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Abstract
The syntheses, crystal structures, and thermal properties of the coordination polymers [Ca(H2O)2(L1)2] · H2O (1) (L1 = 4-methoxyphenylacetate) and [Ca(H2O)2(L2)2] · 2H2O (2) (L2 = 2-chlorophenylacetate) are described. 1 and 2 can be dehydrated to the anhydrous [Ca(L1)2] (1a) or [Ca(L2)2] (2a), respectively. Compounds 1 and 2 crystallize in the non-centrosymmetric monoclinic space group P21 and the structures consist of a central Ca(II), two terminal waters, and two crystallographically unique L1 (or L2) anions, one of which functions as a chelating bidentate ligand. The second independent L1 (or L2) is tetradentate, coordinated in a μ3-bridging mode leading to the formation of a 1-D coordination polymer. In the infinite chain extending along the b-axis, each Ca(II) is eight-coordinate and bonded to two terminal waters and six oxygens from four different L1 or L2 ligands.
Acknowledgments
BRS thanks Prof. P.K. Bharadwaj, Department of Chemistry, IIT-Kanpur for the single crystal data. Financial support under the Special Assistance Programme [F.540/25/DRS/2007/(SAP-I)] of University Grants Commission, New Delhi and the Nanomission program (SR/NM/NS-86, 2009) of Department of Science and Technology, New Delhi is gratefully acknowledged.