2-(N,N-Dimethylamino)ethylselenolates of cadmium(II): Syntheses, structure of [Cd3(OAc)2(SeCH2CH2NMe2)4] and their use as single source precursors for the preparation of CdSe nanoparticles

The reaction of Cd(OAc) 2  · 2H 2 O with NaSeCH 2 CH 2 NMe 2 gave a homoleptic cadmium selenolate, [Cd(SeCH 2 CH 2 NMe 2 ) 2 ]. The latter complex, on treatment with Cd(OAc) 2  · 2H 2 O, afforded [Cd 3 (OAc) 2 (SeCH 2 CH 2 NMe 2 ) 4 ], which was structurally characterized by single-crystal X-ray diffraction analysis. Pyrolysis of [Cd(SeCH 2 CH 2 NMe 2 ) 2 ] either in a mixture of hot hexadecylamine (HDA) and tri- n -octylphosphine oxide (TOPO) or in a furnace (180 and 200 °C) gave CdSe nanoparticles with average sizes varying between 3 and 21 nm. Both cubic and hexagonal phases of CdSe nanoparticles have been isolated under different experimental conditions. The CdSe nanoparticles were characterized by UV–Vis, photoluminescence, X-ray diffraction and electron microscopy. Time resolved luminescence measurements showed three different decay times for both band edge and trap state emissions.

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