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Title: An eight-connected metal organic framework based on Cu<sub>5</sub> clusters: Synthesis, structure, magnetic and catalytic properties
Authors: Sarma, Debajit
Natarajan, Srinivasan
Keywords: Coordination polymers
Metal organic framework
Pentameric clusters
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: A reaction of copper acetate, 5-nitroisophthalic acid in a water-methanol mixture under solvothermal condition results in a new metal-organic framework compound, [Cu<sub>5</sub>(µ<sub>3</sub>-OH)<sub>2</sub>(H<sub>2</sub>O)<sub>6</sub>{(NO<sub>2</sub>)-C<sub>6</sub>H<sub>3</sub>-(COO)<sub>2</sub>}<sub>4</sub>].5H<sub>2</sub>O, (<b style="">1</b>). The compound contains Cu<sub>5</sub> pentameric cluster units connected by 5-nitro isophthalate (NIPA) moieties forming a CdCl<sub>2</sub>-like layer, which are further connected by another NIPA moiety forming the three-dimensional structure. The water molecules in (<b style="">1</b>) can be reversibly adsorbed. The removal of water accompanies a change in the colour as well as a structural re-organization. Magnetic studies suggest strong antiferromagnetic correlations between the Cu<sub>5</sub> cluster units. The compound (<b style="">1</b>) exhibits heterogeneous Lewis acid catalysis for the cyanosilylation of imines with more than 95 % selectivity. Compound (<b style="">1</b>) has been characterized by IR, UV-vis, TGA, powder XRD studies.
Description: 1281-1289
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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