光可切换化合物可以通过光在两种异构体之间可逆地切换,继续引起广泛应用的显着关注。偶氮杂芳烃代表了一种相对较新但研究不足的光开关类型,其中传统偶氮苯类中的一个芳环已被五元杂芳环取代。初步研究表明,偶氮杂芳烃——特别是芳基并吡唑——具有优异的光开关特性(定量开关和长 Z 异构体半衰期)。在这里,我们提出了一项系统的计算和实验研究,以阐明芳基并吡唑的长热半衰期和优异的可寻址性的起源,并应用这一理解来确定各种可比较的偶氮杂芳基光开关的重要结构-性质关系。我们通过杂环的调节,鉴定了具有 Z 异构体半衰期从几秒到几小时、到几天甚至几年以及可变吸收特性的化合物。构象可能在决定这些性质方面发挥着最大的作用:异构化半衰期最长的化合物采用 T 形基态 Z 异构体构象并通过 T 形异构化途径进行,而对于具有最长异构化半衰期的化合物,实现了最完整的光开关具有扭曲(而不是 T 形)的 Z 异构体构象。通过平衡这些因素,我们报告了一种新的偶氮吡唑
Tuning Azoheteroarene Photoswitch Performance through Heteroaryl Design
作者:Joaquín Calbo、Claire E. Weston、Andrew J. P. White、Henry S. Rzepa、Julia Contreras-García、Matthew J. Fuchter
DOI:10.1021/jacs.6b11626
日期:2017.1.25
switching and long Z isomer half-life). Here we present a systematic computational and experimental study to elucidate the origin of the long thermal half-lives and excellent addressability of the arylazopyrazoles, and apply this understanding to determine important structure-property relationships for a wide array of comparable azoheteroaryl photoswitches. We identify compounds with Z isomer half-lives ranging
光可切换化合物可以通过光在两种异构体之间可逆地切换,继续引起广泛应用的显着关注。偶氮杂芳烃代表了一种相对较新但研究不足的光开关类型,其中传统偶氮苯类中的一个芳环已被五元杂芳环取代。初步研究表明,偶氮杂芳烃——特别是芳基并吡唑——具有优异的光开关特性(定量开关和长 Z 异构体半衰期)。在这里,我们提出了一项系统的计算和实验研究,以阐明芳基并吡唑的长热半衰期和优异的可寻址性的起源,并应用这一理解来确定各种可比较的偶氮杂芳基光开关的重要结构-性质关系。我们通过杂环的调节,鉴定了具有 Z 异构体半衰期从几秒到几小时、到几天甚至几年以及可变吸收特性的化合物。构象可能在决定这些性质方面发挥着最大的作用:异构化半衰期最长的化合物采用 T 形基态 Z 异构体构象并通过 T 形异构化途径进行,而对于具有最长异构化半衰期的化合物,实现了最完整的光开关具有扭曲(而不是 T 形)的 Z 异构体构象。通过平衡这些因素,我们报告了一种新的偶氮吡唑
Cadmium(II) Complexes of (Arylazo)imidazoles: Synthesis, Structure, Photochromism, and Density Functional Theory Calculation
作者:K. K. Sarker、D. Sardar、K. Suwa、J. Otsuki、C. Sinha
DOI:10.1021/ic7012073
日期:2007.10.1
azoimidazole. The reverse transformation, cis-to-trans, is very slow with visible light irradiation. Quantum yields (phit-->c) of trans-to-cis isomerization are calculated, and the free ligand shows higher phi values than their cadmium(II) iodo complexes. The cis-to-trans isomerization is a thermally induced process. The activation energy (Ea) of cis-to-trans isomerization is calculated by a controlled-temperature
Structure, electrochemistry and photochromism of [Cu(RaaiR′)(PPh3)X] (RaaiR′=1-alkyl-2-(arylazo)imidazole; X=Cl, Br, I) and correlation with theoretical calculations
The reaction between CuX (X = Cl, Br, I), PPh3 and 1-alkyl-2-(arylazo)imidazole (RaaiR') has synthesized [Cu(RaaiR')(PPh3)X]. The composition has been established by spectroscopic (UV-Vis, IR, H-1 NMR) data and the single crystal X-ray diffraction study of [Cu(MeaaiH)(PPh3)Cl] and [Cu(MeaaiH)(PPh3)Br] (MeaaiH = 2-(p-tolylazo)imidazole) have confirmed the structures. These complexes show trans-to-cis (E-to-Z) photoisomerisation upon UV light irradiation. Quantum yields (phi(E -> Z)) of [Cu(RaaiR')(PPh3)X] are lower than the free ligand values. The rate of isomerisation follows the sequence [Cu(RaaiR')(PPh3)Cl] < [Cu(RaaiR')(PPh3)Br] < [Cu(RaaiR')(PPh3)I]. The cis-to-trans (Z-to-E) isomerisation is very slow upon light irradiation and has been achieved by a thermal route. The activation energy (E-a) of the Z-to-E isomerisation has been calculated by a controlled temperature reaction. OFT calculations of the optimized geometry of representative complexes have been used to determine the composition and energy of the molecular levels. (C) 2012 Elsevier Ltd. All rights reserved.
Chowdhury, Bharati; Naskar, Kaushik; Mallick, Debashis, Journal of the Indian Chemical Society, 2018, vol. 95, # 4, p. 405 - 416
作者:Chowdhury, Bharati、Naskar, Kaushik、Mallick, Debashis、Sen, Chandana、Sarkar, Kamal Krishna、Sinha, Chittaranjan
DOI:——
日期:——
Misra, Tarun Kumar; Sinha, Chittaranjan, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1999, vol. 38, # 4, p. 346 - 349