Syntheses and properties of core-substituted naphthalene bisimides with aryl ethynyl or cyano groups
作者:Stéphanie Chopin、Frédérique Chaignon、Errol Blart、Fabrice Odobel
DOI:10.1039/b704489e
日期:——
This paper reports the synthesis, the absorption and the emission spectra and the electrochemical and spectroelectrochemical properties of new naphthalene bisimides substituted in positions 2 and 6 of the napthyl core by cyano, pyrrolidino, 4-phenylethynyl, 4-ethynyl-N,N-dihexylaniline or 4-cyanophenyl groups. The synthesis of these five new compounds shares the common precursor: 2,6-dibromonaphthalene tetracarboxylic dianhydride. We show that the aryl ethynyl substituent red-shifts the absorbance and enhances the fluorescence quantum yield of the naphthalene bisimide, making these new compounds potential useful dyes. The cyano groups directly connected to the naphthyl core significantly decrease the two first reduction potentials of the molecule. The large electron affinity and the stability of the radical anion of the latter compound make it ideally suited to transport electrons or to act as an electron acceptor.
本文报告了在萘核的第 2 和第 6 位被氰基、吡咯烷基、4-苯乙炔基、4-乙炔基-N,N-二己基苯胺或 4-氰基苯基取代的新萘双亚胺的合成、吸收和发射光谱以及电化学和光谱电化学特性。这五种新化合物的合成有一个共同的前体:2,6-二溴萘四羧酸二酐。我们的研究表明,芳基乙炔基取代基能使萘二亚胺的吸光度发生红移并提高荧光量子产率,从而使这些新化合物成为潜在的有用染料。与萘核直接相连的氰基大大降低了分子的两个第一还原电位。后一种化合物的自由基阴离子具有较大的电子亲和力和稳定性,因此非常适合传输电子或作为电子受体。