Crystal structure of 2-(azaniumylmethyl)pyridinium bis(hydrogen squarate)

Abstract

The structure of the title squarate salt is reported. Classical N—H⋯O and O—H⋯O hydrogen bonds combine with weak C—O⋯π(ring) and π–π contacts to stabilize the crystal packing.

New Low-Dimensional Lead-Free Perovskite (2-AMP)2BiX7·H2O (X = Cl, Br) Crystals: Synthesis, Stability, and Nonlinear Optical Properties

“…Therefore, two new low-dimensional lead-free perovskite bulk crystals, (2-AMP) 2 BiX 7 ·H 2 O (2-AMP = 2-amine-methylpyridinium; X = Cl, Br), with NSC structures and high stability were prepared using a slow evaporation method. It should be pointed out that in virtue of 2-AMP cations, lots of compounds with perovskite − and non-perovskite structures − have been reported. However, only (2-AMP)­SbI 5 and (2-AMP)­(ClO 4 ) 2 demonstrate NCS structures; their ferroelectric properties are systematically studied, whereas the detailed investigations on NLO properties are limited.…”