The first dithienylpyrrole (DTP)-based bipyridine ligands has been prepared and coordinated with ruthenium to give the corresponding homoleptic complexes. Bipyridine was bound at pyrrole (DTP1) or thiophene (DTP2) ring. A strong bathochromic effect was obtained by switching from pyrrole to thiophene for ligands and complexes. Interestingly the DTP2 series offered a wide absorption window from UV to visible domain with an almost constant absorbance. These effects are due to a larger extent of delocalization as supported by DFT calculations and photophysical measurements.
第一种基于二
噻吩吡咯(DTP)的双
吡啶配体已经被合成,并与
钌配位形成相应的同构配合物。双
吡啶分别在
吡咯(DTP1)或
噻吩(DTP2)环上结合。通过将
配体和配合物从
吡咯切换到
噻吩,获得了强烈的红移效应。有趣的是,DTP2系列提供了从紫外到可见范围的宽吸收窗口,且吸光度几乎保持不变。这些效应源于更大范围的去局域化,这得到了DFT计算和光物理测量的支持。