Krishna Damodaran - Exploring the Effect of Chain Length of Bridging Ligands in Coordination Complexes and Polymers Derived from Mixed Ligand Systems of Pyridylnicotinamides and Dicarboxylates

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      Inorg   Chim Acta,   2009, 362, 1767


      The supramolecular structural diversities in mixed ligand systems   derived from a series of dicarboxylate anions with varying chain   lengths and N-donor exo-bidentate ligand equipped with   hydrogen bonding capable amide backbone with Co(II)/Zn(II) metal   centers are analyzed. In this context, two complexes namely   (Co(L1)2(malonate)(H2O)2}   (1a), {Zn(L1)2(malonate)(H2O)2}   (1b) and one coordination   polymer namely {[Co(μ-L1)(μ-glutarate)(H2O)] ·   H2O}n (4) (where L1 = N-(4-pyridyl)nicotinamide) have   been synthesized and crystallographically characterized. The main   aim of this work is to explore the effects of chain lengths of   the anionic carboxylate ligands such as malonate, succinate,   maleate, and glutarate, in determining the final architecture of   coordination compounds based on the mixed ligands. Analyses of   the structures revealed that the length of the bridging ligands   have prominent effect in the formation of hierarchical   structures.

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