Design and synthesis of 4,4′-π-conjugated[2,2′]-bipyridines: a versatile class of tunable chromophores and fluorophores
作者:Maury、Guegana、Renouard、Hilton、Dupau、Sandon、Toupet、Le Bozec
DOI:10.1039/b106096c
日期:2001.12.3
A series of 4,4â²-disubstituted[2,2â²]-bipyridines, featuring Ï-conjugated substituents such as donor-(acceptor-) substituted styryl, thienylvinyl, phenylimino and phenylazo groups, have been synthesized. X-Ray structures are provided for three ligands containing âCCâ, âCNâ and âNNâ linkers, respectively. These chromophores display good to excellent thermal stabilities with decomposition temperatures of up to 350â°C. The strong influence of the nature of the endgroups and Ï-linkers on the optical properties is discussed. The stepwise protonation of 4,4â²-dibutylaminostyryl-[2,2â²]-bipyridine and its coordination behavior to different metallic moieties [Zn(II), Hg(II), Pd(II), Re(I), Re(VII)]
have also been investigated. It is found that the absorption and emission maxima can be easily tuned by these exogenous additives over a wide range of wavelengths (360â<âλabsâ<â560 nm ; 482â<âλemâ<â646 nm).
合成了一系列4,4'-二取代的[2,2'-]联吡啶,其中的π-共轭取代基包括供体(受体)取代的苯乙烯基、噻吩乙烯基、苯亚胺基和苯偶氮基团。提供了三个含有-CC-、-CN-和-NN-连接子的配体的X射线结构。这些发色团显示了良好的至优良的热稳定性,分解温度高达350°C。讨论了末端基团和π-连接子性质对光学特性的强烈影响。还研究了4,4'-二丁氨基苯乙烯基-[2,2'-]联吡啶的分级质子化和其与不同金属部分[Zn(II)、Hg(II)、Pd(II)、Re(I)、Re(VII)]的配位行为。发现这些外源添加剂可以轻易地在广泛的波长范围内调节吸收和发射最大值(360 < λabs < 560 nm ; 482 < λem < 646 nm)。