Preparation and characterization of some transition metal complexes with crotyl xanthate ligand and their adducts with nitrogen bases

الملخص EN

Xanthates and related ligands as well as transition-metal complexes in which a 1,1-dithiolate ligand forms a four-membered ring with the metal ion have been extensively investigated (Coucouvanis, 1970).

1,1- dithiolate ligands found many applications ranging from flotation agents to radical polymerization (Haiduc, 2007 ; Coote and Radom, 2004 ; Wan et al., 2005 ; Tiekink and Haiduc, 2005).

Xanthate ligands [ROCS2] are known to coordinate metal centers in a variety of coordination modes, e.g.

monodentate, bidentate chelating or bridging (Haiduc, 2003).

The ligands can be easily prepared and their properties can be suitably modified by the appropriate choice of the O bound substituents.

Further, the metal xanthate complexes show that the interesting thermal behaviour and thermal decomposition of such complexes can be a useful route to metal sulfides (Hill et al., 1994).

Recently, metal alkylxanthate compounds have been used as synthetic precursors for the generation of metal sulfide nanostructures (Bessergenev et al., 1995 ; Bessergenev et al., 1998; Pradhan et al., 2003).

In view of this, we decided to explore the suitability of crotyl xanthates complexes with Fe (II), Co (II), Ni (II) and Cu (II) as single-source precursors for the preparation of nanocrystalline transition metal sulfide.