A multifunctional Cd-based coordination polymer based
on a viologen
derivative and a secondary carboxylic ligand, namely, {[Cd2(bcbp)(pta)2 (H2O)]·2H2O}
n
(1, H2bcbpCl2 = 1,1′-bis(4-carboxyphenyl)-(4,4′-bipyridinium)
dichloride, H2pta = p-phthalic acid),
has been solvothermally synthesized and structurally characterized.
Compound 1 is a 3D framework built on {Cd2(pta)2 (H2O)}
n
net
with square channels which intalls bcbp ligands at the diagonal position
of the two adjacent square channels. Notably, compound 1 exhibits a reversible photochromic transformation between yellowish
gray and dark green under xenon light irradiation, which should be
attributed to the formation of free viologen radicals. Furthermore,
compound 1 also displays a chemochromic phenomenon from
yellowish gray to dark green after exposure to ammonia and hydrazine,
which could be ascribed to the generation of viologen radicals and
charge-transfer complexes triggered by nucleophilic attack of electron-rich
ammonia and hydrazine molecules to the electron-deficient viologen
moiety in the bcbp ligand. Moreover, compound 1 is capable
of quickly and selectively detecting MnO4
– with a high quenching coefficient and a low limit of detection via
a luminescent quenching process caused by the competitive absorption
of excitation energy.
A novel Cd-based cationic coordination polymer featuring a thirteen-fold interpenetrating dia network exhibits selective coloration and ion-controlled photochromism towards halide anions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.