Two novel isomeric Cd-viologen coordinationpolymers [Cd(CV)0.5·(p-BDC)·H2O] (1) and [Cd(CV)0.5·(m-BDC)·H2O] (2) (CV= N,N′-4,4′-bipyridiniodipropionate, p-BDC2− = terephthalate, m-BDC2− = isophthalate) have been successfully assembled and well characterized. Compounds 1 and 2 have the same empirical formula but different structures. Isomer 1 exhibits a 3D structure, while compound 2 exhibits a 1D channel
region while increasing its conductance and photoconductance. This work is the first to modify the photoconductance of semiconductors by PIET. The observed increasing times of conductivity reached 3 orders of magnitude, which represents a record for photoswitchable semiconductors. The increasing photocurrent comes mainly from the semiconducting organic π-aggregates, which indicates a chance to improve
A photochromic compound with fast response to Mo-Kα (4 min) and Al-Kα (1 s) X-rays was synthesized using a cluster of high-Z atoms and a flexible viologen zwitterion. The coloration time of 1 s when exposed to soft X-rays is the recorded minimum for X-ray-inducedphotochromicmaterials, indicating a potential to detect low-energy X-rays.
The coordination compound [Zn2LCl4]n (ZnLCl) showed greater moisture stability and faster color change than the viologen ligand L (N,N′-dipropionate-4,4′-bipyridinium).