کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7806813 | 1501645 | 2018 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural, vibrational and electrical studies of tetramethylammonium trichloromercurate [(CH3)4N]HgCl3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The crystal structure of [(CH3)4N]HgCl3 is redetermined at 298â¯K in monoclinic system [P21(Zâ¯=â¯4); aâ¯=â¯7.5501(3) Ã
, bâ¯=â¯15.6871(6) Ã
, câ¯=â¯8.8666(4) Ã
, βâ¯=â¯93.575(2)°]. The anionic sublattice of the crystal is consisted of (HgCl3â)n polyhedra sharing a vertex to form zigzag chains along the a-axis. The crystal structure cohesion is ensured by C-Hâ¯Cl hydrogen bonds that connect organic (CH3)4N+ and mineral parts. Infrared (450-4000â¯cmâ1) and Raman (50-3500â¯cmâ1) spectra, studied at room temperature, confirm the connection of organic cations (CH3)4N+ and (HgCl3â)n polymers by CHâ¯Cl hydrogen bonding. One phase transition is observed and studied for this compound by DSC (269°/260â¯Â°C) and dielectric measurements (254â¯Â°C). The dielectric constant evolution with temperature indicates that the observed transition is of ferro-paraelectric type. Cole-Cole plots of impedance complex have been performed. The activation energy (0.85 ev) obtained from dc conductivity analysis indicates a probable hoping mechanism of the transport in the title compound.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1173, 5 December 2018, Pages 865-875
Journal: Journal of Molecular Structure - Volume 1173, 5 December 2018, Pages 865-875
نویسندگان
F. Lambarki, A. Ouasri, A. Rhandour, M. Saadi, L. El Ammari, L. Hajji,