Understanding the Role of Parallel Pathways via In‐Situ Switching of Quantum Interference in Molecular Tunneling Junctions
作者:Saurabh Soni、Gang Ye、Jueting Zheng、Yanxi Zhang、Andika Asyuda、Michael Zharnikov、Wenjing Hong、Ryan C. Chiechi
DOI:10.1002/anie.202005047
日期:2020.8.17
This study describes the modulation of tunneling probabilities in molecularjunctions by switching one of two parallel intramolecular pathways. A linearly conjugated molecular wire provides a rigid framework that allows a second, cross‐conjugated pathway to be effectively switched on and off by protonation, affecting the total conductance of the junction. This approach works because a traversing electron
can be stabilized when those are secured with two Cucurbit[8]uril macrocycles (CB[8]) on top of rigid 2,6- and 2,7-substituted naphthalenes, which respectively mimic the trans and cis conformations of the dithiophene. The substituents are Pt(II) terpyridyl groups bearing CB[8]-binding sites at their 4′-position, as those form dimers in the presence of the macrocycle through Pt–Pt and dispersive interactions
Synthesis and characterisation of new acetylide-functionalised oligothiophenes and their dinuclear platinum complexes
作者:Jack Lewis、Nicholas J. Long、Paul R. Raithby、Gregory P. Shields、Wai-Yeung Wong、Muhammad Younus
DOI:10.1039/a704708h
日期:——
5-bis(trimethylsilylethynyl)thiophene Ia, 2,5-diethynylthiophene Ib, 5,5′-bis(trimethylsilylethynyl)-2,2′-bithiophene IIa, 5,5′-diethynyl-2,2′-bithiophene IIb, 5,5″-bis(trimethylsilylethynyl)-2,2′∶5′,2″-terthiophene IIIa and 5,5″-diethynyl-2,2′∶5′,2″-terthiophene IIIb, has been prepared. Treatment of the complex trans-[PtPh(Cl)(PR3)2] (R = Et or Bun) with half an equivalent of the diterminal alkynyl
通过骨架中的低聚噻吩键合单元扩展π共轭的一系列硬杆炔烃,2,5-双(三甲基甲硅烷基乙炔基)噻吩Ia,2,5-二乙炔基噻吩Ib,5,5'-双(三甲基甲硅烷基乙炔基)-2,2 '-联噻吩IIa,5,5'-二乙炔基-2,2'-联噻吩IIb,5,5''-双(三甲基甲硅烷基乙炔基)-2,2'∶5',2''-对噻吩IIIa和5,5''-二乙炔基制备了-2,2'∶5',2″-三噻吩IIIb。用半当量的CH 2 Cl 2 -NHPr i 2中的二末端炔基低聚噻吩发色团Ib-IIIb处理复杂的反式-[PtPh(Cl)(PR 3)2 ](R = Et或Bu n)。在室温下,CuI的存在提供了铂二聚体反式-[(Et 3 P)2 PhPt– C CR'C C–PtPh(PEt 3)2 ](R'=噻吩二基1a,联噻吩二基2或叔噻吩二基3)和反式[[(Bu n 3 P)2 PhPt– C CR'C C–PtPh(PBu
Experimental and Theoretical Studies of Charge Delocalization in Biruthenium-Alkynyl Complexes Bridged by Thiophenes
作者:Ya-Ping Ou、Jianlong Xia、Jing Zhang、Meng Xu、Jun Yin、Guang-Ao Yu、Sheng Hua Liu
DOI:10.1002/asia.201300419
日期:2013.9
The UV/Vis/NIR spectra and TDDFT calculations of the monocations indicated that the NIR transitions displayed aromatic bridging character. EPR studies of the mono‐oxidized radical species further demonstrated that the unpaired electron/hole was delocalized over both metals and the bridging ligand and established significant participation in the ligand oxidation.
已合成了一系列由噻吩基团(噻吩,联噻吩和叔噻吩)桥接的双核钌-炔基配合物。所有这些络合物均已通过NMR光谱,X射线衍射和元素分析得到了很好的表征。这些配合物的电子性质已通过循环伏安法,UV / Vis / NIR和IR光谱,电子顺磁共振(EPR)光谱和密度泛函理论(DFT)计算进行了检查。电化学结果表明,电位差(ΔE)和比例常数(K c)随噻吩桥联单元尺寸的增加而减小。单阳离子的UV / Vis / NIR光谱和TDDFT计算表明,NIR跃迁显示出芳族桥联特征。对单氧化自由基物种的EPR研究进一步表明,未配对的电子/空穴在金属和桥联配体上都离域化,并显着参与了配体氧化。
Phenylene Vinylene Platinum(II) Acetylides with Prodigious Two-Photon Absorption
作者:Galyna G. Dubinina、Randi S. Price、Khalil A. Abboud、Geoffrey Wicks、Pawel Wnuk、Yuriy Stepanenko、Mikhail Drobizhev、Aleksander Rebane、Kirk S. Schanze
DOI:10.1021/ja309393c
日期:2012.11.28
The linear and nonlinearopticalproperties of a series of linear and cross-conjugated platinum(II) acetylide complexes that contain extended p-(phenylene vinylene) chromophores are reported. The complexes exhibit very high femtosecond two-photon absorption (2PA) cross section values (σ(2) up to 10,000 GM), as measured by nonlinear transmission (NLT) and two-photon excited fluorescence (2PEF) methods