Why Triple Bonds Protect Acenes from Oxidation and Decomposition
作者:Werner Fudickar、Torsten Linker
DOI:10.1021/ja306056x
日期:2012.9.12
Furthermore, the products obtained from thermolysis and the kinetics of the thermolysis are investigated. Density functional theory is applied in order to predict reaction energies, frontier molecular orbital interactions, and radical stabilization energies. The combined results allow us to describe the mechanisms of the oxidations and the subsequent thermolysis. We found that the alkynyl group not only
Phenyleneanthracene derivatives as triplet energy acceptor/emitter in red light excitable triplet-triplet-annihilation upconversion
作者:Fangfang Zhong、Jianzhang Zhao
DOI:10.1016/j.dyepig.2016.09.057
日期:2017.1
anthracene derivatives with 9,10-substituents were prepared as triplet acceptors/emitters for triplet-triplet-annihilation (TTA) upconversion. Different linkages of CC single bonds and CC triple bonds were used to tune the singlet and triplet state energy levels, which may enhance the TTA upconversion. The study of the photophysical properties of the compounds indicates that the CC linker does not alter
Effects of terminal biphenyl ring geometry on the photophysical properties of <i>closo-o</i>-carboranyl–anthracene dyads
作者:Ju Hyun Hong、Sehee Im、Yung Ju Seo、Na Young Kim、Chan Hee Ryu、Mingi Kim、Kang Mun Lee
DOI:10.1039/d1tc02051j
日期:——
the terminal (bi)phenyl rings suppressed ICT transitions. The above findings reveal that the molecular rigidity of the moiety appended to aromatic rings in o-carboranyl–anthracene dyads strongly affects the efficiency of their ICT-based emission and suggest that this emission can be enhancedvia the attachment of rigid substituents to o-carboranyl luminophores.
制备了四种在 C10 上带有苯基 ( AC ) 或联苯 ( o AC , m AC和p AC ) 取代基和在 C9 上带有 closo -o -carboranyl 单元的蒽基化合物,并对其进行了充分表征,以建立增强解决方案的设计策略。 - 和closo -o- carboranyl 发光体在环境温度下的固态发射特性。在所有固态分子结构中,由于分子内位阻,蒽部分严重扭曲,这表明邻碳硼烷笼周围的结构变化受到强烈抑制。与其他o相比-carboranyl 化合物, o AC , 拥有一个邻型联苯基团, 在四氢呋喃溶液和 298 K 膜态中表现出更高的发射强度、量子效率和辐射衰减常数。 计算第一激发态的电子跃迁表明发射起源来自涉及邻碳硼烷的分子内电荷转移 (ICT) 跃迁。基于以蒽和(联)苯基之间的键轴为中心的二面角处的相对能量计算基态能垒,并暗示末端(联)苯环的旋转运动在o AC 中受到较少限制
derivatives into anthracene endoperoxides, leading to the release of guests. By employing 10-phenyl-9-(2-phenylethynyl)anthracene whose endoperoxide can be converted back by heating as the guest, a reversible controlled release system is constructed. This study not only gives a type of porphyrin-based metallacage that shows desired host–guest interactions with PAHs but also offers a photooxidation-responsive
开发具有有效主客体特性的超分子主体对其应用至关重要。在此,我们报道了一种基于卟啉的金属螯合物的制备,该金属螯合物可作为一系列多环芳烃(PAH)的主体。在乙腈/氯仿中,金属卤化物和晕苯之间的缔合常数达到2.37 × 10 7 M –1 (ν/ν = 9/1),这是基于金属卤化物的主客体配合物中的最高值之一。此外,金属包合物表现出良好的单线态氧生成能力,可进一步用于将封装的蒽衍生物氧化成蒽内过氧化物,从而释放客体。以10-苯基-9-(2-苯基乙炔基)蒽为客体,其内过氧化物可通过加热转化回来,构建了可逆的控释系统。这项研究不仅给出了一种基于卟啉的金属络合物,它显示出与多环芳烃所需的主客体相互作用,而且还提供了光氧化响应的主客体识别基序,这将指导未来金属络合物在刺激响应材料中的设计和应用。
Unsymmetrical Anthracene Platforms as Singlet Oxygen Batteries: Effects of Substituents on Photooxygenation and Endoperoxide Thermolysis
作者:Paul De Bonfils、Pierrick Nun、Vincent Coeffard
DOI:10.1002/ejoc.202400099
日期:2024.4.8
Unsymmetrical anthracene derivatives have been synthetized and demonstrated a good ability to capture, store and release singlet oxygen (1O2). Kinetic studies performed by UV-visible spectroscopy revealed the influence of the substituents on the photooxygenation and the thermal cycloreversion steps. These derivatives appeared as promising 1O2 batteries for dark photooxygenation.
不对称蒽衍生物已被合成,并表现出良好的捕获、储存和释放单线态氧( 1 O 2 )的能力。通过紫外-可见光谱进行的动力学研究揭示了取代基对光氧化和热环化步骤的影响。这些衍生物似乎是用于暗光氧化的有前途的1 O 2电池。