Studies of adducts of main group organometallic compounds by Fourier transform Raman spectroscopy

Abstract

Fourier transform (FT)-Raman spectroscopy has been used to study species that play a part in Metal Organic Vapour Phase Epitaxy (MOVPE). These compounds include N-donor adducts of (CH 3) 2Cd and (CH 3) 3Ga and the dimeric species [(CH 3) 2GaN(CH 3) 2] 2 which is a likely intermediate in the thermal production of the wide band gap semi-conductor GaN from (CH 3) 3Ga.N(CH 3) 2H. A search using FT-Raman spectroscopy for possible adducts of (CH 3) 2Cd and (C 2H 5) 2Cd with Te-donor molecules is also described. It is found that FT-Raman spectroscopy with near-infrared excitation is a particularly suitable method for studying adducts containing nitrogen heterocycles which show strong fluorescence under visible irradiation. Thus the Raman spectra of the adducts (CH 3) 2Cd.2,2′-bipyridyl and (CH 3) 2Cd.1,10-phenanthroline, which are bright yellow, have been measured.