crystals were stable up to 600 K. The nuclear magnetic resonance spectra, obtained using the magic-angle spinning method, demonstrated changes in the 1H and 13C chemical shifts were observed near TC1, indicating changing structural environments around 1H and 13C. The spin–lattice relaxation time, T1ρ, increased rapidly near TC1 suggesting very large energy transfer, as indicated by a large thermal displacement
有机-无机杂化[NH 3 (CH 2 ) 6 NH 3 ]ZnBr 4晶体采用慢速蒸发法制备;晶体具有单斜晶结构,空间群为P 2 1 / c,晶格常数a = 7.7833 Å,b = 14.5312 Å,c = 13.2396 Å,β = 90.8650°,Z = 4。它们经历了两次相变,在 370 K ( T C1 ) 和 430 K ( T C2),由不同温度下的粉末 X 射线衍射图证实;晶体在高达 600 K 时仍保持稳定。使用魔角旋转法获得的核磁共振光谱表明,在T C1附近观察到1 H 和13 C
化学位移的变化,表明在1 H和13附近的结构环境发生了变化C. 自旋晶格弛豫时间T 1ρ在T C1附近迅速增加,表明能量转移非常大,如阳离子的13 个C 原子周围的大热位移所示。然而,1 H 的环境,14 N和靠近NH 3的[NH 3 (CH 2 ) 6 NH 3 ]阳离子中C1对其没有