Accommodative Behavior of Non-porous Molecular crystal at Solid-Gas and Solid-Liquid Interface

Abstract

Molecular crystals demonstrate drastically different behavior in solid and liquid state, mainly due to their difference in structural frameworks. Therefore, designing of unique structured molecular compound which can work at both these interfaces has been a challenge. Here, we present remarkable ‘molecular’ property by non-porous molecular solid crystal, dinuclear copper complex (C6H5CH(X)NH2)2CuCl2, to reversibly ‘adsorb’ HCl gas at solid-gas interface as well as ‘accommodate’ azide anion at solid-liquid interface with crystal to crystal transformation. The latter process is driven by molecular recognition, self-assembly, and anchimeric assistance. The observed transformations are feasible due to breathing of inner and outer coordination sphere around metal center resulting in change in metal polyhedra for ‘accommodating’ guest molecule. These transformations cause changes in optical, magnetic, and/or ferroelectric property offering diversity in ‘sensing’ application. With the proposed underlying principles in these exceptional reversible and cyclic transformations, we prepared a series of compounds, can facilitate designing of novel multifunctional molecular materials.

Two Consecutive Magneto-Structural Gas-Solid Transformations with Single-Crystal Retention in Non-Porous Molecular Materials

“…[15] This approach has subsequently been successfully applied to other systems. [16][17][18] In these magnetic crystalline materials, the desired long structural order is preserved despite the rearrangement suffered, including cleavage and formation of covalent bonds, albeit the single crystal nature of the solid is typically lost, thus resulting in polycrystalline powders. Indeed, magnetic materials that show single-crystal-to-single-crystal (SCSC) transformation are tremendously valuable for understanding the mechanism of the transformation and the magnetostructural correlations, but are extremely scarce.…”

Two Consecutive Magneto-Structural Gas-Solid Transformations with Single-Crystal Retention in Non-Porous Molecular Materials

“…[15] This approach has subsequently been successfully appliedt oo ther systems. [16][17][18] In these magnetic crystalline materials, the desired long structural order is preserved despite the rearrangement suffered, including cleavage and formationo fc ovalentb onds, although the single crystal nature of the solidi st ypically lost, thus resulting in polycrystalline powders. Indeed, magnetic materials with structures unequivocally characterized by single-crystal diffraction after ac hemical reaction are tremendously valuable for understanding the mechanism of the transformation and the magnetostructural correlations,but are extremely scarce.…”