Synthesis of dihydroindolizines for potential photoinduced work function alteration
摘要:
Seeking to immobilize photochromophores on metallic surfaces, we have synthesized four molecules which contain both a photoresponsive dihydroindolizine (DHI) core and a sulfur containing moiety, which allow for their assembly onto gold substrates. Sonogashira, Suzuki, or Ullmann couplings are employed to generate pyridines with pendant thioacetates (or disulfides). The pyridines are condensed with spiro[2-cyclopropene-1,9'[9H]fluorene]-2,3-dimethyl ester affording the targeted DHIs. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of palladium and platinum donor complexes and study of their participation in self-assembly reactions. X-ray crystal structure of [Pt(C6H4CCC5H4N)2(dppp)] (dppp=1,3-bis(diphenylphosphino)propane)
square-planar compounds [M(NC5H4CCH)2(dppp)](OTf)2 (M = Pd (1), Pt (2)), [Pt(CCC6H4CN)2(dppp)] (3) and [Pt(C6H4CCC5H4N)2(dppp)] (4) (dppp = 1,3-bis(diphenylphosphino)propane) were prepared and characterised. Their potential as buildingblocks in the generation of heterobimetallic squares was studied. The reaction of 4 and the ditopic acceptor species [Pd(H2O)2(dppf)](OTf)2 enabled a tetrametallic metallocycle
新型方形化合物[M(NC 5 H 4 CCH)2(dppp)](OTf)2(M = Pd(1),Pt(2)),[Pt(CCC 6 H 4 CN)2(dppp) ](3)和[PT(C 6 H ^ 4 CCC 5 ħ 4 N)2(DPPP)](4)(DPPP = 1,3-双(二苯基膦基)丙烷)的制备和表征。研究了它们作为生成异双金属正方形的基础的潜力。的反应4和双中心受体物种[钯(H 2 O)2(dppf)](OTf)2使得能够获得包含两个铂和两个钯原子的四金属金属环。的单晶X射线结构4示出了铂⋯N个矢量大致垂直,并确认化合物是否适合作为用于分子正方形的结构的角部。
Intramolecular Energy Transfer within Butadiyne-Linked Chlorophyll and Porphyrin Dimer-Faced, Self-Assembled Prisms
作者:Richard F. Kelley、Suk Joong Lee、Thea M. Wilson、Yasuyuki Nakamura、David M. Tiede、Atsuhiro Osuka、Joseph T. Hupp、Michael R. Wasielewski
DOI:10.1021/ja075494f
日期:2008.4.1
scattering experiments in solution using a synchrotron source. Photoexcitation of the prismatic assemblies reveals that efficient, through-space energytransfer occurs between the macrocyclic dimers within the prisms. The distance dependence of energytransfer between the faces of the prisms was observed by varying the size of the prismatic assemblies through the use of 3-fold symmetric ligands having
描述了丁二炔连接的叶绿素和卟啉二聚体在甲苯溶液和几种自组装棱柱结构中的合成和光物理特性。大环 20 位之间的丁二炔键导致新的电子跃迁沿二聚体的长轴极化。这些跃迁极大地提高了这些二聚体在宽波长范围内吸收太阳光谱的能力。飞秒瞬态吸收光谱揭示了大环围绕连接它们的丁二炔键的相对旋转速率。添加 3 重对称的金属配位配体后,两种大环二聚体自组装成棱柱结构,其中二聚体构成棱柱面。这些结构通过使用同步加速器源在溶液中的小角度 X 射线散射实验得到证实。棱镜组件的光激发表明棱镜内的大环二聚体之间发生了有效的空间能量转移。通过使用具有不同长度臂的 3 重对称配体来改变棱柱组件的尺寸,观察棱柱面之间能量转移的距离依赖性。这些结果表明,离散大环棱镜的自组装为控制用于人工光合作用和太阳能电池应用的天线系统中的单线态激子流提供了一种有用的新策略。跨空间能量转移发生在棱镜内的大环二聚体之间。通过使用具有不同长度臂的 3
Linear ditopic acetylide gold or mercury complexes: synthesis and photophysic studies
作者:Montserrat Ferrer、Laura Rodrı́guez、Oriol Rossell、Fernando Pina、João C Lima、Mercè Font Bardia、Xavier Solans
DOI:10.1016/s0022-328x(03)00442-x
日期:2003.7
the lower triplet state. Decay times were measured at room temperature in CH2Cl2 for 1aH (1.5 μs) and in ethanol at 77 K (149 and 500 μs for compounds 1aH and 1a′, respectively). Room-temperature emission of compounds 3a and 3aH arises from the lower singlet state and phosphorescence is only observed at 77 K. Theoretical calculations on the nature and energy of singlet and tripletstates corroborate
Mechanistic Aspects of Aryl–Halide Oxidative Addition, Coordination Chemistry, and Ring‐Walking by Palladium
作者:Olena V. Zenkina、Ori Gidron、Linda J. W. Shimon、Mark A. Iron、Milko E. van der Boom
DOI:10.1002/chem.201501580
日期:2015.11.2
that the reaction with palladium may proceed through a dissociation–oxidative addition mechanism rather than through a haptotropic intramolecular process (i.e., ring walking). Furthermore, the transition state involves coordination of a third phosphine to the palladium center, which is lost during the oxidative addition as the Chalide bond is being broken. Interestingly, selective activation of aryl
2-Phenyl-1,3-di(4-pyridyl)naphthvalene 3a was synthesized by the photoinduced reversible valence isomerization of 2-phenyl-1,3-di(4-pyridyl)naphthalene 2a. Then, 3a was converted into 3-phenyl-1,2-di(4-pyridyl)naphthalene 4a and 2a simultaneously. The t1/2 of 3a in DMSO-d6 at 90 °C was 2 h, while that at 110 °C was approximately 10 min.
2-苯基-1,3-二(4-吡啶基)naphthvalene 3A通过2-苯基-1,3-二(4-吡啶基)萘的光致可逆价异构合成2a中。然后,将3a同时转化为3-苯基-1,2-二(4-吡啶基)萘4a和2a。在90°C下DMSO- d 6中3a的t 1/2为2 h,而在110°C下约为10分钟。