Crystal engineering of mixed-ligand frameworks: Ligand-directed assembly and structural diversity
Resource
Inorganica Chimica Acta 362 (2): 543-550
Journal
Inorganica Chimica Acta
Journal Volume
362
Journal Issue
2
Pages
543-550
Date Issued
2009
Author(s)
Abstract
Four new coordination networks based on dipyridyl linkages 2,6-(N,N′-di(4-pyridyl)amino)pyridine (dpap) or 1,3-bis(4-pyridyl)propane (bpp) and different dicarboxylates have been synthesized and structurally characterized. Using dpap to react with two different dicarboxylates, maleic acid (H2mal) and 4,4′-sulfonyldibenzoate (H2sdba), respectively, two different two-dimensional (2D) coordination polymers of Cd(II), [Cd(dpap)(mal)]n (1) and {[Cd(dpap)(sdba)] · 2H2O}n (2) were obtained. Compound 1 features a 42-membered bimetallic macrocyclic structural motif which is extended by mal groups to form a 2D network. In the case of 2, two different layers can be achieved depending on the conformation of sdba. The layer has a (8210) net topology with Cd as nodes and dpap, sdba bridges as the connectors. The overall structure of {[Mn(dpap)(sdba)] · 1.5H2O}n (3) similar to that of 2 despite the presence of different metal ions. When dpap was replaced by bpp to react with Co(NO3)2 · 6H2O, another 1D coordination polymer, {[Co(bpp)(H2O)4] · sdba}n(4) was constructed. The 1D chains join sdba to make an overall 3D supramolecular architecture by hydrogen-bonding interactions (R24 (22),R24 (12)). The Cd coordination polymers exhibit strong solid-state luminescence emission at room temperature. Thermal stability of these crystalline materials has been explored by thermogravimetric analysis of mass loss. © 2008 Elsevier B.V. All rights reserved.
Type
journal article
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