二噻吩乙烯Th_2im与化合物(Th_2imH)_2[ReCl_6]:晶态光致变色反应及其对发光和磁性质的光化学调控
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- 英文论文题名：Bisthienylethene Th_2im and its complex(Th_2imH)_2[ReCl_6]:crystalline-phase photochromism,and photochemical regulation of luminescent and magnetic properties
- 论文作者：龚丹萍 ; 陈俊锋 ; 赵越 ; 曹登科
- 英文论文作者：Dan-Ping Gong ; Jun-Feng Chen ; Yue Zhao ; Deng-Ke Cao ; School of Chemistry and Chemical Engineering ; Nanjing University
- 年：2016
- 作者机构：南京大学化学化工学院;
- 论文关键词：晶态光致变色 ; 发光行为 ; 磁性质
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十六分会：晶体工程
- 语种：中文
- 分类号：O641.4
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十六分会 ; 晶体工程
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：445k
- 原文格式：D
- 会议级别：全国
摘要
二噻吩乙烯Th_2im(1)与[ReCl_6]~(2-)的分子组装形成化合物(Th_2imH)_2[ReCl_6](2)。在2中,[ReCl_6]~(2-)与两个等价的Th_2imH~+阳离子通过Cl…N/C氢键相连。1和2的晶体结构表明,每个Th_2im/Th_2imH~+分子中的两个噻吩基团均采取光学活性的反平行构象。因此,这两个化合物表现出晶态光致变色行为,即在紫外光(365 nm)和可见光(574 nm for 1,624 nm for2)的交替照射下,化合物发生可逆的开环与闭环结构之间的转换。研究发现化合物1和2的晶态光致变色性质可以调控它们的发光和(或)磁性行为。在紫外光(365 nm)的照射下,它们的固态发射(433,448,482,531 and 570 nm for 1,and 460,489,535 and 593 nm for 2)表现出减弱的发光强度。除了晶态光致变色和发光性质以外,化合物2还表现出外磁场诱导的慢磁性弛豫行为。在紫外光照射前后,该化合物表现出不同的X_MT-T曲线,D参数,有效磁矩U_(eff)和指前因子τ_0
Molecular assembly of bisthienylethene Th_2im(1) and[ReCl_6]~(2-) anion leads to complex(Th_2imH)_2[ReCl_6](2),in which a[ReCl_6]~(2-) anion connects two equivalent Th_2imH~+ cations through C1…N/C hydrogenbonds.Crystal structures of 1 and 2 indicate that two thiophene groups of each Th_2im/Th_2imH~+ molecule adopt photoactive antiparallel conformation.Thus,two compounds show crystalline-phase photochromism(CPP).It was found that the CPP behaviors of1 and 2 could regulate their luminescent and/or magnetic properties.Their solid-state emissions(433,448,482,531 and 570 nm for 1,and 460,489,535 and 593 nm for 2) exhibited weaker intensities after UV irradiation with 365 nm light.Except CPP and luminescence,compound 2shows field-induced slow magnetic relaxation.Before and after UV irradiation,this compound revealed different magnetic behaviors,including the differences in the shape of the χ_M T vs.T plot,D parameter,and the values of relaxation barrier U_(eff) and preexponential factor τ_0.
Molecular assembly of bisthienylethene Th_2im(1) and[ReCl_6]~(2-) anion leads to complex(Th_2imH)_2[ReCl_6](2),in which a[ReCl_6]~(2-) anion connects two equivalent Th_2imH~+ cations through C1…N/C hydrogenbonds.Crystal structures of 1 and 2 indicate that two thiophene groups of each Th_2im/Th_2imH~+ molecule adopt photoactive antiparallel conformation.Thus,two compounds show crystalline-phase photochromism(CPP).It was found that the CPP behaviors of1 and 2 could regulate their luminescent and/or magnetic properties.Their solid-state emissions(433,448,482,531 and 570 nm for 1,and 460,489,535 and 593 nm for 2) exhibited weaker intensities after UV irradiation with 365 nm light.Except CPP and luminescence,compound 2shows field-induced slow magnetic relaxation.Before and after UV irradiation,this compound revealed different magnetic behaviors,including the differences in the shape of the χ_M T vs.T plot,D parameter,and the values of relaxation barrier U_(eff) and preexponential factor τ_0.
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