The equlibrium and the rate constants for axial substitution of [Fe(pc) (demo)X] [pc = phathalocyaninate, dmso = dimethyl sulphoxide, X = pyridine (py) or carbon monoxide] by CO and py, respectively, have been measured at 20 ± 0.5°C in dmso so solvent. These data confirm the low stability and the high lability of the metal-dmso bond. Also metal-to-dmso ?-back bonding seems to operate. Solvent effect are of minor importance. The rate data suggest that the five-co-ordinate intermidate of the dissociative substitution process discimionates to a limited degree between the incoming nucleophiles. Evidence for the formation of a long-lived transient containing two pyridine and one carbon monoxide molecule is given and discussed.
Equilibrium and kinetic study of the reaction between phthalocyaninatoiron(II) and carbon monoxide in dimethyl sulphoxide in the presence of pyridine. Evidence for the formation of a transient
Pennesi;Rossi;
1985
Abstract
The equlibrium and the rate constants for axial substitution of [Fe(pc) (demo)X] [pc = phathalocyaninate, dmso = dimethyl sulphoxide, X = pyridine (py) or carbon monoxide] by CO and py, respectively, have been measured at 20 ± 0.5°C in dmso so solvent. These data confirm the low stability and the high lability of the metal-dmso bond. Also metal-to-dmso ?-back bonding seems to operate. Solvent effect are of minor importance. The rate data suggest that the five-co-ordinate intermidate of the dissociative substitution process discimionates to a limited degree between the incoming nucleophiles. Evidence for the formation of a long-lived transient containing two pyridine and one carbon monoxide molecule is given and discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
