Synthesis, Spectral Characterization and Crystal Structures of Dioxidomolybdenum(VI) Complexes Derived from Nicotinoylhydrazones

  • T. M. Asha
  • M. R. P. KurupEmail author
Original Paper


Cis-dioxidomolybdenum(VI) complexes [MoO2L1(DMSO)] (1), [MoO2L2(H2O)]·DMF (2) and [MoO2L3(DMF)] (3) were synthesized by solution based reactions of aroylhydrazones (H2L1 = 5-chloro-2-hydroxybenzaldehyde nicotinoylhydrazone, H2L2 = 2-hydroxy-5-iodobenzaldehyde nicotinoylhydrazone and H2L3 = 3,5-dichloro-2-hydroxybenzaldehyde nicotinoylhydrazone) with bis(acetylacetonato)dioxidomolybdenum(VI) complex, [MoO2(acac)2] in presence of DMSO or DMF. The synthesized aroylhydrazones and their molybdenum complexes were characterized by elemental analysis, spectroscopic techniques (FT-IR, UV–Vis, 1H NMR) and conductivity measurements. Finally the three dimensional structures of the complexes were confirmed by single crystal X-ray diffraction studies. Crystal structures of 1, 2 and 3 were solved by direct methods and refined with full-matrix least-squares calculations using the SHELXS97 and SHELXL2014 software programs respectively. Complex 1 got crystallized in monoclinic space group, P21/c with Z = 4, whereas complexes 2 and 3 in triclinic space group, P\(\overline {1}\) with Z = 2. The ligands, H2L1−3 showed coordination to the metal ion in a dibasic tridentate manner through deprotonated phenolate oxygen, azomethine nitrogen and enolate oxygen.

Graphical Abstract

All the three dioxidomolybdenum(VI) complexes exhibit a distorted octahedral geometry around molybdenum atom. ORTEP plot of [MoO2L2(H2O)]·DMF. (Displacement ellipsoids are drawn at 50% probability)


Aroylhydrazones Molybdenum complexes X-ray diffraction studies Crystal structure Azomethinenitrogen 



The authors thank the Cochin University of Science and Technology, Kochi, India for financial assistance and thankful to the Sophisticated Analytical Instrumentation Facility, Cochin University of Science and Technology, Kochi, India for elemental ananlysis, 1H NMR and Single crystal X-ray diffraction measurements.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Applied ChemistryCochin University of Science and TechnologyKochiIndia
  2. 2.Department of Chemistry, School of Physical SciencesCentral University of KeralaKasaragodIndia

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