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Oxomolybdenum(VI) and (IV) complexes of pyrazole derived ONO donor ligands – synthesis, crystal structure studies and spectroelectrochemical correlation

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Title: Oxomolybdenum(VI) and (IV) complexes of pyrazole derived ONO donor ligands – synthesis, crystal structure studies and spectroelectrochemical correlation
Authors: Gupta, Samik1, Barik, Anil Kumar2, Pal, Sachindranath3, Hazra, Arijit1, Roy, Somnath1, Butcher, Ray J.4, Kar, Susanta Kumar1 skkar_cu@yahoo.co.in
Source: Polyhedron. Jan2007, Vol. 26 Issue 1, p133-141. 9p.
Subjects: Linear algebra, Schiff bases, Spectrum analysis, Electrochemical analysis
Abstract: Abstract: Four cis-dioxomolybdenum complexes of general formula [MoO2(L n )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. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Four cis-dioxomolybdenum complexes of general formula [MoO2(L n )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. [Copyright &y& Elsevier]
ISSN:02775387
DOI:10.1016/j.poly.2006.08.001