In search of molecular precursors for cadmium sulfide-new complexes with a sulfur-rich kernel: cadmium(II) tri-tert-butoxysilanethiolates with additional diethyldithiocarbamato ligand

摘要

The reaction of dimeric bis(tri-tert-butoxysilanethiolato)cadmium(II) [Cd{SSi(OBut)(3)}(2)](2) 1 with diethyldithiocarbamate sodium salt in the presence of quaternary ammonium salts resulted in formation of three new heteroleptic cadmium(II) complexes-the first silanethiolate species possessing additionally other S-donor ligands. Neutral 2 as well as ionic compounds 3 and 4 can be obtained with a good yield depending on the quaternary salt and solvent used. Their X-ray structures have been determined-complex [Cd{SSi(OBut)(3)}(S2CNEt2)](2) 2 turned out to be dimeric in the solid state, while 3 and 4 are monometallic species with a [Cd{SSi(OBut)(3)}(2)(S2CNEt2)](-) anion. The cadmium atom in each case has been found tetra-coordinated with a distorted CdS4 kernel. Elemental and spectral analyses (IR, NMR, UV-vis) were carried out. Thin films of 2 and 3 prepared on SiO2 substrates via spin coating technique were analysed by AFM and XPS. The thermal decomposition product of 2 was analysed using XRD, EDS, SEM and TEM measurements and identified as hexagonal CdS.