Copper ion salts of arylthiotetrathiafulvalenes: synthesis, structure diversity and magnetic properties.

Copper ion salts of arylthiotetrathiafulvalenes: synthesis, structure diversity and magnetic properties.
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DOI:
10.3762/bjoc.11.95
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发表时间:
2015
影响因子:
2.7
通讯作者:
Shao X
Shao X
中科院分区:
化学4区
文献类型:
--
作者:
Ma L;Sun J;Lu X;Zhang S;Qi H;Liu L;Shao Y;Shao X

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溴化亚铜和芳硫基取代的四硫富瓦烯衍生物(1-7)的组合产生一系列电荷转移(CT)络合物。晶体学研究表明,配合物中的阴离子由CuBr_2衍生而来,具有不同的构型,包括线型[Cu(I)Br_2]-、四面体[Cu(II)Br_4]2-、平面[Cu(II)2Br_6]2-以及平面[Cu(II)Br_4]2-和四面体[Cu(II)Br_3]-离子共存。另一方面,TTFs显示自由基阳离子或双阳离子状态,这取决于它们的氧化还原电位。大多数TTF上的中心TTF骨架几乎是平面的,尽管它们上带有电荷,而在配合物4·CuBr 4中,分子4上的两个二硫杂环戊烯环以38.3°的二面角显著扭曲。并对配合物的磁性进行了表征。配合物5·Cu 2Br 6的磁化率随温度的变化表现为单重态-三重态跃迁,耦合常数J = −248 K; 3·(CuBr 4)0.5·CuBr 3·THF的磁化率随温度的变化表现为270 K处的突变,这是由于分子间相互作用的调制。其他配合物的磁化率随温度的变化符合居里-外斯定律,表明低温下存在弱的反铁磁相互作用。
The combination of CuBr2 and arylthio-substituted tetrathiafulvalene derivatives (1–7) results in a series of charge-transfer (CT) complexes. Crystallographic studies indicate that the anions in the complexes, which are derived from CuBr2, show diverse configurations including linear [Cu(I)Br2]–, tetrahedral [Cu(II)Br4]2–, planar [Cu(II)2Br6]2–, and coexistence of planar [Cu(II)Br4]2– and tetrahedral [Cu(II)Br3]– ions. On the other hand, the TTFs show either radical cation or dication states that depend on their redox potentials. The central TTF framework on most of TTFs is nearly planar despite the charge on them, whereas the two dithiole rings on molecule 4 in complex 4·CuBr4 are significantly twisted with a dihedral angle of 38.3°. The magnetic properties of the complexes were elucidated. The temperature-dependent magnetic susceptibility of complex 5·Cu2Br6 shows the singlet–triplet transition with coupling constant J = −248 K, and that of 3·(CuBr4)0.5·CuBr3·THF shows the abrupt change at 270 K caused by the modulation of intermolecular interactions. The thermo variation of magnetic susceptibility for the other complexes follows the Curie–Weiss law, indicating the weak antiferromagnetic interaction at low temperature.
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