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1.
One μ‐alkoxo‐μ‐carboxylato bridged dinuclear copper(II) complex, [Cu2(L1)(μ‐C6H5CO2)] ( 1 )(H3L1 = 1,3‐bis(salicylideneamino)‐2‐propanol)), and two μ‐alkoxo‐μ‐dicarboxylato doubly‐bridged tetranuclear copper(II) complexes, [Cu4(L1)2(μ‐C8H10O4)(DMF)2]·H2O ( 2 ) and [Cu4(L2)2(μ‐C5H6O4]·2H2O·2CH3CN ( 3 ) (H3L2 = 1,3‐bis(5‐bromo‐salicylideneamino)‐2‐propanol)) have been prepared and characterized. The single crystal X‐ray analysis shows that the structure of complex 1 is dimeric with two adjacent copper(II) atoms bridged by μ‐alkoxo‐μ‐carboxylato ligands where the Cu···Cu distances and Cu‐O(alkoxo)‐Cu angles are 3.5 11 Å and 132.8°, respectively. Complexes 2 and 3 consist of a μ‐alkoxo‐μ‐dicarboxylato doubly‐bridged tetranuclear Cu(II) complex with mean Cu‐Cu distances and Cu‐O‐Cu angles of 3.092 Å and 104.2° for 2 and 3.486 Å and 129.9° for 3 , respectively. Magnetic measurements reveal that 1 is strong antiferromagnetically coupled with 2J =‐210 cm?1 while 2 and 3 exhibit ferromagnetic coupling with 2J = 126 cm?1 and 82 cm?1 (averaged), respectively. The 2J values of 1–3 are correlated to dihedral angles and the Cu‐O‐Cu angles. Dependence of the pH at 25 °C on the reaction rate of oxidation of 3,5‐di‐tert‐butylcatechol (3,5‐DTBC) to the corresponding quinone (3,5‐DTBQ) catalyzed by 1–3 was studied. Complexes 1–3 exhibit catecholase‐like active at above pH 8 and 25 °C for oxidation of 3,5‐di‐tert‐butylcatechol. 相似文献
2.
《Journal of Coordination Chemistry》2012,65(9):1633-1643
The reactions of cyclohexenephosphonic acid (C6H9PO3H2) and 3-(2-pyridyl)pyrazole (2-pyPzH) with copper(II) chloride and copper(II) bromide affords a 1-D compound [Cu(2-pyPz)Cl] (1) and a decanuclear [Cu10(OH)4(C6H9PO3)6(2-pyPz)4] (2) cage complex. In 1, adjacent copper ions are bridged by two 2-pyPz ligands into dimers, which are further linked by Cl? into a ladder-like chain. Compound 2 has a decanuclear cage structure, the overall cage can be viewed as composed of two Cu4(OH)2(2-pyPz)2 wings that are bridged by a central Cu2P2O6 rim. Variable-temperature magnetic susceptibility studies indicate that both compounds show antiferromagnetic interactions between copper centers. 相似文献
3.
Zhi‐gang Wang Ying‐ying Kou Jing Lu Chun‐yan Gao Jin‐lei Tian Shi‐ping Yan 《应用有机金属化学》2012,26(10):511-517
A novel oxalato‐bridged copper(II) complex has been prepared and structurally characterized: [Cu(bpa)(μ‐C2O4)].H2O (bpa = bis(2‐pyridylmethyl) amine). In the complex, the copper ion is linked in an unusual μ1,2,3‐C2O42? bridging mode, generating one‐dimensional zigzag chain disposition. Variable‐temperature magnetic susceptibility studies (2–300 K) reveal a weak ferromagnetic coupling, J = 0.63 cm?1, between the copper ions. The interaction of the complex with CT‐DNA has been studied using UV–visible absorption and emission spectral methods, and the binding constant of the complex with CT‐DNA is Kapp = 9 × 104 m ?1, which indicates that the interaction of the complex with DNA is a moderate intercalative mode. Furthermore, the complex cleaves supercoiled plasmid DNA efficiently in the presence of hydrogen peroxide. The mechanistic investigations suggest that the hydroxyl radical and singlet oxygen are involved in the DNA degradation. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
4.
Qian-Jun Deng Min Chen Dong-Chu Chen Hang-Yu Long Chang-Ai Chen 《Acta Crystallographica. Section C, Structural Chemistry》2020,76(7):655-662
Methanol‐ and temperature‐induced dissolution–recrystallization structural transformation (DRST) was observed among two novel CuII complexes. This is first time that the combination of X‐ray crystallography, mass spectrometry and density functional theory (DFT) theoretical calculations has been used to describe the fragmentation and recombination of a mononuclear CuII complex at 60 °C in methanol to obtain a binuclear copper(II) complex. Combining time‐dependent high‐resolution electrospray mass spectrometry, we propose a possible mechanism for the conversion of bis(8‐methoxyquinoline‐κ2N,O)bis(thiocyanato‐κN)copper(II), [Cu(NCS)2(C10H9NO)2], Cu1 , to di‐μ‐methanolato‐κ4O:O‐bis[(8‐methoxyquinoline‐κ2N,O)(thiocyanato‐κN)copper(II)], [Cu2(CH3O)2(NCS)2(C10H9NO)2], Cu2 , viz. [Cu(SCN)2( L )2] ( Cu1 ) → [Cu( L )2] → [Cu( L )]/ L → [Cu2(CH3O)2(NCS)2( L )2] ( Cu2 ). We screened the antitumour activities of L (8‐methoxyquinoline), Cu1 and Cu2 and found that the antiproliferative effect of Cu2 on some tumour cells was much greater than that of L and Cu1 . 相似文献
5.
Hui‐Zhong Kou Song Gao Ru‐Ji Wang 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(6):m325-m326
A cyano‐bridged bimetallic 4f–3d complex, triaqua‐1κ3O‐μ‐cyano‐1:2κ2N:C‐pentacyano‐2κ5C‐tetrakis(2‐pyrrolidone‐1κO)chromium(III)dysprosium(III) dihydrate, [CrDy(C4H7NO)4(CN)6(H2O)3]·2H2O, has been prepared and characterized by X‐ray crystallographic analysis. The structure consists of a neutral cyano‐bridged Dy–Cr dimer. A hydrogen‐bonded three‐dimensional architecture is formed through N—H?O, O—H?N and O—H?O hydrogen bonds. 相似文献
6.
Abstract. The self‐assembly of glycyl‐L ‐leucine, Cu(NO3)2 · 3H2O and 4, 4′‐bipyridine resulted in the tetranuclear‐based metal‐dipeptide supramolecular framework [Cu4(C8H14N2O3)4(H2O)2(C10H8N2)2] · (C10H8N2) · 13H2O ( 1 ). In the structure, the 4, 4′‐bipyridine‐bridged tetranuclear complex of CuII‐glycyl‐L ‐leucine interacts with each other to form a 1D hydrogen‐bonded chain including uncoordinated 4, 4′‐bipyridine and an interesting water chain in different channels. Under similar reaction conditions, racemic glycyl‐D ,L ‐leucine gave rise to the centrosymmetric dinuclear complex [Cu2(C8H14N2O3)2(C10H8N2)] · 2H2O ( 2 ), which is linked into a 2D hydrogen‐bonded structure without 4, 4′‐bipyridine included. 相似文献
7.
A 3d‐4f Complex Constructed by the Assembly of a Cationic Template, [Cu(en)2]2+, and a 3D Anionic Coordination Polymer, [Sm2(C2O4)3(C5O5)(H2O)2]2–
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Szu‐Yu Ke Chang‐Tsung Yeh Chih‐Chieh Wang Gene‐Hsiang Lee Hwo‐Shuenn Sheu 《无机化学与普通化学杂志》2017,643(10):657-663
A three‐dimensional (3D) 3d‐4f complex, [Cu(en)2][Sm2(C5O5)(C2O4)3(H2O)2] · 8H2O ( 1 ) (en = ethylenediamine, C5O52– = dianion of 4,5‐dihydroxycyclopent‐4‐ene‐1,2,3‐trione), were prepared via the in‐situ ring‐opening oxidation reaction of croconate in the presence of the template‐directed complex, [Cu(en)2]2+ cation. The structural characterization determined by X‐ray diffraction determination reveals that the 3D anionic coordination polymer of [Sm2(C2O4)3(C5O5)(H2O)2]2– in 1 can be describe in terms of in‐plane 2D honeycomb‐like [Sm2(C2O4)3] layered frameworks bridged by oxalate with bis‐chelating mode, being mutually interlinked via the bridge of μ1,2,3,4‐croconate ligands with bis‐chelating coordination mode to complete the 3D open framework, which gives rise to 1D channels with pore size of 14.023 × 11.893 Å (longest atom–atom contact distances) along the b axis. The structure‐directing complex, [Cu(en)2]2+, and solvated water molecules are resided into these honeycomb‐type hexagonal channels. The thermal stability of 1 was further studied by TGA and in‐situ powder X‐ray diffraction measurement. 相似文献
8.
Jin‐Ju Nie Yan‐Tuan Li Zhi‐Yong Wu Xiao‐Wen Li Cui‐Wei Yan 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(11):m323-m326
The title complex, {[Cu2(C14H16N3O4)(C6H6N4S2)]NO3·0.6H2O}n, is a one‐dimensional copper(II) coordination polymer bridged by cis‐oxamide and carboxylate groups. The asymmetric unit is composed of a dinuclear copper(II) cation, [Cu2(dmapob)(dabt)]+ {dmapob is N‐(2‐carboxylatophenyl)‐N′‐[3‐(dimethylamino)propyl]oxamidate and dabt is 2,2′‐diamino‐4,4′‐bithiazole}, one nitrate anion and one partially occupied site for a solvent water molecule. The two CuII ions are located in square‐planar and square‐pyramidal coordination environments, respectively. The separations of the Cu atoms bridged by oxamide and carboxylate groups are 5.2053 (3) and 5.0971 (4) Å, respectively. The complex chains are linked by classical hydrogen bonds to form a layer and then assembled by π–π stacking interactions into a three‐dimensional network. The influence of the terminal ligand on the structure of the complex is discussed. 相似文献
9.
Bian‐Hong Meng Fei Gao Miao‐Li Zhu 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(7):m308-m310
In the structure of the title compound, heptaaqua‐1κ3O,2κ2O,3κ2O‐(μ3‐2,6‐bis{[bis(carboxylatomethyl)amino]methyl}‐4‐chlorophenolato‐1κO;2κ4O,O′,N,O1;3κ4O1N′,O′′,O′′′)dinickel(II)sodium(I) pentahydrate, [NaNi2(C16H14ClN2O9)(H2O)7]·5H2O or [Ni2(Cl‐HXTA)(H2O)4{Na(H2O)3}]·5H2O, the trinuclear complex unit consists of two distorted NiNO5 octahedra bridged by a phenolate O atom and an NaO4 tetrahedron bridged to one of the Ni octahedra by a carboxylate O atom. There are four intramolecular hydrogen bonds forming four six‐membered rings in the complex and the complex molecules are connected to each other by a very complicated hydrogen‐bond network. 相似文献
10.
Brendan J. O'Keefe Peter J. Steel 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):1440-1441
The title complex, tetra‐μ‐acetato‐O:O′‐bis{[μ‐1,4‐bis(2‐pyridyloxy)phenylene‐N,C2:N′,C6]dipalladium(II)} bis(trichloromethane) dihydrate, [Pd4(C16H10N2O2)2(C2H3O2)4]·2CHCl3·2H2O, the product of the reaction of 1,4‐bis(2‐pyridyloxy)benzene with palladium acetate, is shown to be a tetranuclear, rather than a polymeric, species. It crystallizes about a centre of inversion and has two doubly cyclopalladated ligands bridged by four acetate groups. The cyclopalladated ligand is far from planar in the complex and has the central benzene rings π‐stacked. The chelate rings exist in shallow boat conformations. 相似文献
11.
Masato Goto Yoshiyuki Kani Masanobu Tsuchimoto Shigeru Ohba Hideaki Matsushima Tadashi Tokii 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(1):7-11
In the crystals of the five title compounds, tetrakis‐(μ‐3,3‐dimethylbutyrato‐O:O′)bis(ethanol‐O)dicopper(II)–ethanol (1/2), [Cu2(C6H11O2)4(C2H6O)2]·2C2H6O, (I), tetrakis(μ‐3,3‐dimethylbutyrato‐O:O′)bis(2‐methylpyridine‐N)dicopper(II), [Cu2(C6H11O2)4(C6H7N)2], (II), tetrakis‐(μ‐3,3‐dimethylbutyrato‐O:O′)bis(3‐methylpyridine‐N)di‐copper(II), [Cu2(C6H11O2)4(C6H7N)2], (III), tetrakis‐(μ‐3,3‐dimethylbutyrato‐O:O′)bis(4‐methylpyridine‐N)di‐copper(II), [Cu2(C6H11O2)4(C6H7N)2], (IV), and tetrakis‐(μ‐3,3‐dimethylbutyrato‐O:O′)bis(3,3‐dimethylbutyric acid‐O)dicopper(II), [Cu2(C6H11O2)4(C6H12O2)2], (V), the dinuclear CuII complexes all have centrosymmetric cage structures and (IV) has two independent molecules. The Cu?Cu separations are: (I) 2.602 (3) Å, (II) 2.666 (3) Å, (III) 2.640 (2) Å, (IV) 2.638 (4) Å and (V) 2.599 (1) Å. 相似文献
12.
《Chemistry (Weinheim an der Bergstrasse, Germany)》2003,9(16):3719-3719
The cover picture shows how differing coordination algorithms control the molecular architecture of complexes of the pyridazine‐containing, two‐armed, acyclic Schiff base ligand L2 (left, prepared from one equivalent of 3,6‐diformylpyridazine and two equivalents of d‐anisidine). Two very different complexes of L2 self‐assemble from tetrahedral copper(I ) versus octahedral zinc(II ), nickel(II ), and cobalt(II ) controlled 1 : 1 reactions with L2. In both cases the metal ions are bridged by the pyridazine moieties in L2, but in the case of the tetrahedral copper(II ) the result is a tetrametallic [2×2] grid complex ([CuI4(L2)4]4+: top right), whilst in the case of the octahedral metal(II ) ions dimetallic side‐by‐side complexes, [MII2(L2)2(X)4]y+ (M = Mn, Co, Ni, Zn; X = solvent or anion), are formed (bottom right). The cover image was kindly generated by M. Crawford (University of Otago) with Strata Studio Pro (Strata). More details are given by S. Brooker and co‐workers on p. 3772 ff. 相似文献
13.
Jin‐Lei Tian Wen Gu Shi‐Ping Yan Prof. Dai‐Zheng Liao Zong‐Hui Jiang 《无机化学与普通化学杂志》2007,633(3):478-481
A new tetranuclear complex [Fe4 L 2(μ‐O)2(μ‐>OH)2](ClO4)4·H2O ( 1 ), (H L = N,N,N′,N′‐tetrakis‐[(2‐pyridyl)methyl]‐2‐hydroxypropane‐1,3‐diamine) has been synthesized and its crystal structure and magnetic properties are shown. X‐ray crystallography reveals that complex 1 contains a quadruply‐charged, tetranuclear iron(III) cation and four perchlorate anions. In 1 , the Fe4O6 core is composed of a tetrahedron of iron atoms bridged by six oxygen atoms (two oxo, two hydroxo, and two alkoxo groups from L ). This results in an adamantane‐type geometry with the iron atoms occupying the bridgehead positions. Susceptibility data of 1 indicate strong intramolecular antiferromagnetic coupling of high‐spin FeIII atoms. 相似文献
14.
Sevim Hamamci Alisir Necmi Dege Recep Tapramaz 《Acta Crystallographica. Section C, Structural Chemistry》2019,75(4):388-397
Three new diclofenac‐based copper(II) complexes, namely tetrakis{μ‐2‐[2‐(2,6‐dichloroanilino)phenyl]acetato‐κ2O:O′}bis(methanol‐κO)copper(II), [Cu2(μ‐dicl)4(CH3OH)2] ( 1 ), bis{2‐[2‐(2,6‐dichloroanilino)phenyl]acetato‐κ2O,O′}bis(1‐vinyl‐1H‐imidazole‐κN3)copper(II), [Cu(dicl)2(vim)2] ( 2 ), and bis{2‐[2‐(2,6‐dichloroanilino)phenyl]acetato‐κ2O,O′}bis(1H‐imidazole‐κN3)copper(II), [Cu(dicl)2(im)2] ( 3 ) [dicl is diclofenac (C14H10Cl2NO2), vim is 1‐vinylimidazole (C5H6N2) and im is imidazole (C3H4N2)], have been synthesized and characterized by elemental analysis, FT–IR spectroscopy, thermal analysis and single‐crystal X‐ray diffraction. X‐ray diffraction analysis shows that complex 1 consists of dimeric units in which the dicl ligand exhibits a bidentate syn,syn‐μ2 coordination mode linking two copper(II) centres. Complexes 2 and 3 have mononuclear units with the general formula [Cu(dicl)2L2] (L is vim or im) in which the CuII ions are octahedrally coordinated by two L and two dicl chelating ligands. The L and dicl ligands both occupy the trans positions of the coordination octahedron. The different coordination modes of dicl in the title complexes were revealed by Fourier transform IR (FT–IR) spectroscopy. The spin matching between the copper(II) centres in the dimeric [Cu2(μ‐dicl)4(CH3OH)2] units was also confirmed by magnetic data to be lower than the spin‐only value and electron paramagnetic resonance (EPR) spectra. The thermal properties of the complexes were investigated by thermogravimetric (TG) and differential thermal analysis (DTA) techniques. 相似文献
15.
Graham Smith Urs D. Wermuth 《Acta Crystallographica. Section C, Structural Chemistry》2011,67(7):o259-o264
The structures of the 1:1 proton‐transfer compounds of isonipecotamide (piperidine‐4‐carboxamide) with 4‐nitrophthalic acid [4‐carbamoylpiperidinium 2‐carboxy‐4‐nitrobenzoate, C6H13N2O8+·C8H4O6−, (I)], 4,5‐dichlorophthalic acid [4‐carbamoylpiperidinium 2‐carboxy‐4,5‐dichlorobenzoate, C6H13N2O8+·C8H3Cl2O4−, (II)] and 5‐nitroisophthalic acid [4‐carbamoylpiperidinium 3‐carboxy‐5‐nitrobenzoate, C6H13N2O8+·C8H4O6−, (III)], as well as the 2:1 compound with terephthalic acid [bis(4‐carbamoylpiperidinium) benzene‐1,2‐dicarboxylate dihydrate, 2C6H13N2O8+·C8H4O42−·2H2O, (IV)], have been determined at 200 K. All salts form hydrogen‐bonded structures, viz. one‐dimensional in (II) and three‐dimensional in (I), (III) and (IV). In (I) and (III), the centrosymmetric R22(8) cyclic amide–amide association is found, while in (IV) several different types of water‐bridged cyclic associations are present [graph sets R42(8), R43(10), R44(12), R33(18) and R64(22)]. The one‐dimensional structure of (I) features the common `planar' hydrogen 4,5‐dichlorophthalate anion, together with enlarged cyclic R33(13) and R43(17) associations. In the structures of (I) and (III), the presence of head‐to‐tail hydrogen phthalate chain substructures is found. In (IV), head‐to‐tail primary cation–anion associations are extended longitudinally into chains through the water‐bridged cation associations, and laterally by piperidinium–carboxylate N—H...O and water–carboxylate O—H...O hydrogen bonds. The structures reported here further demonstrate the utility of the isonipecotamide cation as a synthon for the generation of stable hydrogen‐bonded structures. An additional example of cation–anion association with this cation is also shown in the asymmetric three‐centre piperidinium–carboxylate N—H...O,O′ interaction in the first‐reported structure of a 2:1 isonipecotamide–carboxylate salt. 相似文献
16.
Korbinian Riener Alexander Pthig Mirza Cokoja Wolfgang A. Herrmann Fritz E. Kühn 《Acta Crystallographica. Section C, Structural Chemistry》2015,71(8):643-646
In recent years, the use of copper N‐heterocyclic carbene (NHC) complexes has expanded to fields besides catalysis, namely medicinal chemistry and luminescence applications. In the latter case, multinuclear copper NHC compounds have attracted interest, however, the number of these complexes in the literature is still quite limited. Bis[μ‐1,3‐bis(3‐tert‐butylimidazolin‐2‐yliden‐1‐yl)pyridine]‐1κ4C2,N:N,C2′;2κ4C2,N:N,C2′‐dicopper(I) bis(hexafluoridophosphate), [Cu2(C19H25N5)2](PF6)2, is a dimeric copper(I) complex bridged by two CNC, i.e. bis(N‐heterocyclic carbene)pyridine, ligands. Each CuI atom is almost linearly coordinated by two NHC ligands and interactions are observed between the pyridine N atoms and the metal centres, while no cuprophilic interactions were observed. Very strong absorption bands are evident in the UV–Vis spectrum at 236 and 274 nm, and an emission band is observed at 450 nm. The reported complex is a new example of a multinuclear copper NHC complex and a member of a compound class which has only rarely been reported. 相似文献
17.
Alfonso Castieiras Ricardo Domínguez Lourdes Gmez‐Rodríguez Joaquín Borrs 《无机化学与普通化学杂志》2003,629(6):1096-1103
A copper(II) and two nickel(II) dinuclear oxalato‐bridged compounds of formulae [{Cu(bpdto)}2(μ‐ox)](ClO4)2 ( 1 ), [{Ni(bpdto)]2(μ‐ox)](ClO4)2( 2 ), and [{Ni(bpdto)}2(μ‐ox)](NO3)2·2H2O ( 3 ), where bpdto = 1, 8‐bis(2‐pyridyl)‐3, 6‐dithiaoctane and ox = oxalate = C2O42— anion, have been synthesized and characterized. The crystal structure of 3 was determined by single‐crystal X‐ray analysis. It is a dinuclear complex with i symmetry in which the oxalate ligand is coordinated in bis(didentate) fashion to the inversion centre‐related nickel atoms. The distorted octahedral environment of each nickel atom is completed by two sulphur atoms in the equatorial plane and by two pyridyl nitrogen atoms in axial positions. Magnetic susceptibility measurements over the range 5 — 299K, show antiferromagnetic interactions that are weak in 1 (J = —12.8 cm—1) and strong in 2 and 3 (J = —37.8 and —40.9 cm—1, respectively), which in the case of 3 is in keeping with the observed structural parameters. 相似文献
18.
Anja Burkhardt Dr. Eike T. Spielberg Sascha Simon Helmar Görls Dr. Axel Buchholz Dr. Winfried Plass Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(5):1261-1271
The reaction of benzyl 2-amino-4,6-O-benzylidene-2-deoxy-α-D -glucopyranoside (HL) with the metal salts Cu(ClO4)2 ⋅ 6 H2O and Ni(NO3)2 ⋅ 6 H2O affords via self-assembly a tetranuclear μ4-hydroxido bridged copper(II) complex [(μ4-OH)Cu4(L)4(MeOH)3(H2O)](ClO4)3 ( 1 ) and a trinuclear alcoholate bridged nickel(II) complex [Ni3(L)5(HL)]NO3 ( 2 ), respectively. Both complexes crystallize in the acentric space group P21. The X-ray crystal structure reveals the rare (μ4-OH)Cu4O4 core for complex 1 which is μ2-alcoholate bridged. The copper(II) ions possess a distorted square-pyramidal geometry with an [NO4] donor set. The core is stabilized by hydrogen bonding between the coordinating amino group of the glucose backbone and the benzylidene protected oxygen atom O4 of a neighboring {Cu(L)} fragment as hydrogen-bond acceptor. For complex 2 an [N4O2] donor set is observed at the nickel(II) ions with a distorted octahedral geometry. The trinuclear isosceles Ni3 core is bridged by μ3-alcoholate O3 oxygen atoms of two glucose ligands. The two short edges are capped by μ2-alcoholate O3 oxygen atoms of the two ligands coordinated at the nickel(II) ion at the vertex of these two edges. Along the elongated edge of the triangle a strong hydrogen bond (244 pm) between the O3 oxygen atoms of ligands coordinating at the two relevant nickel(II) ions is observed. The coordinating amino groups of the these two glucose ligands are involved in additional hydrogen bonds with O4 oxygen atoms of adjacent ligands further stabilizing the trinuclear core. The carbohydrate backbones in all cases adopt the stable 4C1 chair conformation and exhibit the rare chitosan-like trans-2,3-chelation. Temperature dependent magnetic measurements indicate an overall antiferromagnetic behavior for complex 1 with J1=−260 and J2=−205 cm−1 (g=2.122). Compound 2 is the first ferromagnetically coupled trinuclear nickel(II) complex with JA=16.4 and JB=11.0 cm−1 (g1,2=2.183, g3=2.247). For the high-spin nickel(II) centers a zero-field splitting of D1,2=3.7 cm−1 and D3=1.8 cm−1 is observed. The S=3 ground state of complex 2 is consistent with magnetization measurements at low temperatures. 相似文献
19.
Jin‐Yu Sun Zhen Zhao Yong‐Chao Ma Miao‐Li Zhu Xiang‐Dong Zhang 《Acta Crystallographica. Section C, Structural Chemistry》2006,62(1):m4-m6
The crystal structure of the title compound, μ‐2‐hydroxybutanedioato‐1κ2O4,O4′:2κ3O1,O2,O4‐nitrato‐2κO‐tris(1,10‐phenanthroline)‐1κ4N,N′;2κ2N,N′‐dicopper(II) nitrate tetrahydrate, [Cu2(C4H3O5)(NO3)(C12H8N2)3](NO3)·4H2O, contains an unsymmetrical dinuclear copper complex with Cu(phen)2 and Cu(phen)(NO3) moieties (phen is 1,10‐phenanthroline) bridged by a malate (2‐hydroxybutanedioate) ligand, which acts as a double‐bridging and tetradentate ligand. As a result of this double‐bridging action, especially the direct coordination of the O atom of one carboxylate group of malate to the two Cu atoms, the Cu⋯Cu distance is only 4.199 (1) Å and the two phen planes are roughly parallel [the shortest interplanar distance is 3.28 (1) Å], exhibiting an obvious intramolecular π–π stacking interaction. 相似文献
20.
A New Mixed‐Valent Copper Cyanido Complex and a New Copper(II) Acetato Complex,Prepared with an Ionic Liquid
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When copper(II) acetate is treated with the ionic liquid n‐butylmethylimidazolium cyanide (BMIm‐CN), in ethanol solution, two new copper coordination compounds are obtained. (BMIm)2[Cu4(CN)7] comprises a 3D coordination polymer of cyanide bridged copper ions. This anionic coordination polymer contains CuI as well as CuII ions, i.e. it is a mixed‐valent compound. The polymer can be described as honeycomb structure with the BMIm+ cation being located in the cages. The second compound obtained from the chemical reaction is (BMIm)[Cu2(OAc)5][Cu(OAc)2(H2O)]2 · C2H5OH, which can be described as double‐salt. The first unit (BMIm)[Cu2(OAc)5] contains paddle wheel copper(II) acetato moieties, which are bridged by additional acetato ligands and form infinite chains. The second part of the double salt is the neutral, [Cu(OAc)2(H2O)]2 complex. These two parts as well as the co‐crystallized ethanol molecule are connected through a network of hydrogen bridges. 相似文献