]phenol (HL3), respectively, have been prepared and characterized by elemental analysis, IR spectra, and single-crystal X-ray crystallography. Each Cu is coordinated by the three donors of the Schiff bases and by two bridging groups, forming a square-pyramidal geometry. 相似文献
14.
《Journal of Coordination Chemistry》2012,65(6):900-906
A new double asymmetric μ1,1-azido bridged binuclear copper(II) complex, [Cu2(μ1,1-N3)2(Him2-py)2(N3)2] (Him2-py?=?2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-hydroxy), has been synthesized and characterized structurally and magnetically. The crystal structure shows this complex is binuclear with copper(II) in a distorted square-pyramidal geometry, bridged by double asymmetric end-on azide ligands. The variable temperature magnetic susceptibility analyses reveal weak antiferromagnetic interaction mediated by the bridge. 相似文献
15.
Sujittra Youngme Thidarat Chotkhun Somying Leelasubcharoen Narongsak Chaichit Chaveng Pakawatchai Gerard A. van Albada Jan Reedijk 《Polyhedron》2007
Three new dinuclear copper(II) compounds: [Cu2(dpyam)2(μ1,1-N3)2(O2CH)2] (1), [Cu2(dpyam)2(μ1,1-N3)2(O2CCH3)2] (2) and [Cu2(dpyam)2(μ1,1-N3)2(O2CCH2CH3)2] (3) have been synthesized and characterized crystallographically and spectroscopically. Compounds 1, 2 and 3 consist of a dinuclear unit in which both Cu(II) ions are connected through two end-on azido bridges providing a distorted square pyramidal geometry with a CuN4O chromophore. The Cu?Cu separations are 3.195, 3.200 and 3.247 Å for compounds 1, 2 and 3, respectively. The magnetic properties have been measured in the range from 5 to 300 K and correlated with the molecular structures. All three compounds show a medium to weak ferromagnetic exchange interactions between the Cu(II) ions dominated by the bridging azido ligands, with a singlet-triplet splitting (J) of 63.3, 63.8 and 5.1 cm−1, for compounds 1, 2 and 3, respectively. A large zero-field splitting of about 0.4 cm−1 is observed in the EPR for compounds 1 and 2. 相似文献
16.
Peng Cheng Daizheng Liao Shiping Yan Zonghui Jiang Genglin Wang 《Transition Metal Chemistry》1996,21(6):515-518
Summary Four binuclear CuII complexes, [Cu2(L)(-X)], have been prepared and characterized, where H3L is a 2:1 Schiff base derived from 2-hydroxy-1-naphthaldehyde and 1,3-diamino-2-propanol and X = 1,3-N3
(1), C3H3N2 (pyrazolate) (2), AcO (3) and PhCO2
(4). The CuIIions are bridged by endogenous alkoxide and bidentate exogenous bridges. The variable-temperature magnetic analyses show that complexes (2)–(4) exhibit antiferro-magnetic coupling with the exchange integrals, 2J, from- 188 to -158 cm-1. The -1,3-azide-bridged binuclear CuII complex (1) shows the essential features of diamagnetism through measurements of its variable-temperature susceptibility and e.p.r. spectra. The results suggest that (1) can act as a diamagnetic model for metazidohemocyanin. 相似文献
17.
《Journal of Coordination Chemistry》2012,65(23):4080-4092
Four copper(II) complexes and one copper(I) complex with pyridine-containing pyridylalkylamide ligands N-(pyridin-2-ylmethyl)pyrazine-2-carboxamide (HLpz) and N-(2-(pyridin-2-yl)ethyl)pyrazine-2-carboxamide (HLpz?) were synthesized and characterized. The X-ray crystal structures of [Cu2(Lpz)2(4,4?-bipy)(OTf)2] (1, OTf?=?trifluoromethanesulfonate, 4,4?-bipy?=?4,4?-bipyridine) and [Cu(Lpz)(py)2]OTf·H2O (2, py?=?pyridine) revealed binuclear and mononuclear molecular species, respectively, while [Cu(Lpz)(μ2-1,1-N3)]n (3), [Cu(Lpz?)(μ2-1,3-N3)]n (4), and [Cu(HLpz)Cl]n (5) are coordination polymer 1-D chains in the solid state. 相似文献
18.
Shyamapada Shit Pritha Talukder Joy Chakraborty Guillaume Pilet M. Salah El Fallah Joan Ribas Samiran Mitra 《Polyhedron》2007
A new end-to-end (EE) doubly azido bridged dinuclear complex [Cu2L2(μ1,3-N3)2] (1) [where L = (E)-4-(2-(dimethylamino)ethylimino)-1,1,1-trifluoropentan-2-one)] has been synthesized and characterized by elemental and spectroscopic techniques. Single crystal X-ray diffraction analysis reveals that the dimeric complex possesses a center of inversion. Each copper atom in 1 is in a distorted square pyramidal geometry with a CuN4O chromophore as revealed from the τ value, 0.19. The four basal positions are occupied by two imine N and one keto O atom of the Schiff base and one N atom from the azide anion. Another N atom from a coordinated azide occupies the apical position. Temperature dependent magnetic susceptibility of 1 was fitted using the Bleaney–Bowers expression which led to the parameters J = 13.6 cm−1 and R = 3.4 × 10−5. It indicates a ferromagnetic interaction through the double azido bridges connecting the individual copper Schiff base units. 相似文献
19.
The reaction of salpnH2 Schiff-base ligand (salpnH2 = N,N′-bis(salicylidene)-1,3-propylenediamine) with Cu(NO3)2·3H2O and a large excess of NaN3 (1:2:8 molar ration), lead to the formation of [Cu4(μ-salpn)2(μ1,1-N3)2(N3)2(H2O)2] (1), which has been successfully obtained and characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction. The strong absorption band at about 2000–2100 cm?1 and at 1597 cm?1 regions of the IR spectrum of 1 clearly proves the presence of the both end-on (EO) bridging and terminal azido ions and CN (azomethine) groups, respectively. Single-crystal X-ray analyses revealed that the copper atoms are bridged alternately by end-to-on (EO) azido and phenoxo-salpn ligands in the prepared tetranuclear copper(II) complex [Cu4(μ-salpn)2(μ1,1-N3)2(N3)2(H2O)2] (1). 相似文献
20.
《Journal of Coordination Chemistry》2012,65(22):3573-3582
A new azido adduct of a tridentate Schiff-base copper(II) complex has been synthesized and characterized structurally and magnetically. X-ray single crystal structure analysis reveals that the asymmetric unit of [Cu2(L)2(µ1,1-N3)2][Cu(L)(N3)] (1) [HL = 1-(N-ortho-hydroxyacetophenimine)-2,2-diethyl-aminoethane] has two independent moieties. One of these forms a dimer, containing end-on azido bridges, with its center of inversion related equivalents. The complex crystallizes in monoclinic space group P21/c with a = 10.112(2), b = 31.938(4), c = 9.718(2) Å and β = 95.00(2)°. Variable temperature magnetic susceptibility data show antiferromagnetic interactions between copper(II) centers. 相似文献