LASER ION-BEAM PHOTODISSOCIATION STUDIES OF IONIC CLUSTER FRAGMENTS OF IRON CARBONYLS - FE1-3 (CO)0-6+
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Ionic cluster fragments of the type Fex(CO)y+(x = 1-3; y = 06) are mass resolved by high-resolution mass spectrometry (R = 7500) and then photodissociated. The photofragment ions are mass analyzed by an electrostatic analyzer. The ions studied include Fe(CO)y+(y = 15), Fe2(CO)y+(y = 06), and Fe3(CO)y+(y = 04) derived from Fe3(CO)12neutral. Relative photofragment ion yields for each photodissociating ion and upper and lower limits to the average bond dissociation energies for both Fe+-CO and Fe+-Fe bonds are reported. Average metal-ligand binding energies in the range 19.5-58.6 kcal/mol are measured for iron-carbonyl bonds. The photodissociation threshold for Fe3+ Fe2+ + Fe is found to be <27.8 kcal/mol. The Fe2+ ion does not photodissociate over the wavelength range (458-514.5 nm), placing the lower limit for the bond dissociation energy at <62.4 kcal/mol. 1988, American Chemical Society. All rights reserved.