A combined electrochemical quartz-crystal microbalance probe beam deflection (EQCM-PBD) study of solvent and ion transfers at a poly[Ni(saltMe)]-modified electrode during redox switching
M. Vilas-boas et al., A combined electrochemical quartz-crystal microbalance probe beam deflection (EQCM-PBD) study of solvent and ion transfers at a poly[Ni(saltMe)]-modified electrode during redox switching, CHEM-EUR J, 6(7), 2000, pp. 1160-1167
The oxidative polymerisation of the complex2,3-dimethyl-N,N'-bis-(salicylid
ene)butane-2,3-diaminatonickel(II), [Ni(saltMe)], was monitored by the elec
trochemical quartz microbalance (EQCM) and crystal impedance techniques. Po
lymerisation efficiency was maintained throughout deposition of a film, whi
ch behaved rigidly, on the electrode. A combined EQCM-PBD (probe beam defle
ction) study of the redox process of the film exposed to a monomer-free sol
ution of 0.1 M tetraethylammonium perchlorate (TEAP) in acetonitrile showed
an electroneutrality mechanism dominated by anion movement accompanied by
co-transfer of solvent above 0.8 V. The individual contributions of all the
mobile species involved in the redox switching of the poly[Ni(saltMe)] fil
m were determined quantitatively by temporal convolution analysis; the esti
mated solution-phase diffusion coefficient of the exchanged species was 1.2
4 x 10(-5) cm(2) s(-1).