A mechanistic investigation of mechanochromic luminescent organoboron materials
A mechanistic investigation of mechanochromic luminescent organoboron materials
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有机硼材料力致变色发光的机理研究
DOI：
10.1039/c2jm32809g
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发表时间：
2012-07
影响因子：
--
通讯作者：
Zhang, Guoqing
中科院分区：
文献类型：
--
作者：
Sun, Xingxing;Zhang, Xuepeng;Li, Xinyang;Liu, Shiyong;Zhang, Guoqing
机械致变色发光（ML）是指固态材料由于机械扰动而引起的发光颜色和/或强度变化。对于有机分子固体，这种现象与单个荧光团的特定堆积模式和取向有关，这可能会引起不同的激发态相互作用。二氟硼二苯甲酰甲烷（BF 2dbm）衍生物的分子固体在室温下表现出可逆的ML，是有前途的自修复光学材料。在这份报告中，我们的目标是揭示一些光的机制，BF 2dbm ML试图了解固态BF 2dbm分子之间的激发态相互作用，并阐明这些相互作用如何改变机械刺激。我们首先研究了光学稀溶液中的单体，二聚体和聚合物BF 2dbm衍生物的光学性质，并明确表明，BF 2dbm部分有形成H-聚集体的倾向。接下来，我们研究了这些固态硼配合物的物理性质，包括它们的晶体结构、荧光发射和机械致变色发光。通过相关的解决方案的数据与固态表征结果，可以得出结论，两个耦合的过程，力诱导的发射H-聚集体的形成和能量转移到发射H-聚集体，是负责所观察到的BF 2dbm ML在固态。
Mechanochromic luminescence (ML) refers to the luminescence color and/or intensity change of solid-state materials induced by mechanical perturbations. For organic molecular solids, this phenomenon is related to the specific packing modes and orientations of individual fluorophores, which could give rise to different excited-state interactions. The molecular solids of difluoroboron dibenzoylmethane (BF2dbm) derivatives were previously found to exhibit reversible ML at room temperature and are promising as self-healing optical materials. In this report, we aim to shed some light on the mechanism of BF2dbm ML by trying to understand the excited-state interactions among solid-state BF2dbm molecules and elucidate how these interactions change upon mechanical stimulation. We first investigated the optical properties of monomeric, dimeric, and polymeric BF2dbm derivatives in optically dilute solutions and demonstrated unambiguously that BF2dbm moieties have a propensity to form H-aggregates. Next, we studied the physical properties of these boron complexes in the solid state including their crystal structures, fluorescence emissions, and mechanochromic luminescence. By correlating solution data with the solid-state characterization results, it was concluded that two coupled processes, force-induced emissive H-aggregate formation and energy transfer to the emissive H-aggregates, are responsible for the observed BF2dbm ML in the solid state.
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影响因子：
--
作者：
Jeong-Ik Lee;Taehyoung Zyung;Robert D. Miller;Yonghee Kim;S. Jeoung;Dongho. Kim
通讯作者：
Jeong-Ik Lee;Taehyoung Zyung;Robert D. Miller;Yonghee Kim;S. Jeoung;Dongho. Kim
影响因子：
5.7
作者：
Dou, Chuandong;Han, Liang;Wang, Yue
通讯作者：
Wang, Yue
影响因子：
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作者：
Junchen Wu;T. Yi;Tianmin Shu;Mengxiao Yu;Zhiguo Zhou;Miao Xu;Yifeng Zhou;Huijun Zhang;
通讯作者：
Junchen Wu;T. Yi;Tianmin Shu;Mengxiao Yu;Zhiguo Zhou;Miao Xu;Yifeng Zhou;Huijun Zhang;
影响因子：
4.3
作者：
Cogné-Laage, E;Allemand, JF;Jullien, L
通讯作者：
Jullien, L
影响因子：
--
作者：
Pucci, Andrea;Ruggeri, Giacomo
通讯作者：
Ruggeri, Giacomo