Halogen Oxidation and Nitrosylation of Mixed Ligand Molybdenum and Tungsten Tricarbonyls

Department of Chemistry, University of Gorakhpur, Gorakhpur-273 001

(L-L)(Ph₃E)Mo(CO)₂ (L-L=o-phen or 2,2'-bipy; E=As or Sb) after bromine or iodine oxidation yield [(L-L)(Ph₂E)Mo(CO)₂XIX(X=Br, I) derivatives. Under similar conditions Ph₃P is displaced & rom (L-L)(Ph₂ P)Mo(CO). to produce dimeric (L-L)Mo(CO)₂X.. Chlorine swept benzene displaces both CO and Ph₂P from (L-L)(Ph₂P)Mo(C0)₂ and only CO from (L-L)(Ph₂ E)Mo,CO₂). to yield (L-L)MoC14 and [(L-L)(Ph, E)MoCI₂]CI₂ respectively. Nitrosylation of (L-L)(Ph₃E')M(CO)₃ (M =Mo, W; E'=P. As, Sb) using NOCI gives a mixture of (L-L)M(NO)₂ CI₂ and [(L-L)M(CO)₂(NO)₂CI)CI; while [(L-L)M(CO)₂ (NO)₂. derivatives are recovered when free NO is used. The complexes have been characterised by elemental analysis, ir, conductivity and magnetic measurements.