Nicotinic Acid Bromide: a Simple Organic Salt Optical-Electrical Ferroelastic with High Tc

A new ferroelastic organic salt nicotinic acid bromide (N-Br) was connected by hydrogen bonding with nicotinic acid cations via a halogen substitution strategy. It exhibits a ferroelastic phase transition from P2(1)/m to P1 with 2/mF1 Aizu notation with a high Curie temperature (T-c) of 402 K. Moreover, optical regulation from blue light to white light was achieved by halogen substitution.