Ion-molecule reaction chemistry of ionic transition-metal carbonyl cluster fragments. 1. Ligand-exchange reactions of chromium carbonyl (Cr2(CO)y+) ions
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The ligand-exchange ion-molecule reaction chemistry of Cr2(CO)y+ ionic transition metal cluster fragments has been investigated by using a two-section ion cell Fourier transform ion cyclotron resonance mass spectrometer. Simple ligand-exchange reactions involving ligand (L) addition followed by metal-ligand (M–CO) bond cleavage (i.e., an associative ligand-exchange mechanism) as well as ligand exchange involving metal-metal cleavage (i.e., addition of L to Cr2(CO)y+ followed by metal-metal bond cleavage) are observed. The branching ratios for reactions involving metal-metal bond cleavage increase as the metal-to-ligand ratio decreases. In addition, the ratio for simple ligand exchange to metal-metal bond cleavage is strongly dependent upon the nature of the reacting ligand (L). These data combined with collision-induced dissociation data for Cr2(CO)y+ ionic cluster fragments suggest that the Cr-Cr bond strength decreases as y is increased; i.e., the Cr–Cr bond order is strongly dependent upon the ligand environment. © 1990, American Chemical Society. All rights reserved.
author list (cited authors)
Sellers-Hann, L., & Russell, D. H.
complete list of authors
Sellers-Hann, L||Russell, DH