Inorganic-organic hybrid materials based on keggin type polyoxometalates and organic polyammonium cations

摘要

Co-crystallization of a tri-ammonium cation with short and somewhat flexible 'arms', [N,N,N-tris[2-(dimethylamino)ethyl]-1,3,5-benzenetricarboxamid](3+), with a polyoxometalate trianion, PW12O403-, yielded an insoluble channeled or microporous structure. The polyoxometalate clusters are arranged in a layered and zig-zag fashion along the xy plane. Looking along the x-axis, channels of a dimension of similar to3.5 X similar to6.5 Angstrom are observed. It was found that C-H... 0 bonds aided in determining the crystal packing by providing directionality to the anion-cation interaction. On the other hand the co-crystallization of a tetraammonium cation with an extended and rigid tetrahedral configuration, 1,3,5,7-tetrakis{4-[(E)-2(N-methylpyridinium-4-yl)vinyl]phenyl adamantane tetraiodide, with a polyoxometalate tetracation, SiW12O404-, yielded a lamellar structure with alternating layers with spacing of 16.6 Angstrom of the inorganic-organic hybrid material. (C) 2003 Elsevier B.V. All rights reserved. [References: 32]