Oxomolybdenum(VI) and (IV) complexes of pyrazole derived ONO donor ligands – synthesis,crystal structure studies and spectroelectrochemical correlation |
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| Authors: | Samik Gupta Anil Kumar Barik Sachindranath Pal Arijit Hazra Somnath Roy Ray J Butcher Susanta Kumar Kar |
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| Institution: | 1. Department of Chemistry, University College of Science, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, West Bengal, India;2. Department of Chemistry, St. Paul’s C.M. College, 33/1, Raja Rammohan Roy Sarani, Kolkata 700 009, West Bengal, India;3. Department of Chemistry, Sree Chaitanya College, Habra, North 24 Parganas, West Bengal, India;4. Department of Chemistry, Howard University, 2400 Sixth Street, N.W., Washington, DC 200 59, USA |
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| Abstract: | Four cis-dioxomolybdenum complexes of general formula MoO2(Ln)EtOH] (n = 1–4) and one oxomolybdenum(IV) complex MoO(L4)EtOH], with potentially tridentate Schiff bases derived from 5-methyl pyrazole-3-carbohydrazide and salicylaldehyde/substituted salicylaldehyde/o-hydroxy acetophenone have been prepared. The Mo(IV) complex is derived from the Mo(VI) dioxo complex by oxotransfer reaction with PPh3. The complexes are characterized by elemental analysis, electronic spectra, IR, 1H NMR, and by cyclic voltammetry. All the Mo(VI) species are crystallographically characterized. The complexes have a distorted octahedral structure in which the ligand behaves as a binegative donor one, leaving the pyrazole –N uncoordinated towards the metal center. It is also revealed from the crystal structure that the Mo(VI) center enjoys an NO5 donor environment. |
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| Keywords: | Dioxomolybdenum(VI) Oxomolybdenum(IV) Oxotransfer reaction Pyrazole derived Schiff base ligands Crystal structure Structural correlation |
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