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From: | Herman Haynes |
Subject: | [Free-announce] unidentified immersion |
Date: | Thu, 5 Oct 2006 22:50:49 +1100 |
User-agent: | Thunderbird 1.5.0.7 (Windows/20060909) |
![]() The Ag atom is surrounded by four arsine ligands forming a distorted tetrahedral configuration. The combination of the four-stranded chain and the double-chain leads to a three-dimensional network. The complete molecule is generated by twofold symmetry, with the Mn atom lying on a twofold rotation axis. The CuII ion assumes a distorted square-pyramidal coordination geometry. The acetate anions are hydrogen bonded to the coordinated hydroxyl groups and also to the free arm, forming a two-dimensional sheet-like motif. A twofold axis, which is parallel to the c axis, is located at the center of a tetramer. These are connected by TBC dianions, forming a three-dimensional network. These are further aggregated to form a three-dimensional supramolecular structure via hydrogen bonding to chains of corner-sharing tetrameric and chair-like hexameric water clusters. The NiII atom is in a distorted octahedral geometry. S hydrogen bonds, results in a tetranuclear complex with all Na atoms pentacoordinated. The four coordinated water molecules and the hydroxyl atoms from the ligand form intermolecular hydrogen bonds, resulting in a three-dimensional supramolecular network. The two Ni atoms are bridged by two phenolate O atoms of the macrocycle with an Ni. The tridentate BIPI ligand is essentially planar. The unique ZnII atom is in a distorted tetrahedral coordination environment. The Ni atom, which lies on a centre of inversion, is coordinated by two imidazole and two water ligands, as well as by the formylbenzoate groups, in an all-trans octahedral geometry. The O atoms of six DMSO molecules are bonded to the MnII ion in a distorted octahedral geometry. The water-coordinated YbIII atom completes a nine-coordination mode via seven O atoms from four carboxylate ligands, in a monocapped square antiprism. The cation lies on a crystallographic twofold rotation axis and the anion lies on a centre of inversion. O hydrogen bonds, forming a three-dimensional framework. The acetate anions are hydrogen bonded to the coordinated hydroxyl groups and also to the free arm, forming a two-dimensional sheet-like motif. The molecule is centrosymmetric. One of the nitrate ligands chelates in a bidentate manner and the other is monodentate. The Ni atom, which lies on a centre of inversion, is coordinated by two imidazole and two water ligands, as well as by the formylbenzoate groups, in an all-trans octahedral geometry. The Ni atom lies on a centre of symmetry. O hydrogen bonds, forming a three-dimensional framework. |
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