由于π部分之间相对强的π–π相互作用,因此很难获得π共轭的室温离子液体(RTIL)。通过使用大体积抗衡离子的现有策略极大地阻碍了进一步的性能优化,以及通过简单的离子交换这些引人入胜的功能性流体的潜在应用。在此,4萘官能化的,π共轭具有小的抗衡离子(BR的RTIL - )已被轻便以高收率合成。我们的策略是将支链烷基链连接到目标化合物的阳离子主链上(2 a - d),从而有效地调节分子间和分子内的相互作用。化合物2 a – d具有令人满意的热稳定性(最高300°C)和低熔点(<−19°C)。流变学测量显示2 a – d的流体特性,其粘度随烷基链长度和温度的增加而降低。π共轭萘部分的存在在本体溶液中赋予2 a - d光致发光特性。此外,无溶剂状态的萘单元之间不存在强烈的π-π堆积,因此它们可以用作新一代的光致发光油墨。
Novel 4,8-benzobisthiazole copolymers and their field-effect transistor and photovoltaic applications
作者:Gary Conboy、Rupert G. D. Taylor、Neil J. Findlay、Alexander L. Kanibolotsky、Anto R. Inigo、Sanjay S. Ghosh、Bernd Ebenhoch、Lethy Krishnan Jagadamma、Gopala Krishna V. V. Thalluri、Muhammad T. Sajjad、Ifor D. W. Samuel、Peter J. Skabara
DOI:10.1039/c7tc03959j
日期:——
Such interactions enable a control over the degree of planarity through altering their number and strength, in turn allowing for tuning of the band gap. The resulting 4,8-BBT materials gave enhanced mobility in p-type organic field-effect transistors of up to 2.16 × 10−2 cm2 V−1 s−1 for pDPP2ThBBT and good solarcell performance of up to 4.45% powerconversionefficiency for pBT2ThBBT.
一系列含有苯并[1,2- d:4,5- d的共聚物']双(噻唑)(BBT)单元已与联噻吩基-二酮吡咯并吡咯(DPP),二噻吩并吡咯(DTP),苯并噻二唑(BT),苯并二噻吩(BDT)或4,4'-二烷氧基比噻唑(BTz)共聚单体进行设计和合成。所得的聚合物具有与通过BBT单元的2,6-位的更常见的取代途径正交的共轭途径,从而促进相邻单体单元的策略性放置的杂原子之间的分子内非共价相互作用。这种相互作用使得能够通过改变平面度的数量和强度来控制平面度,进而允许调整带隙。所得的4,8-BBT材料在p型有机场效应晶体管中的迁移率高达2.16×10 -2 cm 2 V -1š -1为pDPP2ThBBT和最多为4.45%的功率转换效率的良好的太阳能电池的性能pBT2ThBBT。
A Facile Synthesized Polymer Featuring B‐N Covalent Bond and Small Singlet‐Triplet Gap for High‐Performance Organic Solar Cells
OSC, comparable to the benzo[1,2‐b:4,5‐b′]dithiophene (BDT)‐based counterpart. The nonradiative recombination energy loss of 0.19 eV was afforded by PBNT‐BDD. PBNT‐BDD also exhibited weak crystallinity and appropriate miscibility with Y6‐BO, benefitting of morphological stability. The singlet–triplet gap (ΔEST) of PBNT‐BDD is as low as 0.15 eV, which is much lower than those of common organic semiconductors
having only alkyl groups as the sidechain and that obtained for a low-molecular weight sample reported previously. On the other hand, although PTzBTEE had a well-ordered structure similar to PTzBTE, it showed lower OPV performances. Through investigations of electronicproperties and structural order and morphology in thin films, structure-property-device performance relationships are carefully discussed
Electrochemistry and electrogenerated chemiluminescence of thiophene and fluorene oligomers. Benzoyl peroxide as a coreactant for oligomerization of thiophene dimers
作者:Alexander B. Nepomnyashchii、Robert J. Ono、Dani M. Lyons、Christopher W. Bielawski、Jonathan L. Sessler、Allen J. Bard
DOI:10.1039/c2sc20263h
日期:——
The electrochemical properties of oligomers of thiophene (with number of monomer units, n, from 2 to 12) and fluorene (n = 3 to 7) were investigated. Both sets of oligomers were characterized by the presence of two oxidation and two reduction waves as determined by cyclic voltammetry (CV), with the reversibility of the waves depending on the structural properties of the compounds. The addition or removal of a third electron was found to be difficult relative to the second, a finding shown for conjugated oligomers with chain lengths up to 7 in the case of the fluorenes and up to 12 for the thiophenes. The oligothiophenes showed a larger separation between the electrochemical waves for the same chain length, and also substantial electrogenerated chemiluminescence (ECL) signals, whose intensity increased with oligomer size. In contrast, the ECL intensity of the fluorene oligomers was essentially independent of chain length. The ECL spectra for the thiophene dodecamer were obtained with concentrations as low as 20 pM, a result that reflects a high ECL efficiency, close to that of the well-known ECL standard Ru(bpy)32+. Oligomers were also formed on electrochemical reduction of an appropriately functionalized dimer in the presence of benzoyl peroxide producing a longer wavelength emission (maximum at ∼540 nm) as opposed to the spectrum of the dimer (λem = 390 nm).
D–A conjugated polymers based on thieno[3,2-b]indole (TI) and 2,1,3-benzodiathiazole (BT) derivatives: synthesis, characterization and side-chain influence on photovoltaic properties
A facile synthetic strategy toward thieno[3,2-b]indole (TI) derivatives was developed by the Cadogan annulation method. Three donor‒acceptor (D‒A) conjugated polymers P1, P2 and P3 containing N-alkyl-TI derivatives and 4,7-dithien-5-yl-2,1,3-benzodiathiazole (DTBT)...