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1.
《Journal of Coordination Chemistry》2012,65(9):1492-1501
Two trinuclear Ni(II) complexes Ni3(L1)2(py)2(DMF)(H2O) (1) and Ni3(L2)2(py)2(DMF)2 (2) with two new trianionic pentadentate ligands N-(3,5-dimethylbenzoyl)-salicylhydrazide (H3L1) and N-(phenylacetyl)-5-nitrosalicylhydrazide (H3L2) have been synthesized and characterized by X-ray crystallography. Nickel ions in the two complexes have square-planar/octahedral/square-planar coordination. Central metal ion and two terminal metal ions in the two complexes are combined by two bridging deprotonated ligands, forming a trinuclear structural unit with an M–N–N–M–N–N–M core. Studies on the trinuclear Ni(II) complexes show that the β-branched N-acylsalicylhydrazide ligands with sterically flexible Cα methylene groups yield linear trinuclear Ni(II) complexes, while α-branched N-acylsalicylhydrazide ligands tend to form bent trinuclear Ni(II) complexes. Antibacterial screening data in a previous study indicates that bent trinuclear Ni(II) compound 1 is more active than linear compound 2 and less active than a tetranuclear nickel compound. 相似文献
2.
Xiaoting Qin Yufei Ji Yanfei Gao Lei Yan Shuai Ding Yanqin Wang Zhiliang Liu 《无机化学与普通化学杂志》2014,640(2):462-468
Three new phenolate oxygen bridged transition metal complexes [Zn3(HL1)3(μ3‐CH3O)]·(ClO4)2(H2O)3 ( 1 ), [Ni2(HL1)2(μ1,1‐N3)(o‐vanillin)]·H2O ( 2 ), [Ni3(HL2)2(PhCOO)2(PhCOOH)2(EtOH)2] ( 3 ) have been synthesized by metal ions and potentially multidentate Schiff base ligands (H2L1 = 2‐((1‐hydroxy‐2‐methylpropan‐2‐ylimino) methyl)‐6‐methoxyphenol; H3L2 = (E)‐1‐((2‐hydroxy‐3‐methoxy‐benzylidene)amino)ethane‐1,2‐diol). All the three complexes 1 , 2 , and 3 have been characterized by elemental analysis, FT‐IR spectroscopy, and single‐crystal X‐ray diffraction studies. Crystal structures reveal that complex 1 is a trinuclear incomplete cubane‐like zinc cluster whereas complex 2 is a dinuclear nickel complex bridged by azide, and compound 3 is a trinuclear nickel complex. The luminescent property for complex 1 and magnetic behaviors for complexes 2 and 3 have been investigated. 相似文献
3.
Guang-Qi Jiang Ruo Wang Li-Li Long Tao Sun Zai-chang Yang Yun-Qian Zhang 《Journal of Coordination Chemistry》2016,69(4):678-686
Four new complexes have been prepared and characterized from reaction of the tetrapodal Schiff base ligand 1,1,1,1-tetrakis[(3-methoxysalicylaldimino)methyl]methane (H4L) with Cu(II), Ni(II) and Cd(II). X-ray diffraction experiments revealed that 1 ([Cu2L·2H2O]·H2O) and 2 ([Cu2L·2CH3OH]·3H2O) are dinuclear complexes, with the same tetragonal pyramidal coordination geometries around their Cu(II) ions. Complex 3 ([Ni2L]·2H2O) is dinuclear with two square planar Ni(II) ions coordinated to two pairs of the pendant branches of H4L. Complex 4 ([Cd3(HL)2]·3H2O) is a linear trinuclear species with three Cd(II) ions, which were intermolecularly coordinated to three pendant branches of two H4L ligands via an uncommon intermolecular phenoxo oxygen face-sharing mode. The in vitro antimicrobial activities of H4L and its complexes were evaluated against four micro-organisms (Colibacillus, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis) using the tube-dilution method. The results revealed that 3 showed good inhibitory activity against the Gram-positive bacteria S. aureus and B. subtilis with MIC values of 62.5 and 31.0 μg mL, respectively. 相似文献
4.
Hyo-Suk Kim Sheby Mary George Eun Ae Jung Jeong Hwan Han Bo Keun Park Seung Uk Son 《Journal of Coordination Chemistry》2016,69(17):2591-2597
New magnesium complexes, [Et2Mg3(dmamp)4] (1) and [(CH2=CH)2Mg3(dmamp)4] (2), were prepared by the reaction of alkylmagnesium bromide with sodium 1-dimethylamino-2-methyl-2-propoxide [Na(dmamp)] in THF. Complexes 1 and 2 were characterized by 1H and 13C NMR spectroscopies, FTIR spectroscopy, elemental analysis, and single-crystal X-ray diffraction (XRD) analysis. The XRD analysis showed that these complexes are trinuclear where the alkoxy O is the μ2-O bridge between the Mg ions. Among the three metal centers, the two terminal Mg ions are five coordinate and have a square–pyramidal geometry, whereas the central Mg is four coordinate with a distorted tetrahedral geometry. The combination of ethyl and vinyl groups with sterically bulky aminoalkoxide ligands plays an important role in stabilizing the molecule. 相似文献
5.
S. E. Nefedov M. A. Uvarova M. A. Golubnichaya I. V. Nefedova D. G. Chikhichin V. A. Kotseruba O. A. Levchenko G. L. Kamalov 《Russian Journal of Coordination Chemistry》2014,40(6):358-365
Room-temperature oxidation of a mixture of the complex (CoII)3(μ-OOCBu t )6(NEt3)2 and dibenzyl ether (DBE) with atmospheric oxygen in dichloromethane-benzene (4: 1) gave the hexanuclear complex [(CoIII)6(μ4-O)2(μ3-O)2(μ-OOCBu t )9(OH)2(HOOCBu t )](HNEt3) · 0.5DBE · C6H6 (I) as the major reaction product. According to X-ray diffraction data, the metal framework of complex I contains the pseudocubane fragment [Co4(μ4-O)2(μ3-O)2] linked with two “peripheral” cobalt(III) ions. The possibility of using complex I as an intermediate catalyst for liquid-phase oxidation of DBE as well as the conformational changes in the DBE molecule due to its adaptation to the metal complexes are discussed. 相似文献
6.
Jin-Dong Wang Dr. Kong-Qiu Hu Dr. Zhi-Wei Huang Prof. Lei Mei Dr. Ji-Pan Yu Prof. Zhi-Fang Chai Dr. Xin-Peng Wang Prof. Wei-Qun Shi 《欧洲无机化学杂志》2023,26(15):e202300072
The polynuclear metal clusters continually attract wide interest due to their intriguing structures and potential applications in various scientific fields. Here, four actinide clusters have been synthesized by the utilization of multifunctional ligand ferrocenecarboxylic acid (HFcc) and Th4+/U4+ ions by solvent evaporation or solvothermal synthesis strategies in different solvents. Therein, compounds 1 , 2 and 4 feature similar [An6(μ3-O)4(μ3-OH)4]12+ cores, which are further coordinated by 12 Fcc− ligands and different solvent molecules. The U6Fe12 cluster of compound 4 is linked by four free HFcc molecules via multiple hydrogen bonding to form a supramolecular cluster [U6(μ3-O)4(μ3-OH)4(Fcc)12(H2O)4] ⋅ 4HFcc. The cluster core of compound 3 is a μ3-O2− bridged [U3(μ3-O)]10+ unit, which is further coordinated by 10 Fcc− ligands via three kinds of coordination modes. It is worth noting that multifunctional Fcc− ligand not only endows compound 1 a main redox wave at E1/2=0.720 V in CH2Cl2/DMF solution, but also enables it to exhibit aggregation-induced emission (AIE) property. 相似文献
7.
Changkun Xia Yuanyuan Min Wen Sun Kai Yang Yunlong Wu 《Journal of Coordination Chemistry》2018,71(1):12-21
Two dinuclear Fe(III) metal–organic complexes with tetracarboxylate and chelating N-donor ligands, [Fe(Hbtec)(phen)(H2O)]2·2H2O (1) and [Fe(Hbtec)(bpy)(H2O)]2·2H2O (2) (H4btec = 1,2,3,5-benzenetetracarboxylic acid, phen = 1,10-phenanthroline, bpy = 2,2′-bipyridine) have been prepared and characterized by elemental analysis, IR spectroscopic, and X-ray diffraction methods. Both complexes crystallize in the monoclinic space group P21/c with two Fe(III) ions bridged by two Hbtec3? ligands into a dinuclear unit. Hydrogen bonding connects the dinuclear units into a 3-D framework. The dinuclear units are 10-connected nodes that produce a 3-D framework with topology Schläfli symbol as (312·428·55). Thermal stabilities and luminescent properties of the two complexes have also been investigated. 相似文献
8.
《Journal of Coordination Chemistry》2012,65(2):306-315
Reactions of 2,4-dihydroxyacetophenone oxime with manganese salts yielded two manganese crowns, [Mn3(μ 3-O)(4-OH-Me-sao)3(HCOO)(MeOH)5]·MeOH (1) and [Mn3(μ 3-O)(4-OH-Me-sao)3(CH3COO)(MeOH)5]·MeOH (2) (4-OH-Me-saoH2=2,4-dihydroxyacetophenone oxime). Both compounds possess [MnIII 3(μ 3-O)]7+ cores which contain 9-MC-3 metallacrown (MC) rings with the repeating pattern [–Mn–N–O–]. However, the difference in the structures of both compounds is coordinated carboxylates. In 1 and 2, the MC molecules are connected with each other through intermolecular hydrogen bonds, generating similar 3-D supramolecular networks. Magnetic properties reveal that in 1 and 2 the metal ions exhibit ferromagnetic exchange coupling. 相似文献
9.
Olga Botezat Irina G. Filippova Jürg Hauser Karl Krämer Silvio Decurtins Shi-Xia Liu 《Journal of Coordination Chemistry》2016,69(1):72-80
A new μ3-oxo trinuclear chromium(III) propionate cluster, [Cr3(μ3-O)(O2CCH2CH3)6(pyr)3]NO3·0.25(H2O) (1), has been synthesized by reaction of a μ3-oxo trinuclear chromium(III) propionate precursor [Cr3(μ3-O)(O2CCH2CH3)6(H2O)3]NO3 with a pyrazol ligand (pyr) and characterized by IR spectroscopy, single-crystal X-ray structure determination, and thermal analysis. Magnetic susceptibility and magnetization studies revealed antiferromagnetic exchange interactions within the trinuclear Cr(III) cluster (J = ?11.9 cm?1) and determined the electronic ground state (S = ½) of the compound. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(12):1063-1074
The oxo-bridged dinuclear complexes [(μ-O){ReOCl2(L)}2] [L = 2-(1-ethylaminomethyl)-1-methylimidazole (eami); 2-(1-methylaminomethyl)-1-methylimidazole (mami); 2-(1-ethylthiomethyl)-1-methylimidazole (etmi)] were prepared by reaction of trans-[ReOCl3(PPh3)2] with L in acetone. X-ray crystallographic studies of the eami and etmi complexes show that these ligands coordinate in a bidentate manner, and that the cis, cis-N2Cl2 and cis, cis-NSCl2 equatorial planes are nearly orthogonal to the O=Re-O-Re=O backbone. 相似文献
11.
《Journal of Coordination Chemistry》2012,65(24):4236-4244
The angular polytopic dipyridyl ligand 2,6-bis(quinoline-2-carboxamido)pyridine (H2L) was prepared. Assemblies of H2L with ZnAc2 and HgAc2 resulted in two new dinuclear complexes [Zn2(L)(Ac)2]?·?1.5H2O?·?0.5CH3OH (1) and [Hg2(L)(Ac)2]?·?5H2O?·?CH3OH (2) where the doubly deprotonated L2? bi-chelate as μ-kN,N′?:?kN″,N″′, bridging the two metal centers (Ac?=?acetate). In 1, the two Zn(II) ions are also doubly bridged by two Ac ions in a μ-kO?:?kO′ coordination, and thus each metal center adopts a distorted tetrahedral geometry. In 2, each Ac ion is only terminal to Hg(II), in a rare distorted triangular or T-shaped coordination geometry. Free H2L, 1, and 2 emit interesting bluish-green fluorescence with strong intensities. Thermogravimetric analysis of 1 shows that the dinuclear structure of 1 is stable to 382°C. 相似文献
12.
《Journal of Coordination Chemistry》2012,65(10):1720-1728
The reaction of H2L (N,N ′-bis(5-ethyl-1,3,4-thiadiazol-2-yl)-2,6-pyridinedicarboxamide) with Ni(II) salts gave crystals of two new complexes, [Ni3(µ3-O)(H2L)(L)2] · 2DMF (1) and [Ni2(µ-H2O)(CH3OH)(DMF)(L)2] · H2O · CH3OH (2). The complexes were characterized by elemental analysis, IR, thermal analysis, and X-ray single crystal diffraction. Complex 1 is a trinuclear complex containing a triangle frame in the center formed by three Ni(II) atoms with a bridging µ3-O. Complex 2 is dinuclear formed by two Ni(II) atoms with a bridging H2O. H2L coordinates to metal centers as a pentadentate ligand in 1 and tetradentate in 2. Thermal analysis shows that the thermal stability of 1 is higher than that of 2. In addition, the magnetic properties of 2 are also reported. 相似文献
13.
Kai Wang Gen Luo Dr. Jianquan Hong Prof. Dr. Xigeng Zhou Prof. Dr. Linhong Weng Prof. Dr. Yi Luo Assoc. Prof. Dr. Lixin Zhang 《Angewandte Chemie (International ed. in English)》2014,53(4):1053-1056
Two new trinuclear μ3‐bridged rare‐earth metal phosphinidene complexes, [{L(Ln)(μ‐Me)}3(μ3‐Me)(μ3‐PPh)] (L=[PhC(NC6H4iPr2‐2,6)2]?, Ln=Y ( 2 a ), Lu ( 2 b )), were synthesized through methane elimination of the corresponding carbene precursors with phenylphosphine. Heating a toluene solution of 2 at 120 °C leads to an unprecedented ortho C? H bond activation of the PhP ligand to form the bridged phosphinidene/phenyl complexes. Reactions of 2 with ketones, thione, or isothiocyanate show clear phospha‐Wittig chemistry, giving the corresponding organic phosphinidenation products and oxide (sulfide) complexes. Reaction of 2 with CS2 leads to the formation of novel trinuclear rare‐earth metal thione dianion clusters, for which a possible pathway was determined by DFT calculation. 相似文献
14.
系统地报道了9个三核钼硫簇合物的合成和结构表征. 晶体结构分析表明, 其中化合物1和6具有[Mo3(μ3-S)(μ-S)3]簇芯, 化合物2和3具有不对称的簇芯[Mo3(μ3-S)(μ-O)(μ-S)2], 化合物4, 5, 7和8具有少见的[Mo3(μ3-O)(μ-S)3]簇芯, 而化合物9则具有[Mo3(μ3-S)(μ-S2)3]簇芯. 这一系列不同的簇芯以及桥配体和“松散”配位的端配体造成了不同的堆积结构. 讨论了前三种簇芯的电子结构, 并根据它们的立体构型和电子结构对某些重要的谱学表征结果做了合理的诠释. 测定了化合物4的变温电导率, 表明其具有半导体导电性能. 相似文献
15.
Despoina Andriotou Dr. Sylvain Duval Prof. Christophe Volkringer Dr. Xavier Trivelli Dr. William E. Shepard Dr. Thierry Loiseau 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(59):e202201464
The reactivity of aryl monocarboxylic acids (benzoic, 1- or 2-naphtoic, 4’-methylbiphenyl-4-carboxylic, and anthracene-9-carboxylic acids) as complexing agents for the ethoxide niobium(V) (Nb(OEt)5 precursor has been investigated. A total of eight coordination complexes were isolated with distinct niobium(V) nuclearities as well as carboxylate complexation states. The use of benzoic acid gives a tetranuclear core Nb4(μ2-O)4(L)4(OEt)8] (L=benzoate ( 1 )) with four Nb−(μ2-O)−Nb linkages in a square plane configuration. A similar tetramer, 7 , was obtained with 2-naphtoic acid by using a 55 % humid atmosphere synthetic route. Two types of dinuclear brick were identified with one central Nb−(μ2-O)−Nb linkage; they differ in their complexation state, with one bridging carboxylate ([Nb2(μ2-O)(μ2-OEt)(L)(OEt)6], with L=1-naphtoate ( 3 ) or anthracene-9-carboxylate ( 5 )) or two bridging carboxylate groups ([Nb2(μ2-O)(L)2(OEt)6], with L=4’-methylbiphenyl-4-carboxylic ( 4 ) or anthracene-9-carboxylate ( 6 )). An octanuclear moiety [Nb8(μ2-O)12(L)8(η1-L)4−x(OEt)4+x] (with L=2-naphtoate, x=0 or 2; 8 ) was obtained by using a solvothermal route in acetonitrile; it has a cubic configuration with niobium centers at each node, linked by 12 μ2-O groups. The formation of the niobium oxo clusters was characterized by infrared and liquid 1H NMR spectroscopy in order to analyze the esterification reaction, which induces the release of water molecules that further react through oxolation with niobium atoms, in different {Nb2O}, {Nb4O4} and {Nb8O12} nuclearities. 相似文献
16.
In this study, the mononuclear complexes of cadmium(II) and dinuclear complexes of uranyl(VI) with five vic-dioximes have been obtained. Cadmium(II) forms, with ligands, complexes [(L xH)(Cl)(H2O)(Cd)] with x=1–5. Mononuclear complexes with a metal: ligand ratio of 1:1 were obtained for cadmium(II) with the ligands, and a chloride ion and a water molecule are also coordinated to the cadmium(II) ions. Uranyl(VI) complexes of these ligands are a dinuclear structure with μ-hydroxo-bridges. Uranyl(VI) forms, with ligands, complexes [(LxH)2(OH)2(UO2)2] with x=1–5, which have a 2:2 metal:ligand ratio. The structures of the complexes were identified by elemental analysis, i.r., and 1H-n.m.r. spectra, u.v.–vis. spectroscopy, magnetic susceptibility measurements, conductivity measurements and thermogravimetric analysis (t.g.a.). 相似文献
17.
《Journal of Coordination Chemistry》2012,65(24):4259-4270
One nonlinear and one linear trinuclear copper(II) complex [Cu3(dien)2(pdc)2CH3OH]2?·?6CH3OH (1) and [Cu3(pdc)2(CH3OH)6(H2O)4] (2) were prepared and characterized structurally, where dien is diethylenetriamine and pdc3? the trianion of 3,5-pyrazoledicarboxylic acid. Both complexes consist of 3,5-pyrazoledicarboxylato-bridged trinuclear copper(II) centers. In 1, copper(II) ions are five-coordinate in distorted square pyramids with bond angles 164.78° for Cu(1)–Cu(2)–Cu(3) and 164.51° for Cu(4)–Cu(5)–Cu(6). In 2, the three copper(II) ions are six-coordinate with elongated octahedral geometry. The trinuclear units of 1 and 2 interact through hydrogen bonds to form 3-D and 2-D supramolecular networks, respectively. Variable temperature magnetic susceptibility measurements show that 1 and 2 are antiferromagnetically coupled with J values of ?11.2 and ?13.3?cm?1. 相似文献
18.
Gerrit Schaper Dr. Marco Wenzel Dr. Felix Hennersdorf Prof. Dr. Leonard F. Lindoy Prof. Dr. Jan J. Weigand 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(33):8484-8491
The reaction of UO2(OAc)2 ⋅ 2H2O with the biologically inspired ligand 2-salicylidene glucosamine (H2 L1 ) results in the formation of the anionic trinuclear uranyl complex [(UO2)3(μ3-O)( L1 )3]2− ( 1 2−), which was isolated in good yield as its Cs-salt, [Cs]2 1 . Recrystallization of [Cs]2 1 in the presence of 18-crown-6 led to formation of a neutral ion pair of type [M(18-crown-6)]2 1 , which was also obtained for the alkali metal ions Rb+ and K+ (M=Cs, Rb, K). The related ligand, 2-(2-hydroxy-1-naphthylidene) glucosamine (H2 L2 ) in a similar procedure with Cs+ gave the corresponding complex [Cs(18-crown-6)]2[(UO2)3(μ3-O)( L2 )3 ([Cs(18-crown-6)]2 2 ). From X-ray investigations, the [(UO2)3O( Ln )3]2− anion (n=1, 2) in each complex is a discrete trinuclear uranyl species that coordinates to the alkali metal ion via three uranyl oxygen atoms. The coordination behavior of H2 L1 and H2 L2 towards UO22+ was investigated by NMR, UV/Vis spectroscopy and mass spectrometry, revealing the in situ formation of the 1 2− and 2 2−dianions in solution. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(16):2770-2787
The syntheses, crystal structures, and magnetic properties of two new copper(II) complexes with molecular formulas [Cu7(μ2-OH2)6(μ3-O)6(adenine)6](NO3)2·6H2O (1) and [Cu2(μ2-H2O)2(adenine)2(H2O)4](NO3)4·2H2O (2) are reported. The heptanuclear compound is composed of a central octahedral CuO6 core sharing edges with six adjacent copper octahedra. In 2, the copper octahedra shares one equatorial edge. In both compounds, these basic copper cluster units are further linked by water bridges and bridging adenine ligands through N3 and N9 donors. All copper(II) centers exhibit Jahn–Teller distorted octahedral coordination characteristic of a d9 center. The study of the magnetic properties of the heptacopper complex revealed a dominant ferromagnetic intra-cluster interaction, while the dicopper complex exhibits antiferromagnetic intra-dimer interactions with weakly ferromagnetic inter-dimer interaction. 相似文献
20.
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