Gas phase reactivity of small cationic cobalt clusters towards methanol

The gas phase reactivity of small cationic cobalt clusters, Co-n(+) (n = 1- 12), towards methanol has been investigated using Fourier transform ion cyc lotron resonance mass spectrometry. Sequential addition of methanol molecul es to the clusters was observed to be the dominating process, with the exce ption of Co-4(+) and Co-5(+) for which dehydrogenation of methanol was the dominating initial reaction step. Isotopic labelling studies with CD3OH sho wed that the dehydrogenation is a1,1-elimination reaction involving the met hyl group. Loss of a cobalt atom upon methanol addition was also observed t o be a facile process, being most pronounced for Co-2(+) Co-3(+) and Co-6(). (C) 2000 Elsevier Science B.V. All rights reserved.