Heteropoly blues of α-1,2 and α-1,4 isomers of [PV 2 W 10 O 40 ] 5have been prepared by using the electrochemical technique. EPR spectra, measured as a function of temperature over a wide range (20-300 K), are explicable in terms of electronhopping processes in heteropoly blues. Temperature dependence of A || of the isomers suggest that the activation energy for electron hopping is greater for the α-1,4 isomer than the α-1,2 isomer. Other parameters like stability of the blues and intra-molecular electron transfer rate constants are also evaluated using EPR as the tool.
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