Synthesis and characterisation of double-layered octahedral coordination networks built up from divalent metal ions, mixed carboxylate anions, and ethyl carbazate ligands

Subramani Sathiyakumar, Pitchai Selvam, Faruck Lukmanul Hakkim, Krishnan Srinivasan (Corresponding Author), William T. A. Harrison (Corresponding Author)

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Abstract

A new hydrazone, Z-ethyl 2-(pyridine-2yl-methylene) hydrazine carboxylate(C9H11N3O2; Hpyec) and its metal complexes bis(Z-ethyl 2-(pyridine-2yl-methylene) hydrazine carboxylate) nickel(II) monohydrate, [Ni(pyec)2]·H2O (1) and bis(acetato)(Z-ethyl 2-(pyridine-2yl-methylene) hydrazine carboxylate) cadmium (II), [Cd(Hpyec)(CH3COO)2](2), have been prepared by mechano-chemical syntheses and characterized by elemental analysis, UV-visible, IR and NMR spectroscopy, TG-DTA, and solid state emission techniques. The X-ray single crystal structures of both complexes were determined: in 1, the Ni2+ion is coordinated by two N, N, O-tridentate anionic ligands to generate a distorted cis-NiO2N4 octahedron. In 2, the cadmium atom is seven-coordinated by one neutral N,N.O-tridentate ligand and two chelating acetate ions to generate a very-distorted CdN2O5 pentagonal bipyramid with the Hpyec atoms occupying both axial and one equatorial site. Crystal data: 1, C18H22N6NiO5, Mr = 461.12, monoclinic, P21/c, a = 10.8759 (3) Å, b = 11.7055 (4) Å, c = 16.8424 (5) Å, b = 108.583 (1)°, V = 2032.38 (11) Å3, Z = 4, R(F) = 0.023, wR(F2) = 0.065;2, C13H17CdN3O6, Mr = 423.69, monoclinic, Cc, a = 13.0215 (10) Å, b = 15.8104 (11) Å, c = 7.99 (6) Å, b = 96.692 (2)°, V = 1621.7 (2) Å3, Z = 4, R(F) = 0.017, wR(F2) = 0.038.
Original languageEnglish
JournalJournal of Molecular Structure
Publication statusAccepted/In press - 18 Dec 2018

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Keywords

  • Green synthesis
  • hydrazone
  • metal complexes
  • crystal structures
  • emission study

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