Crystal structures, phase transitions, and nuclear magnetic resonance of organic-inorganic hybrid [NH 2 (CH 3 ) 2 ] 2 ZnBr 4 crystals.

Organic-inorganic hybrid [NH 2 (CH 3 ) 2 ] 2 ZnBr 4 crystals were grown via slow evaporation, and their monoclinic structure was determined using single-crystal X-ray diffraction (XRD). The two phase transition temperatures at 401 K ( T C1 ) and 436 K ( T C2 ) were defined using differential scanning calorimetry and powder XRD. In the nuclear magnetic resonance spectra, a small change was observed in the 1 H chemical shifts for NH 2 , 13 C chemical shifts for CH 3 , and 14 N resonance frequency for NH 2 near T C1 . 1 H spin-lattice relaxation times T 1ρ and 13 C T 1ρ for NH 2 and CH 3 , respectively, rapidly decreased near T C1 , suggesting that energy was easily transferred. NH 2 in the [NH 2 (CH 3 ) 2 ] + cation was significantly influenced by the surrounding environments of 1 H and 14 N, indicating a change in the N-H⋯Br hydrogen bond with the coordination geometry of the ZnBr 4 anion. These fundamental properties open efficient avenues for the development of organic-inorganic hybrids, thus qualifying them for practical applications.