A multi-functional iodoplumbate-based hybrid crystal: 1-propyl-4-aminopyridinium triiodoplumbate

Abstract

The temperature-dependent photoluminescence, dielectric and impedance spectra, as well as crystal structures have been investigated for the iodoplumbate-based hybrid crystal, [C₃-Apy][PbI₃] (1) (C₃-Apy⁺ = 1-propyl-4-aminopyridinium). Compound 1 in the room temperature (RT) contains [PbI₃]_∞ chains formed by face-sharing distorted PbI₆ octahedral. In the low-temperature (LT) phase, the disordered propyl groups in HT phase are partly ordered. 1 shows novel dielectric relaxation and thermochromic luminescent properties.