Diorganosilicon(iv) Complexes of Heterocyclic Dithiocarbamates. Synthesis and Structural Elucidations

Abstract

Diorganosilicon(IV) complexes of heterocyclic dithiocarbamates having general formula [CH 2 CH 2 (X)CH2CH2NCS2] 2 SiR2(where R = CH 3 , X = CH 2 , CH-CH 3 and R = C 6 H 5 , X = CH 2 , CH-CH 3 , O) have been synthesized by the interaction of diorganodichlorosilicon with the sodium salt of heterocyclic dithiocarbamates in a 1 : 2 stoichiometric ratio. The resulting complexes were characterized by elemental analysis, molecular weight measurements and a tetracoordinated geometry around silicon atom has been proposed on the basis of IR and. NMR ( 1 H, 13 C and 29 Si) spectral studies. IntroductionOrganosilicon compounds of ligands containing sulphur donor atoms have attracted attention due to their biological importance [1][2][3][4], The sulphur-containing ligands are well known for their anticarcinogenic [5], antibacterial [6], tuberculostatic [7] and antifungal [8] activities.Heterocyclic dithiocarbamates constitute an important class of sulphur donor ligands which show pronounced biological activities [9][10][11], In continuation to our work on heterocyclic dithiocarbamates of group IV organometallics [12][13][14], we report the synthesis and characterization of diorganosilicon derivatives of these ligands.

Main Group Dithiocarbamate Complexes

“…Although silicon dithiocarbamate complexes remain rare, complexes of the type [SiR 2 (S 2 CNR 2 ) 2 ] (R ¼ Me or Ph) have been reported recently (82). Spectroscopic data for the complexes (IR and NMR) have been interpreted in terms of a tetracoordinate silicon atom, with the two dithiocarbamate ligands monodentate.…”