A variable temperature specular reflectance cell for thin layer spectroelec
trochemistry (SEC) in the infrared and W-Vis regions was employed to study
the reduction of neutral Fe(CO)(3)(eta(4)-NBD) (1) (NBD = 2,5-norbornadiene
) to its radical-anion Fe(CO)(3)(eta(4)-NBD) (1(.-)). Together 1 and 1(.-)
comprise an unusual case where a dynamic contribution to IR spectral featur
es can be observed in one redox state (1),but not the other (1(.-)). (C) 19
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