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      https://www.ias.ac.in/article/fulltext/jcsc/124/04/0781-0790

    • Keywords

       

      Coordination polymer; calcium; glycine; zwitter ion; eight coordination.

    • Abstract

       

      A new coordination polymer namely [[Ca6(H-gly)12(H2O)18]Cl12·6H2O]$_n$ (1) (H-gly = glycine) has been isolated from the calcium chloride-glycine-water system and structurally characterized. Each Ca(II) in 1 is eight-coordinated and is bonded to eight oxygen atoms three of which are from terminal water molecules and five oxygen atoms from four symmetry related zwitterionic glycine ligands. The H-gly ligands exhibit two different binding modes viz. a monodentate carboxylate ligation and a $\mu_3$-tetradentate bridging carboxylate binding mode, which results in the formation of a one-dimensional coordination polymer. In the infinite chain the Ca(II) atoms are organized in a zigzag fashion. A comparative study reveals a rich and diverse structural chemistry of calcium halide-glycine compounds.

    • Author Affiliations

       

      Subramanian Natarajan1 Bikshandarkoil R Srinivasan2 J Kalyana Sundar1 K Ravikumar3 R V Krishnakumar4 J Suresh5

      1. School of Physics, Madurai Kamaraj University, Madurai 625 021, India
      2. Department of Chemistry, Goa University, Goa 403 206, India
      3. Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 007, India
      4. Department of Physics, Thiagarajar College, Madurai 625 009, India
      5. Department of Physics, The Madura College, Madurai 625 011, India
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