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      https://www.ias.ac.in/article/fulltext/jcsc/128/11/1765-1774

    • Keywords

       

      Alkaline-earth; 4-nitophenylacetic acid; one-dimensional; μ& #8322; -bridging tridentate; coordination polymer.

    • Abstract

       

      The synthesis, crystal structure, spectral characteristics and thermal properties of alkaline-earth metal salts of 4-nitrophenylacetic acid (4-npaH) namely, [Mg(H₂O)₆](4-npa)₂·4H₂O (4-npa = 4-nitrophenylacetate) (1), [Ca(H₂O)₂(4-npa)₂] (2) and [Sr(H₂O)₃(4-npa)₂]·4.5H₂O(3) are reported. In 1, the 4-npa ion functions as a charge balancing counter anion for the octahedral [Mg(H₂O)6]²⁺ unit with the Mg(II) ion situated on a centre of inversion. The two unique lattice water molecules link the [Mg(H₂O)₆]²⁺ cations and 4-npa anions with the aid of O-H· · ·O interactions. Compounds 2 and 3 are one-dimensional (1-D) coordination polymers containing an eight coordinated Ca(II) situated in a general position and a nine coordinated Sr(II) located on a twofold axis. The μ₂-bridging tridentate binding modes of the crystallographically independent 4-npa ligands in 2 and the unique 4-npa ligand in 3 link the bivalent metal ions into an infinite chain with alternating Ca· · · Ca separations of 3.989 and 4.009 Å, respectively, and a single Sr· · · Sr separation of 4.194Å in the 1-D chain.

    • Author Affiliations

       

      BIKSHANDARKOIL R SRINIVASAN1 KIRAN T DHAVSKAR1 CHRISTIAN NÄTHER2

      1. Department of Chemistry, Goa University, Goa 403 206, India
      2. Institut für Anorganische Chemie, Christian-Albreschts Universität Kiel, D-24098 Kiel, Germany
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