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Bridging Coordination Modes (bridging + coordination_mode)
Selected AbstractsLanthanide Complexes of Disulfoxide Ligands with Varied Configurations: Influence of Lanthanide Contraction on the Structures of the ComplexesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 10 2005Jian-Rong Li Abstract Four new disulfoxide-LnIII complexes, [Ln(L)2(NO3)3]n {Ln = La (1), n = n; Ln = Gd (2), Dy (3) and Yb (4), n = 2}, have been prepared by the reaction of Ln(NO3)3·nH2O with meso -1,3-bis(ethylsulfinyl)propane (meso - L) in methanol/triethylorthoformate, and their solid-state structures were characterized by IR spectroscopy, elemental analyses and X-ray diffraction. Complex 1 is a 1D double-bridged chain in which the LaIII ions are ten-coordinate and the L ligands adopt both meso and rac configurations, and a bis-monodentate bridging coordination mode. While complexes 2,4 have isostructural dinuclear structures, in which the LnIII ions are nine-coordinate and the ligands show two types of coordination fashions and configurations: bis-monodentate bridging with a meso -configuration, and monodentate coordination with a rac -configuration. The structural differences between 1 and 2,4 indicate the influence of lanthanide contraction on the complex structures. In addition, a change in configuration of the ligand occurs when it reacts with metal ions. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) [source] A new adamantanecarboxylate coordination polymer: poly[[(,3 -adamantane-1,3-dicarboxylato)aquadioxidouranium(VI)] monohydrate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 8 2010Julia A. Rusanova The title compound, {[U(C12H14O4)O2(H2O)]·H2O}n, is the first actinide complex featuring adamantanecarboxylate ligands. The metal ion possesses a pentagonal,bipyramidal UO7 coordination involving two axial oxide ligands [U,O = 1.732,(5) and 1.764,(5),Å] and five equatorial O atoms [U,O = 2.259,(5),2.494,(4),Å] of aqua and carboxylate ligands. The latter display pseudo-chelating and bridging coordination modes of the carboxylate groups that are responsible for the generation of the centrosymmetric discrete uranium,carboxylate [UO2(,- RCOO)2UO2] dimers [U...U = 5.5130,(5),Å] and their connection into one-dimensional chains. Hydrogen bonding involving two coordinated and two solvent water molecules [O...O = 2.719,(7),2.872,(7),Å] yields centrosymmetric (H2O)4 ensembles and provides noncovalent linkage between the coordination chains to generate a three-dimensional network structure. [source] Poly[deca-,2 -cyanido-dicyanidobis(,2 -ethylenediamine)bis(ethylenediamine)tricadmium(II)dicobalt(III)]: a two-dimensional coordination polymerACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2009Olha Sereda The title coordination polymer, [Cd3Co2(CN)12(C2H8N2)4]n, has an infinite two-dimensional network structure. The asymmetric unit is composed of two crystallographically independent CdII atoms, one of which is located on a twofold rotation axis. There are two independent ethylenediamine (en) ligands, one of which bis-chelates to the Cd atom that sits in a general position, while the other bridges this Cd atom to that sitting on the twofold axis. The Cd atom located on the twofold rotation axis is linked to four equivalent CoIII atoms via cyanide bridges, while the Cd atom that sits in a general position is connected to three equivalent CoIII atoms via cyanide bridges. In this way, a series of trinuclear, tetranuclear and pentanuclear macrocycles are linked to form a two-dimensional network structure lying parallel to the bc plane. In the crystal structure, these two-dimensional networks are linked via N,H...N hydrogen bonds involving an en NH2 H atom and a cyanide N atom, leading to the formation of a three-dimensional structure. This coordination polymer is only the second example involving a cyanometallate where the en ligand is present in both chelating and bridging coordination modes. [source] A novel titanium,,-O,zirconium complex: bis(,-methyliminodiethanolato-1,3O,N,O,;1:2,2O)(methyliminodiethanolato-2,3O,N,O,)dipropanolato-1,O,2,O -titanium(IV)zirconium(IV)ACTA CRYSTALLOGRAPHICA SECTION C, Issue 10 2002Graeme J. Gainsford The title compound, [TiZr(C5H11NO2)3(C3H7O)2], contains three methyliminodiethanolate ligands, two in different ,-oxo bridging coordination modes and one bound only to the Ti atom. The Ti and Zr atoms have distorted octahedral and pentagonal,bipyramidal coordinations, respectively, which share edges. As well as some conformational disorder in the carbon chains, there is chemical disorder at one Ti site, with a mix of n - and isopropanolate ligands. [source] | ||||||||||