THE ELECTROCHROMIC BEHAVIOUR OF LANTHANIDE BISPHTHALOCYANINES: THE ANOMALOUS NATURE OF THE GREEN LUTETIUM SPECIES
- 1 December 1993
- journal article
- research article
- Published by Taylor & Francis in Journal of Coordination Chemistry
- Vol. 30 (3) , 357-366
- https://doi.org/10.1080/00958979308022769
Abstract
Double integration of the electron paramagnetic resonance signal associated with the green form of lutetium bisphthalocyanine in dimethylformamide solution indicates it is a minor species. Magnetic circular dichroism spectroscopy strongly suggests the chromophore is not a radical. These findings are in keeping with the recently resurrected hypothesis [Daniels et al., J. Coord. Chem. (1993) 28, 23–31] that the “electrochromic” color changes observed in lanthanide bisphthalocyanine chemistry are acid-base in nature and not due to oxidation-reduction processes involving the phthalocyanine rings.Keywords
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