2004 Volume 77 Issue 12 Pages 2199-2202
The 1H NMR spin–lattice relaxation times and the second moments of the resonance linewidth were measured as a function of temperature in (C2H5NH3)2[ZnBr4]. The crystal structure at 295 K was determined to be orthorhombic with space group of P212121 by the single-crystal X-ray diffraction method. The crystal undergoes a 1st order structural phase transition at Tc = 300 K, which is driven by the disordering of cationic orientations. The crystal structure above Tc is inferred to be orthorhombic with space group of Pmnb().
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