Coordination Complexes of Some Group (IV) Halides. Preparation and Infrared Spectra of the Complexes of Group(IV) Halides with 1-Methyl-2 pyrrolidinone and Biuret as Ligands

Chemistry Division Bhabha Atomic Research Centre, Trombay, Bombay-85

Manuscript received 17 July 1975; accepted 13 September 1976

Coordination complexes resulting from the interaction of group(IV) halides, MX₄ (where M=Ti, Sn or Zr and X=CI or Br) with 1-methyl-1 pyrrolidillone(L) and biuret (BT) as ligands have been prepared and characterized. The compounds have been examined spectrophotometrically in the infrared (i. r.) region 4000-650 cm^-1 to establish the possible coordination sites. The analytical results Indicate that with TiCl₄ the ligand 'L' forms both 1:1 and 1:2 adducts whereas with SnCI₄ and ZrCl₄ only 1:1 adducts are formed. In the case of the ligand BT only 1:1 adducts have been obtained in each case.

An attempt to brominate some of the tetrachloro-complexes such as TiCl₄.L, TiCI₄.2L and TiCI₄.BT, by reacting with an excess of BBr₃ has resulted in the formation of interesting mixed halide complexes such as TiCl₂Br₂.L.BBr₃ , TiCI₂Br₂.2L.2BBr₃, TiCI₂Br₂.BT and tetrabromo-complex of the type TiBr₄.2L.2BBr₃.