Synthesis, Characterization, and Optical Properties of 4H-Pyran-4-ylidene Donor-Based Chromophores: The Relevance of the Location of a Thiophene Ring in the Spacer
摘要:
A series of new 4H-pyran-4-ylidene donor-based chromophores with a thiophene ring in the spacer has been synthesized. The linear and nonlinear optical (NLO) properties of these compounds have been determined and compared with the results of computational calculations. The position of the thiophene ring proved essential to optimize the figure of merit mu beta, with the best results obtained when the heterocyclic system was closer to the donor moiety.
4H‐Pyranylidene‐containing push‐pull chromophores built around a bithiophene (BT) πrelay or a rigidified thiophene‐based unit, namely cyclopenta[1,2‐b:3,4‐b′]dithiophene (CPDT) or dithieno[3,2‐b:2′,3′‐d]pyrrole (DTP), have been synthesized and characterized. The effect of these different relays on the polarization and the second‐order nonlinearoptical (NLO) properties has been studied. For the sake of
4 ħ -Pyranylidene含围绕双噻吩(BT)π继电器或僵化基于噻吩的单元,即环戊二烯并内置推挽生色团[1,2 b:3,4- b ']二噻吩(CPDT)或二噻吩并[已合成并表征了3,2‐ b:2',3'‐ d ]吡咯(DTP)。研究了这些不同继电器对偏振和二阶非线性光学(NLO)特性的影响。为了比较,报告了相应的dithieno [3,2‐ b:2′,3′‐ d噻吩(DTT)衍生物也已包括在讨论中。用加固单元(CPDT,DTP)替换BT核心会导致极化更多的系统。计算得出的NBO电荷和电化学测量结果表明,二噻吩并吡咯具有显着的施主特性,可以在施主和受主之间进行重要的电荷转移。BT中继的刚性对NLO响应的影响取决于受体强度。对于所使用的最薄弱的受体(硫代巴比妥酸),从BT中继到僵化单元传递总是涉及在增加μβ 0品质因数。然而,对于最强受体(2-二氰基亚甲基-3-氰基-1,4,5,5-三甲基-2
Pyranylidene/trifluoromethylbenzoic acid-based chromophores for dye-sensitized solar cells
enhancement of the molar extinction coefficient, being slightly when a hexyl chain is introduced in the thiophene ring, but does not modify the oxidation potential. For the preparation of derived solarcells an antiaggregant is essential in all cases. The photovoltaic performance is sensitive to the structural modification of the dye: the CF3 group and the hexyl chain of the thiophene spacer were shown
Organic sensitizers bearing a trialkylsilyl ether group for liquid dye sensitized solar cells
作者:Raquel Pérez-Tejada、Natalia Martínez de Baroja、Santiago Franco、Laia Pellejà、Jesús Orduna、Raquel Andreu、Javier Garín
DOI:10.1016/j.dyepig.2015.07.026
日期:2015.12
In this work we present the synthesis, optical characterization and performance of five metal-free sensitizers for dye-sensitized solar cells (DSSC). All dyes include, for the first time, a trialkylsilyl ether group in the pi-conjugated bridge (a thiophene ring). The influence of different donor unities, like triarylamine (TPA), 4H-pyranylidene and dithiafulvene has been evaluated in DSSC with a liquid I-3/I- electrolyte, obtaining the best results with the 4H-pyranylidene moiety. The size and the position of the bulky group have a great importance in the efficiency of the final devices.In order to explain the recombination processes and electron life-time, charge extraction (CE) and transient photovoltage (TPV) experiments have been carried out. (C) 2015 Elsevier Ltd. All rights reserved.
Influence of thiazole regioisomerism on second-order nonlinear optical chromophores
作者:Elena Galán、Raquel Andreu、Javier Garín、Laura Mosteo、Jesús Orduna、Belén Villacampa、Beatriz E. Diosdado
DOI:10.1016/j.tet.2012.05.123
日期:2012.8
Two series of matched and mismatched donor-thiazole-acceptor chromophores have been synthesized to disclose the role that the orientation of the thiazole ring plays on their second-order nonlinear optical (NLO) properties. Whereas previous theoretical studies predict that the matched systems show markedly higher NLO responses, our experimental results do not parallel this trend, showing differences between regioisomers much lower than those predicted. (C) 2012 Elsevier Ltd. All rights reserved.
Efficient second-order nonlinear optical chromophores based on dithienothiophene and thienothiophene bridges
Two series of push-pull systems bearing dithienothiophene or thienothiophene as (part of) pi-conjugated spacer have been synthesized. These compounds combine high second-order molecular non-linearities with good thermal stabilities, showing one of the thienothiophene (TT) derivative the highest mu beta(0) value found for a 4H-pyranylidene-containing merocyanine. (C) 2013 Elsevier Ltd. All rights reserved.