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Title: An eight-connected metal organic framework based on Cu5 clusters: Synthesis, structure, magnetic and catalytic properties
Authors: Sarma, Debajit
Natarajan, Srinivasan
Keywords: Coordination polymers;Metal organic framework;Pentameric clusters;Cyanosilylation;Polycarboxylates;Imines;Copper
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, [Cu53-OH)2(H2O)6{(NO2)-C6H3-(COO)2}4].5H2O, (1). The compound contains Cu5 pentameric cluster units connected by 5-nitro isophthalate (NIPA) moieties forming a CdCl2-like layer, which are further connected by another NIPA moiety forming the three-dimensional structure. The water molecules in (1) 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 Cu5 cluster units. The compound (1) exhibits heterogeneous Lewis acid catalysis for the cyanosilylation of imines with more than 95 % selectivity. Compound (1) has been characterized by IR, UV-vis, TGA, powder XRD studies.
Page(s): 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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