The synthesis and spectral features of some cationic manganese(I) and rhenium(I) tricarbonyl complexes

Abstract

More than twenty cationic manganese or rhenium tricarbonyl complexes of the types fac-[M(CO) 3L 3]ClO 4 (L = C 5H 5N or ethylenethiourea; L 3 = tri-2pyridylamine, diethylenetriamine or E-pyridine-2-carbaldehyde-2′-pyridylhydrazone), fac-[M(CO) 3X 2Y]ClO 4 (X 2 = 2 C 5H 5N, 2,2′-bipyridyl, di-2-pyridylamine, 2 PPh 3, Ph 2PCH 2PPh 2, Ph 2PCH 2CH 2PPh 2, Ph 2PCH 2CH 2AsPh 2, or Ph 2AsCH 2CH 2AsPh 2; Y = MeCN), or fac-[M(CO) 3XY 2]Cl04 (X = AsPh 3; Y= MeCN) have been prepared by displacement of acetonitrile groups from fac-[M(CO) 3(NCMe) 3]ClO 4. The dicarbonyl cationic complex [Mn(CO) 2(PPh 3) 2(NCMe) 2]ClO 4 has also been synthesised. The compounds have been characterised by conductivity measurements, and by infrared (4000-40 cm −) and 1H and 31P NMR spectroscopy. Trends in Cotton-Kraihanzel CO stretching parameters are discussed.