Thermochromism of the disproportionation equilibrium of pi-dimer radical anion complexes bridged by scandium ions.
Semiquinone radical anion (Q(*-)) forms a stable pi-dimer with neutral p-benzoquinone (Q), bridged by two or three scandium ions (Sc(3+)) to afford Q(*-)-nSc(3+)-Q (n= 2,3), which is in disproportionation equilibrium with Q and hydroquinone (QH(2)). The number of binding scandium ions changes depending on temperature, causing a remarkable color change associated with the change in the ESR spectra.
Yuasa
Junpei
J
Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Corporation, Suita, Osaka 565-0871, Japan.
Fukuzumi
Shunichi
S