Assembling metal phosphonates in the presence of monodentate-terminal and bidentate-bridging pyridine ligands. Use of non-covalent and covalent-coordinate interactions to build polymeric metal-phosphonate architectures

Murugavel, Ramaswamy ; Shanmugan, Swaminathan (2008) Assembling metal phosphonates in the presence of monodentate-terminal and bidentate-bridging pyridine ligands. Use of non-covalent and covalent-coordinate interactions to build polymeric metal-phosphonate architectures Dalton Transactions, 2008 (39). pp. 5358-5367. ISSN 0300-9246

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2008...

Related URL: http://dx.doi.org/10.1039/B805848B

Abstract

The cubic transition metal phosphonates [tBuPO3M(2-apy)]4 (M= Zn (1), Co (2)), whose core resembles the D4R SBU of zeolites, have been synthesized from a reaction between the corresponding metal acetate, tert-butylphosphonic acid and 2-aminopyridine (2-apy) at room temperature. X-Ray structure determination reveals that the molecules of 1 and 2, which crystallize in the tetragonal I41/a space group with crystallographically imposed symmetry, form a 3-D supramolecular assembly aided by N-HO hydrogen bonding. When the same reaction was carried out by using a bridging bidentate Lewis base such as 4,4'-bipyridine, insoluble precipitate is obtained for both zinc and cobalt. In the case of other metal salts such as copper, manganese and nickel, however, one-dimensional polymeric compounds such as [M(tBuPO3H)2(4,4'-bipy)(H2O)2]n (M= Cu (3), Mn (4)), [{Ni(4,4'-bipy)(H2O)4}{tBuPO3H}2{H2O}]n (5) have been isolated. The solid-state structures of 3-5 have been determined by single crystal X-ray diffraction studies. Compounds 3 and 4 are isostructural and crystallize in the triclinic Pspace group with two phosphonate ligands coordinated to the metal centers in a [1.100] fashion, whereas in the case of compound 5, the polymeric backbone is formed by Ni-4,4'-bipy units and the phosphonate anions show no bonding interaction to the metal. The 1-D polymeric chains of 3-5 organize in the solid-state as 3-D supramolecular assemblies with the aid of extensive hydrogen bonding interaction between coordinated water molecules and P-OH or PO groups of the phosphonate ligands.

Item Type:Article
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ID Code:75164
Deposited On:22 Dec 2011 03:24
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