New ruthenium(II) heteroleptic complexes containing the 4-(2-pyridyl)pyrimidine ligand with amine and amino acid substituents
作者:Hassan Aït-Haddou、Elena Bejan、Jean-Claude Daran、Gilbert G. A. Balavoine、Florence Berruyer-Penaud、Lydia Bonazzola、Henda Smaoui-Chaabouni、Edmond Amouyal
DOI:10.1039/a904617h
日期:——
New 4-(2-pyridyl)pyrimidines (L) have been synthesized in high yields by condensing enaminones with the appropriate carboxamidine or guanidine under basic conditions. These asymmetric bidentate diimine ligands coming from a one-step functionalization of amine and amino acid groups were complexed to ruthenium to obtain new heteroleptic complexes of type [Ru(bpy)2(L)]2+. The ligands and complexes have been characterized by usual analytical methods, and the crystallographic study of one complex has been performed. Their spectroscopic and electrochemical properties have been investigated. ZINDO Calculations show that in the MLCT excited state the electron is mainly localized on the pyridylpyrimidine ligand. On the basis of electrochemical data, the first reduction potential of the complexes has been assigned to the redox couple involving this ligand.
通过在碱性条件下将烯丙酮与适当的羧脒或胍缩合,已成功合成了新的4-(2-吡啶基)嘧啶(L)。这些不对称的双齿二亚胺配体来自胺基和氨基酸基团的一步官能化,与钌络合,得到新的异构络合物[Ru(bpy)2(L)]2+。通过常规分析方法对配体和络合物进行了表征,并对一种络合物进行了晶体学研究。对其光谱和电化学性质进行了研究。ZINDO计算表明,在MLCT激发态中,电子主要位于吡啶基嘧啶配体上。根据电化学数据,络合物的第一还原电位被分配给涉及该配体的氧化还原对。