• Two different zinc(II)-aqua complexes held up by a metal-oxide based support: Synthesis, crystal structure and catalytic activity of [HMTAH]2[{Zn(H2O)5}{Zn(H2O)4}{Mo7O24}].2H2O (HMTAH = protonated hexamethylenetetramine)

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      https://www.ias.ac.in/article/fulltext/jcsc/120/01/0095-0103

    • Keywords

       

      Inorganic-organic hybrid material; polyoxometalate supported zinc complexes; crystal structure; supramolecular interactions; catalytic activity.

    • Abstract

       

      An inorganic−organic hybrid material, [HMTAH]2[{Zn(H2O)5}{Zn(H2O)4}{Mo7O24}].2H2O (1) (where HMTAH = protonated hxamethylenetetramine) has been synthesized and structurally characterized. The compound 1 crystallizes in a monoclinic space group $C2/c$. The crystal data of 1: 𝑎 = 43.12(3), 𝑏 = 12.399(10), 𝑐 = 16.285(13), 𝛽 = 111.131(11), 𝑍 = 8. Its crystal structure shows that two different Zn(II)-aqua complexes, [Zn(H2O)5]2+ and [Zn(H2O)4]2+ are covalently coordinated to a heptamolybdateanion [Mo7O24]6- resulting in an anionic species of polyoxometalate supported zinc-aqua complexes, [{Zn(H2O)}{Zn(H2O)4}{Mo7O24}]2-, that is stabilized with two protonated hexamethylenetetramine cations in the title compound 1. In the crystal structure, both lattice water molecules are found to interact with the heptamolybdate cluster anion and the protonated hexamethylenetetramine cation resulting in an intricate three-dimensional hydrogen bonding network. Interestingly, compound 1 exhibits catalytic activity towards oxidation of some primary alcohols.

    • Author Affiliations

       

      T Arumuganathan1 A Srinivasarao1 T Vijay Kumar1 Samar K Das1

      1. School of Chemistry, University of Hyderabad, Hyderabad 500 046
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