Molecular packing, crystal to crystal transformation, electron transfer behaviour, and photochromic and fluorescent properties of three hydrogen-bonded supramolecular complexes containing benzenecarboxylate donors and viologen acceptors

Abstract

Structures of three D–A supramolecular systems and their photoresponsive characteristics are investigated.

A Multifunctional MnII Phosphonate for Rapid Separation of Methyl Orange and Electron‐Transfer Photochromism

“…It is noteworthy that LLCT photochromic MOFs are rare, and those with non‐photochromic components are even scarcer . Moreover, most photochromic MOFs have been based on Zn II and Cd II ions;,– to the best of our knowledge this is the example built from Mn II ions.…”

“…In contrast, less attention has been paid to elaborate photochromic MOFs with non‐photochromic organic ligands, and ILCT or LLCT photochromic MOFs without photochromic components are rather rare . In addition, reported photochromic materials have been mainly based on Zn II and Cd II as the metal ions,,– whereas those built from Mn II ions have not hitherto been reported.…”

Synthesis, crystal structures and sensitivity to sunlight of two Ag (I) photoresponsive metal–organic complexes

“…Irradiation of pure title compound 1 by sunlight for 3 min induces intense photochromism from yellowishbrown to green in the solid state, and color reversion is accomplished by heating. Comparably, compound 2 is rather photosensitives and can give an eye-detectable change from yellow to green upon exposure to sunlight in air within 10 s. It shows thermally irreversible and can be stable in the colored form, which is a potential functional material that can convert solar energy into useful chemical energy [7].…”

Metal–organic framework bearing new viologen ligand for ammonia and Cr2O72− sensing

“…At the same time, MOFs designed based on viologen have advantages in chemical sensing/switching and other elds, and their response characteristics can be adjusted by the organization of the D-A block. 1,2,14,15,17,[28][29][30][31][32][33][34][35][36] Ammonia (NH 3 ) is an important industrial raw material with a wide range of uses, but it is also a highly toxic chemical. And even at low concentrations, there is a certain degree of toxicity.…”