81Br NQR Study of [NH3(CH2) n NH3]CdBr4 (n = 4 and 5) and [NH3(CH2) n NH3]ZnBr4 (n = 5 and 6)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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81Br NQR Study of [NH3(CH2) n NH3]CdBr4 (n = 4 and 5) and [NH3(CH2) n NH3]ZnBr4 (n = 5 and 6)

Authors:	Hideta Ishihara Keizo Horiuchi

Institution:	(1) Faculty of Culture and Education, Saga University, Honjo-machi 1, Saga 840-8502, Japan;(2) Faculty of Science, University of the Ryukyus, Nishihara-cho, Okinawa 903-0213, Japan

Abstract:	⁸¹Br NQR frequencies and differential scanning calorimetry (DSC) were measured as a function of temperature. NH₃(CH₂)₄ NH₃]CdBr₄ (1) and NH₃(CH₂)₅NH₃]CdBr₄ (2) showed a doublet and quartet ⁸¹Br NQR spectrum, respectively. NH₃(CH₂)₅NH₃]ZnBr₄ (3) and NH₃(CH₂)₆NH₃]ZnBr₄ (4) exhibited a four-line ⁸¹Br NQR spectrum. From the NQR results, it is inferred that (1) and (2) consist of infinite two-dimensional sheets of corner-sharing CdBr₆ octahedra, whereas (3) and (4) have isolated ZnBr₄]²⁻ tetrahedra. All of the crystals except (1) showed at least one structural phase transition above 380 K.

Keywords:	Br NQR crystal structure molecular structure structural phase transition
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