Binuclear Dioxomolybdenum(VI) Complexes of Flexibly-Bridged Hexadentate Tetraanionic Schiff’s Bases Derived from Methylene- or Dithio-bis(salicylaldehyde) and S-Methyldithiocarbazate or S-Benzyldithiocarbazate

• Published in: Bulletin of the Chemical Society of Japan Vol. 68; no. 2; pp. 554 - 558
• Main Authors: Maurya, Mannar R, Antony, Deena C, Gopinathan, Sarada, Gopinathan, Changaramponnath
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.02.1995; Chemical Society of Japan
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.68.554

The flexibly-bridged hexadentate tetraanionic ligands, LH4 [LH4 = Schiff’s bases obtained by the condensation of methylene- or dithio-bis(salicylaldehyde) with S-methyldithiocarbazate and S-benzyldithiocarbazate], react with [MoO2(acac)2] in a 1 : 2 molar ratio in refluxing methanol to give complexes of the type [(MoO2)2L]. These complexes show an intense ν(Mo=O) band at 924—948 cm−1 and a broad but strong band at ca. 850 cm−1 due to weakened ν → Mo interactions. An oligomeric structure, in which each Mo(VI) ion achieves a pseudo-octahedral structure via M2)2L] reacts with monodentate ligands (D) like pyridine, 4-methylpyridine, and dimethylsulfoxide and forms six-coordinated complexes of the type [(MoO2)2L(D)2] which are monomers. Cyclic voltammetry measurements indicate that these MoVIO2 complexes are resistant to MoIVO reduction. → Mo interactions. An oligomeric structure, in which each Mo(VI) ion achieves a pseudo-octahedral structure via MoO → Mo bridging, has been suggested for these complexes. [(MoO → Mo bridging, has been suggested for these complexes. [(MoO