Search

Although phase transition materials (PTMs) under external stimuli are of great research interest duo to their rich potential applications, it is still challenging to explore multi-responsive PTMs. Herein, two different phases of organic-inorganic hybrid copper-based halides, α- and β-Gua 3 Cu 2 I 5 (Gua + =CN 3 H 6 + ), were synthesized by solvent evaporation method, which they crystalize in the noncentrosymmetric space group Fdd2 with zero-dimensional structure and centrosymmetric space group C2/c with one-dimensional metal-halogen framework, respectively. Interestingly, it is firstly demonstrated that Gua 3 Cu 2 I 5 simultaneously possesses reversible PL conversion and NLO switching properties in response to thermal stimulus. Strikingly, apart from heat, its structural phase transition can also be triggered by crystalline-phase-recognition (CPR) and mechanical force. These new findings may pave a path for future exploration of PTMs with multiple physical properties., (© 2023 Wiley-VCH GmbH.)

A series of pentanary chalcogenoborates (A 3 X)[InB 12 (InQ 4 ) 3 ] (A = K, Rb, Cs; X = Cl, Br, I; Q = S, Se) were obtained by high-temperature solid-state reactions. These salt-inclusion chalcogenides crystallize in the hexagonal space group P 6 3 22, a type of Kleinman-forbidden noncentrosymmetric structure. Their structures feature a [InB 12 (InQ 4 ) 3 ] open framework built by InQ 6 octahedra and InQ 4 tetrahedra consolidated B 12 cluster, which accomodates octahedral cavities for XA 6 units. They are second-harmonic generation active, and their optical properties were studied experimentally and theoretically. This work can evoke more interest in chalcogenoborate-based second-order nonlinear optical materials.