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The kinetics of the replacement of dmso in FePc(dmso)2 by piperidine and 11 substituted pyridines, to form FePc(base)2 species, have been studied by stopped-flow techniques. For the first step a linear free energy relationship (LFER) exists between the rate constant for fission of base from FePc(base)(dmso) and the gas phase proton affinity of the base, from bases with low proton affinity (CO) to...