Phosphine stabilized copper(I) complexes of dithiocarbamates and xanthates and their decomposition pathways

Phosphine stabilized compounds [Cu(I)(S2CNEt2)PR3](2) (1-3) (R = OMe, Me and Et, respectively) and [Cu(I)(S2COEt) PR3](2) (4, 5), (R = OMe, and Me, respectively) have been prepared and characterised. The structures of compounds (1-3) were determined by X-ray single crystallography. The structures of all three compounds are based on centro-symmetric dimers which crystallise in the monoclinic space group P2(1)/n with two [Cu(I)(S2CNEt2)PR3](2) molecules per unit cell. The thermal decomposition of selected complexes was investigated by thermogravimetric, differential scanning calorimetry and gas chromatography with mass spectroscopy to understand the possible decomposition pathways.