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