Synthesis and Luminescence Properties of Cr(III) Complexes with Cyclam-Type Ligands Having Pendant Chromophores, <i>trans</i>-[Cr(L)Cl<sub>2</sub>]Cl<sup>1</sup>
作者:Frank DeRosa、Xianhui Bu、Kristina Pohaku、Peter C. Ford
DOI:10.1021/ic048312g
日期:2005.6.1
The synthesis and spectroscopic properties of new cyclam-type ligands 5,7-dimethyl-6-R-1,4,8,11-tetraazacyclotetradecane (L), where R is a pendant chromophore such as an anthracene derivative, are reported. These ligands were prepared according to a nickel(II) template procedure, and the X-ray crystal structures of several Ni(II) intermediates are described. Reaction of the free base ligands L with
据报道,新的Cyclam型配体5,7-二甲基-6-R-1,4,8,11-四氮杂环十四烷(L)的合成和光谱性质,其中R是侧基生色团,如蒽衍生物。根据镍(II)模板程序制备这些配体,并描述了几种镍(II)中间体的X射线晶体结构。游离碱配体L与CrCl(3)x3THF的反应导致反式[[Cr(L)Cl(2)] Cl络合物的容易形成,并且还描述了这些络合物的结构和光谱表征。在77 K时对反式[[Cr(L)Cl(2)] Cl溶液的光物理性质进行了研究,结果表明发射光谱受铬(III)中心配体场二重态的磷光控制。这也适用于Cr(III)络合物反式[[Cr(mac)Cl(2)] Cl,其中mac是蒽衍生物5,7-二甲基-6-蒽基环酰胺。激发进入蒽的pi-pi(*)状态会导致该发色团的荧光显着淬灭,并导致以金属为中心的双重态引起的敏化磷光。