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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Isomeric thiophene-fused benzocarborane molecules-different lithium doping effect on the nonlinear optical property
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Isomeric thiophene-fused benzocarborane molecules-different lithium doping effect on the nonlinear optical property

机译:异构噻吩稠合的苯并碳烷分子-不同的锂掺杂对非线性光学性质的影响

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Recently, two isomeric thiophene-fused benzocarborane derivatives Tb1 and Tb2 with different locations of sulfur atoms, labeled as 1, 4 and 6, 9 of the thiophene were synthesized by Morisaki (Chem.-Eur. J., 2012, 18, 11251-11257) and Barrere (Macromolecules, 2009, 42, 2981-2987), respectively. In the present work, natural bond orbital (NBO) analysis shows that after doping one lithium atom into the isomeric structures Tb1 and Tb2, the electrons transfer to different regions in Tb1 and Tb2. For Tb1-Li, the transferred electrons mainly locate at S1, C2, C3, and S4, but for Tb2-Li, the transferred electrons mainly locate at C2, C3, C7, and C8. Significantly, the charge distribution is a crucial factor influencing the static first hyperpolarizabilities for Tb1-Li and Tb2-Li. Furthermore, the β_(tot) value of Tb1-Li is 6222 au, which is about 160 times larger than that of Tb1 (39 au). However, the β_(tot)value of Tb2-Li (498 au) is only about 5 times larger than that of the corresponding Tb2 (91 au). It is our expectation that this work could provide useful information for the development of nonlinear optical materials based on carboranes.
机译:最近,Morisaki合成了两种具有不同硫原子位置,标记为噻吩的1,4和6、9的噻吩稠合的苯并甲碳氢化合物异构体Tb1和Tb2(Morisaki(Chem.-Eur.J.,2012,18,11251- 11257)和Barrere(Macromolecules,2009,42,2981-2987)。在目前的工作中,自然键轨道(NBO)分析表明,将一个锂原子掺杂到异构体Tb1和Tb2中后,电子转移到Tb1和Tb2中的不同区域。对于Tb1-Li,转移的电子主要位于S1,C2,C3和S4,但是对于Tb2-Li,转移的电子主要位于C2,C3,C7和C8。显然,电荷分布是影响Tb1-Li和Tb2-Li的静态第一超极化率的关键因素。此外,Tb1-Li的β_(tot)值为6222 au,是Tb1(39 au)的约160倍。但是,Tb2-Li(498 au)的β_(tot)值仅是相应Tb2(91 au)的β_(tot)值的大约5倍。我们希望这项工作可以为开发基于碳硼烷的非线性光学材料提供有用的信息。

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