Phase transition and crystal dynamics of 4-bromobenzyl alcohol

被引:6
作者
Hashimoto, M [1 ]
Monobe, Y
Terao, H
Niki, H
Mano, K
机构
[1] Kobe Univ, Fac Sci, Dept Chem, Nada Ku, Kobe, Hyogo 6578501, Japan
[2] Univ Tokushima, Fac Integrated Arts & Sci, Dept Chem, Tokushima 7708502, Japan
[3] Univ Ryukyus, Dept Phys, Coll Sci, Okinawa 9030213, Japan
[4] Shinshu Univ, Fac Text Sci & Technol, Dept Kansei Engn, Matsumoto, Nagano 398621, Japan
来源
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 1998年 / 53卷 / 6-7期
关键词
NQR; phase transition; molecular motion; dielectric dispersion;
D O I
10.1515/zna-1998-6-725
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
For the title compound a phase transition from Phase II to Phase I (low and room temperature phases, respectively) was found at ca. 217 K. The temperature dependence of the Br-81 NQR frequency and that of the dielectric constant showed anomalies at ca. 195 K that were tentatively attributed to a higher order phase transition. A similar anomaly was found at ca. 218 K for 4-chlorobenzyl alcohol which showed a II-I transition at 236 K. The dielectric dispersion observed for both compounds at low temperatures indicates an excitation of a molecular motion with the dielectric relaxation rate of ca. 1 kHz. The temperature dependence of the Br-81 NQR frequencies of 2- and 3-bromobenzyl alcohol, measured at T > 77 K, gave no evidence of phase transition in their crystals.
引用
收藏
页码:436 / 441
页数:6
相关论文
共 10 条
  • [1] ZUR THEORIE DER SPIN-GITTERRELAXATION IN MOLEKULKRISTALLEN
    BAYER, H
    [J]. ZEITSCHRIFT FUR PHYSIK, 1951, 130 (02): : 227 - 238
  • [2] *COMP CTR OS U, PROGR PACK MOPAC93 P
  • [3] DAS TP, 1958, NUCL QUADRUPOLE RESO, V1, pCH1
  • [4] DRYDEN JS, 1957, REV PURE APPL CHEM, V7, P15
  • [5] STRUCTURE OF 4-CHLOROBENZYL ALCOHOL
    HASHIMOTO, M
    NAKAMURA, Y
    HAMADA, K
    [J]. ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, 1988, 44 : 482 - 484
  • [6] LUCKEN EAC, 1969, NUCLEAR QUADRUPOLE C, pCH10
  • [7] A pulsed Cl-35 NQR study on the molecular motions and phase transition of 4-chlorobenzyl alcohol
    Niki, H
    Kano, K
    Hashimoto, M
    [J]. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES, 1996, 51 (5-6): : 731 - 735
  • [8] NIKI H, 1994, Z NATURFORSCH A, V49, P273
  • [9] SMYTH CP, 1955, DIELECTRIC BEHAVIOR, pCH2
  • [10] TERAO H, 1992, Z NATURFORSCH A, V47, P99