Solvent-Dependent Iodoargentate Hybrids: Syntheses, Structural Diversity, Thermochromism, and Photocatalysis

摘要

Charge-balanced by protonated pyridine, four iodoargentate hybrids, [(Hpy)(Ag2I3)](n) (1, 2D), {[(Hpy)(2)dmf][Ag6I8]}(n) (2, 2D), {[(Hpy)(2)H2O][Ag3I5]}(n) (3, 1D) and [(Hpy)(Ag5I6)](n) (4, reported 3D) (Hpy(+) = protonated pyridine, dmf = N,N-dimethylformamide), were synthesized in the system comprising pyridine/AgI/HI/solvent (solvent: acetone for 1, DMF for 2, acetone/H2O for 3, and acetonitrile for 4). Structural analysis revealed the significant influence of the solvent on the assembly and crystallization of the iodoargentate hybrids. Noteworthy, compounds 2-4 reveal a good structural match between the structure-directing agents and the inorganic frameworks. The band gaps of 1-4 (2.93, 3.05, 2.99, and 2.71 eV for 1, 2, 3, and 4, respectively) also exhibit an intense correlation between the structural features of the hybrids and their photocatalytic properties in the degradation of rhodamine B under UV-light irradiation. Moreover, compound 4 shows interesting thermochromism owing to its temperature-dependent intermolecular charge transfer.