Chemistry Reference
In-Depth Information
O
O
1-x
O
O
O
N
OCH
3
O
NO
2
N
CH
3
CH
3
The crowned spiropyran in the electrically neutral form can bind an alkali metal ion with the crown
ether moiety. At the same time, the spirobenzopyran portion isomerizes to the corresponding
merocyanine form photo-chemically. The zwitterionic merocyanine form of crowned spirobenzopyran
moiety brings about a significant change in the metal-ion binding ability. This prompted the authors to
apply the compound to photo-responsive ion-conductive materials. They observed that the ion-
conductivity was increased by ultraviolet light and decreased by visible light [
259
].
Chan and coworkers [
269
] prepared polystyrenes and poly(methyl methacrylate)s that contain
metal complex cores:
O
O
M
n
n
H
H
O
O
=
M
OC
Re
Cl
OC
CO
H
H
2PF
6
O
O
Ru
M
or
=
N
N
