Postsynthetic Crystalline Transformation in Two-Dimensional Perovskites via Organothiol-Based Chemistry

The first postsynthetic solution-based crystal transformation of two-dimensional metal halide perovskites (2D MHPs) through organothiol-based reactions is reported. It is well-established that the crystal formation from a solution containing pre-designed metal ion and organic cation precursors produces well-defined 2D MHPs with various intercalating organic cations. However, few reports outlining the postsynthetic crystal transformation of 2D MHPs have appeared. Here, we report that, upon organothiol-based redox or condensation reactions, large organic cations in three types of 2D MHPs can interconvert under ambient conditions without damage to the layered inorganic framework. The swift and complete crystal interconversion has been confirmed using combined techniques including X-ray diffraction and C-13 nuclear magnetic resonance (C-13 NMR) spectroscopy. Electronic structures of the MHPs were investigated using computational chemistry. [GRAPHICS] .