Synthesis of some molybdenum(v) and tungsten(V) complexes of 1-aryl-2,5- dithiohydrazodicarbonamides

Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi-221 005, India

E-mail: rastogi@bhu.ac.in Fax: 91-542-2368428

Manuscript received 1 April 2003, revised 23 September 2004, accepted 2 February 2005

Molybdenum and tungsten complexes of the type M₂O₄L₂ (H₂O)₂ [where M = Mo^V, W^V, LH = 1-phenyl-2,5- di thiohydrazodicarbonamide (PTHCH), 1-p-methyI phenyl-2,5-di thiohyd razodicarbonamide ( MeOPTHCH), 1-p-methoxyphenyl- 2,5- dithiohydrazodicarbronamide (MePTHCH), 1-p-chlorophenyl-2,5 -dithiohydrazodicarbonamide (CIPTHCH)] have been synthesized. The complexes are non-ionic and diamagnetic in nature. Although the complexes are ESR inactive, +5 oxidation state of the metal ions in octahedral geometry has been suggested. IR and electronic spectral studies indicate dinuclear-type of complexes with M₂O²⁺₄ moiety. Monoanionic bidentate mode of bonding for all the ligands is suggested. X-Ray powder diffraction of the complexes exhibits amorphous nature of the complexes.