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  • Title: Influence of ligand geometry on the formation of In-O chains in metal-oxide organic frameworks (MOOFs).
    Author: Vougo-Zanda M, Wang X, Jacobson AJ.
    Journal: Inorg Chem; 2007 Oct 15; 46(21):8819-24. PubMed ID: 17883266.
    Abstract:
    Three indium-oxide organic frameworks, In(2)O(1,3-BDC)(2), 1; In(OH)(2,6-NDC)(H(2)O), 2; and In(OH)(2,7-NDC)(H(2)O), 3 (BDC = benzene dicarboxylic acid and NDC = naphthalene dicarboxylic acid), were synthesized and characterized by thermogravimetric analysis, infrared spectroscopy, and single-crystal X-ray diffraction. Previously, we reported the structure of In(OH)(1,4-BDC).(0.75H(2)BDC), 0, where the framework is built by interconnecting In-OH-In chains with the BDC anions to form large diamond-shaped one-dimensional channels filled with guest molecules. Compounds 0-3 all contain In-O(H) chains, but the coordination and geometry depend on the nature of the dicarboxylate ligand. Compound 0 contains In-O octahedral centers that connect to form a single trans octahedral chain, while in compound 1, they connect to form a more complex double chain of octahedra. Both compounds 2 and 3 contain chains of connected pentagonal bipyramidal InO(6)(OH(2)) units. In 2, these units share trans vertices that are cross-linked by chelating 2,6-NDC anions, whereas in compound 3, cis vertices are shared to form chains that are linked by the 2,7-NDC anions.
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