Verbindungen der Formel
worin R1, R2, R3 und R. die in Anspruch 1 angegebenen Bedeutungen haben, eignen sich zum Färben von hochmolekularem organischem Material.
式中 R1、R2、R3 和 R.具有权利要求 1 所述含义的化合物适用于高分子量有机材料的着色。
Novel, soluble diphenyl-diketo-pyrrolopyrroles: Experimental and theoretical study
Derivatives of diphenyl-diketo-pyrrolopyrrole, possessing electron-donating or withdrawing groups in the p-position of the phenyl, were synthesized and studied using optical characterization (absorption, fluorescence, time-resolved fluorescence) and quantum chemical calculation. An increase in absorption coefficient >= 10(5) dm(3) mol(-1) cm(-1) was observed using electron-donor groups; a bathochromic shift in both absorption and luminescence peaks was observed as a result of increased conjugation. Soluble derivatives were obtained by the introduction of alkyl groups (by N-alkylation) in the central pyrrolopyrrole unit. Calculated phenyl torsion angles using HF and B3LYP methods showed that the loss of molecule planarity reduced the extent of overlap between the pi-orbitals of the central pyrrolopyrrole unit and phenyls after N-alkylation. This treatment thus reduced both the bathochromic shift and increased absorption coefficient. The presence of the donor or acceptor groups in itself does not influence molecule planarity. (C) 2009 Elsevier Ltd. All rights reserved.
Preparation of Solvent Soluble Dyes Derived from Diketo-pyrrolo-pyrrole Pigment by Introducing an N-Alkyl group
Unusual mechanohypsochromic luminescence and unique bidirectional thermofluorochromism of long-alkylated simple DPP dyes
作者:Shian Ying、Mingshuai Chen、Zhongwei Liu、Meng Zheng、Haichang Zhang、Shanfeng Xue、Wenjun Yang
DOI:10.1039/c7tc01453h
日期:——
5-di(tetradecyl)-3,6-bis-(p-chlorophenyl)pyrrolo[3,4-c]pyrrole (TDPP). Pristine TDPP powder is a red emitting crystal (645 nm, R state) and can be changed into a yellow amorphous state (544 nm, Y state) by mechanical grinding or solution spin-coating. The Y state could revert to the R state upon annealing below 60 °C or solvent fuming, however, annealing the Y state above 70 °C produced a new green-emitting crystalline