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.
Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Corporation, Suita, Osaka 565-0871, Japan.
Junpei
J
Yuasa
Shunichi
S
Fukuzumi