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Bipyramidal Environment (bipyramidal + environment)
Selected AbstractsA novel two-dimensional framework based on unprecedented cadmium(II) chainsACTA CRYSTALLOGRAPHICA SECTION C, Issue 2 2009Jie Qin The bent ligand 4-[(1H -1,2,4-triazol-1-yl)methyl]benzoic acid (HL) has been used to create the novel two-dimensional coordination polymer poly[,2 -aqua-,2 -chlorido-{,2 -4-[(1H -1,2,4-triazol-1-yl)methyl]benzoato}cadmium(II)], [Cd(C10H8N3O2)Cl(H2O)]n, under hydrothermal reaction of HL with cadmium chloride. The crystallographically unique Cd atom is seven-coordinated in an approximately pentagonal,bipyramidal environment of two carboxylate O atoms, two water O atoms, two Cl atoms and one triazole N atom. A notable feature is the presence of zigzag ...Cd...Cd... inorganic chains, in which neighboring CdII ions are doubly bridged by pairs of ,2 -Cl atoms and ,2 -H2O ligands in an alternating fashion. To the authors' knowledge, this is the first example containing this bridging mode in a cadmium(II) framework. The chains are connected to one another through the bridging L, ligand into a two-dimensional undulating network. All of the two-dimensional nets stack exactly together in an ,AA, stacking sequence along the crystallographic b axis. Neighboring layers are further linked into a three-dimensional framework via interlayer hydrogen-bonding interactions. [source] (1,3-Dimethylimidazolidine-2-selone-,Se)bis(1,10-phenanthroline-,2N,N,)copper(II) bis(perchlorate) and bis(2,2,-bipyridyl-,2N,N,)(imidazolidine-2-thione-,S)copper(II) bis(perchlorate)ACTA CRYSTALLOGRAPHICA SECTION C, Issue 8 2007Alexander J. Blake In the first title salt, [Cu(C12H8N2)2(C5H10N2Se)](ClO4)2, the CuII centre occupies a distorted trigonal,bipyramidal environment defined by four N donors from two 1,10-phenanthroline (phen) ligands and by the Se donor of a 1,3-dimethylimidazolidine-2-selone ligand, with the equatorial plane defined by the Se and by two N donors from different phen ligands and the axial sites occupied by the two remaining N donors, one from each phen ligand. The Cu,N distances span the range 1.980,(10),2.114,(11),Å and the Cu,Se distance is 2.491,(3),Å. Intermolecular ,,, contacts between imidazolidine rings and the central rings of phen ligands generate chains of cations. In the second salt, [Cu(C10H8N2)2(C3H6N2S)](ClO4)2, the CuII centre occupies a similar distorted trigonal,bipyramidal environment comprising four N donors from two 2,2,-bipyridyl (bipy) ligands and an S donor from an imidazolidine-2-thione ligand. The equatorial plane is defined by the S donor and two N donors from different bipy ligands. The Cu,N distances span the range 1.984,(6),2.069,(7),Å and the Cu,S distance is 2.366,(3),Å. Intermolecular ,,, contacts between imidazolidine and pyridyl rings form chains of cations. A major difference between the two structures is due to the presence in the second complex of two N,H...O hydrogen bonds linking the imidazolidine N,H hydrogen-bond donors to perchlorate O-atom acceptors. [source] Crystallographic report: Tricarbonyl(,5 -cyclopentadienyl)(dichloroindium) molybdenumAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 7 2004T. Grabowy Abstract In the solid state, [{Cp(CO)3Mo}InCl2], forms a one-dimensional coordination polymer in which the indium atoms are coordinated by four chlorine atoms (InCl: 2.448(2),3.004(2) Å) and a {Cp(CO)3Mo} group (InMo: 2.750(1) Å) in a distorted trigonal bipyramidal environment. Copyright © 2004 John Wiley & Sons, Ltd. [source] Di-2-pyridyl Ketone Oxime in Zinc Chemistry: Inverse 12-Metallacrown-4 Complexes and Cationic Pentanuclear ClustersEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 10 2005Maria Alexiou Abstract The use of di-2-pyridyl ketone oxime (Hpko)/X, "blends" (X, = PhCO2,, N3,, NCO,, acac,, NCS,) in zinc chemistry yields neutral tetranuclear and cationic pentanuclear clusters. Various synthetic procedures have led to the synthesis of compounds [Zn4(OH)2(O2CPh)2(pko)4]·3MeCN (1·3MeCN), [Zn4(OH)2(N3)2(pko)4]·4DMF (2·4DMF), [Zn4(OH)2(NCO)2(pko)4]·3DMF·H2O (3·3DMF·H2O), [Zn4(OH)2(acac)2(pko)4]·4CH2Cl2 (4·4CH2Cl2), [Zn5Cl2(pko)6][ZnCl(NCS)3]·2.5H2O·1.5MeOH (5·2.5H2O·1.5MeOH) and [Zn5(NCS)2(pko)6(MeOH)][Zn(NCS)4]·2.5H2O·MeOH (6·2.5H2O·MeOH). The structures of the six complexes have been determined by single-crystal X-ray crystallography. The tetranuclear molecules of 1,4 lie on a crystallographic inversion centre and have an inverse 12-metallacrown-4 topology. Two triply bridging hydroxides are accommodated in the centre of the metallacrown ring. The pko, ligands form a propeller configuration that imposes absolute stereoisomerism with , and , chirality. Two metal ions are in distorted O2N4 octahedral environments, whereas the rest are in severely distorted tetrahedral or trigonal bipyramidal environments. The five Zn ions of the cations of 5 and 6 are held together by six pko, ligands which adopt three different coordination modes; the chloro (5) and isothiocyanato (6) ligands are terminal. The five Zn ions define two nearly equilateral triangles sharing a common apex, and the novel Zn5 topology can be described as two "collapsed" 9-metallacrown-3 structures sharing a common Zn apex. Besides the pentanuclear cations, the structures of 5 and 6 contain slightly distorted tetrahedral [ZnCl(NCS)3]2, and [Zn(NCS)4]2, ions, respectively, with the isothiocyanato ligands binding the metal ion in a virtually linear fashion. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) [source] |