两种新的共聚物P1和P2,分别包含5,5-双(十二烷氧基甲基)-5,6-二氢-4 H-环戊[ c ]噻吩(DCPT)或基于DCPT的噻吩三聚体(作为供体)和4,4'合成了二丁基-2,2'-联噻唑(BTz,作为弱受体)。为了减少空间位阻并增强共轭作用,P2中的DCPT和BTz之间引入了噻吩间隔基,它们在维持侧链有序和π堆积相互作用中起着重要作用。两种聚合物均表现出π堆积的距离(约0.37 nm),但在P2中的堆积程度更大。DCPT与BTz的结合已使所得聚合物的HOMO含量降低,氧化稳定性得到了显着改善。P1和P2的p型迁移率分别为0.03和0.052 cm 2 V -1 s -1,电流开/关比(I on / I off)约为10 4和10 3, 分别。这些特性差异可能归因于供体(D)-受体(A)性质,超分子有序性,π堆积程度和薄膜微结构的变化。通过GPC,TGA,DSC,PXRD,循环伏安法
Three Au(I) acetylides have been prepared by coupling (PPh3) AuCl to the diethynyl aromatic ligands with different electronic features under mild condition. Their photophysical properties and optical power limiting (OPL) behaviors have been investigated in detail. The emission characters of the Au(I) acetylides can vary dramatically by exhibiting either singlet or triplet emission signal through changing the chemical structures of the diethynyl aromatic ligands. In addition, the OPL behaviors of the Au(I) acetylides are also affected by the diethynyl aromatic ligands to show different OPL mechanism. It has been shown that the diethynyl aromatic ligand with neither electron-rich nor electron-deficient features should benefit the OPL performance of the Au(I) acetylides in view of both OPL activity and transparency. Furthermore, the Au(I) acetylides can show comparable or even better OPL performances than the state-of-the-art C-60, indicating their great potential in the field of laser protection. All the obtained results should provide valuable information for design high performance OPL materials based on Au(I) acetylides. (C) 2016 Elsevier B.V. All rights reserved.
Coplanar Bithiazole-Centered Heterocyclic Aromatic Fluorescent Compounds Having Different Donor/Acceptor Terminal Groups
作者:Tao Tao、Yu-Xin Peng、Wei Huang、Xiao-Zeng You
DOI:10.1021/jo302706t
日期:2013.3.15
A family of stable and soluble bithiazole-centered heterocyclic aromatic fluorescent compounds is described herein. All these multiple N-donor containing compounds have effective pi-conjugated systems and different imidazole, pyridine, thiophene, triphenylamino, benzoic acid, and ethyl benzoate tails showing distinguishable D-A-A-D and A-A-A-A structures. X-ray single-crystal structures of seven compounds indicate that all of the bithiazole cores have the same trans coplanar configuration but exhibit different dihedral angles with their adjacent aromatic heterocycles (4.5(6)-69.7(3)degrees). Optical and electrochemical results demonstrate that the TPA-terminated bithiazole compound 2TPA2TZ has yellow fluorescence and reversible redox activity as well as extraordinarily high thermal stability. Theoretical and experimental studies have been made to reveal the differences from related compounds with adjustable electronic properties. The internal reorganization energy (lambda) studies have been carried out to indicate the differences between the bithiazole-based derivatives and the corresponding bithiophene-based counterparts.