Crystal structures and dielectric properties of two salts of nickel-bis-1,2-dithiolene with noncentrosymmetric organic cations

Jin Yu He, Xuan Rong Chen, Yin Qian, Jian Lan Liu, Xiao Ming Ren

科研成果: 期刊稿件文章同行评审

摘要

Two nickel-bis-1,2-dithiolene salts, [1,4-dimethyl-DABCO][Ni(mnt)2] (1) and (TMSF)2[Ni(mnt)2] (2) (mnt2− = maleonitriledithiolate, 1,4-dimethyl-DABCO2+ = 1,4-dimethyl-1,4-diazoniabicyclo[2.2.2]octane and TMSF+ = trimethylsulfonium), were synthesized and characterized by elemental analysis, IR spectra, thermal analysis and single crystal structures. Both 1 and 2 crystallize in monoclinic space group C2/c, with a formula and cell parameters of C16H18N6NiS4, a = 16.9688(8) Å b = 9.3003(5) Å 13.4090(6) Å and β = 103.244(2)° for 1 at 293 K versus C14H18N4NiS6, a = 17.108(3) Å b = 10.2932(16) Å 14.071(2) Å and β = 118.845(4)° for 2 at 293 K. Moreover, two salts show similar packing structure, with the arrangements of alternating layer of anions and cations, and the layers are parallel to the crystallographic ab-plane. Both 1 and 2 display analogous dielectric behavior, which dielectric permittivity is almost a constant with ε′ ≈ 12 at the temperature below 270 K for 1 versus 215 K for 2, and two steps of dielectric relaxations appear in the higher temperature regime, which originate from the molecular dipole orientation and the ion migration.

源语言英语
页(从-至)42-49
页数8
期刊Polyhedron
155
DOI
出版状态已出版 - 15 11月 2018

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