Molecular rotators anchored on a rod-like anionic coordination polymer adhered by charge-assisted hydrogen bonds

Abstract

On the basis of variable-temperature single-crystal X-ray diffraction, variable-temperature/frequency dielectric analysis, variable-temperature solid-state nuclear magnetic resonance spectroscopy, and molecular dynamics simulation, here we present a new model of crystalline supramolecular...

Temperature-tunable multiple dielectric switch in hybrid rare-earth perovskites regulated by hierarchical guest dynamics, lanthanide contraction and doping

“…Here we adopt (Me 2 HC–NHMe 2 ) + , i.e. (i-PrNHMe 2 ) + cation, which exhibits a flexible “C–N” core with a highly variable torsion angle θ H–N–C–H , as a conformationally flexible sphere-like guest, 46–48 to induce stepwise phase transitions in the hybrid rare-earth perovskite system. With this strategy, we synthesized a series of hybrid rare-earth perovskites composed of trivalent rare-earth ions and monovalent alkali Rb + ions, namely, (i-PrNHMe 2 ) 2 [RbLn(NO 3 ) 6 ] (Ln = La, 1 ; Ce, 2 ; Nd, 3 ; Sm, 4 ).…”