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Title: Soft synthesis of a metal-organic framework based on a tribarium building block
Authors: Srinivasan, Bikshandarkoil R
Shetgaonkar, Santosh Y
Raghavaiah, Pallepogu
Keywords: Coordination chemistry
Metal-organic framework
Coordination polymers
Trinuclear compounds
Benzene-1,3,5-tricarboxylic acid
Issue Date: 7-Aug-2012
Abstract: Reaction of MCO<sub>3 </sub>(M = Ba or Ca) with benzene-1,3,5-tricarboxylic acid (H<sub>3</sub>btc) in aqueous medium at room temperature affords in good yields the metal-organic framework material [Ba<sub>3</sub>(btc)<sub>2</sub>(H<sub>2</sub>O)<sub>8</sub>]·2H<sub>2</sub>O (<b style="mso-bidi-font-weight:normal">1</b>) or the layer compound [Ca<sub>3</sub>(btc)<sub>2</sub>(H<sub>2</sub>O)<sub>12</sub>] (<b style="mso-bidi-font-weight:normal">2</b>). The structure of (<b style="mso-bidi-font-weight:normal">1</b>) is a three-dimensional polymer based on a tribarium building unit. In the trinuclear building block, the central Ba(II) situated on an inversion centre exhibits ten coordination, while the symmetry equivalent terminal Ba(II) ions are eight coordinated. The μ<sub>6</sub>-heptadentate bridging binding mode of the unique btc ligand in (<b style="mso-bidi-font-weight: normal">1</b>) results in a 3-D structure with two water molecules situated in the pores. Compound (<b style="mso-bidi-font-weight:normal">2</b>) exhibits a two-dimensional structure, unlike the compositionally similar <i style="mso-bidi-font-style:normal">d</i>-block compounds [M<sub>3</sub>(btc)<sub>2</sub>(H<sub>2</sub>O)<sub>12</sub>] (M = Co, Ni, Zn) which are one-dimensional. A comparative study of several compounds containing the {M<sub>3</sub>(btc)<sub>2</sub>} unit is described.
Description: 1064-1072
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(08) [August 2012]

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