Transition Metal Complexes Containing Quinone and Hydroxyquinone Ligands

在化学部无机、生物无机和有机金属项目的这个项目中，Pierpont将继续研究含有电活性有机配体的过渡金属配合物。研究了含儿茶酚酸、半醌和相关电活性有机配体的过渡金属配合物的合成和表征。这些配合物在金属或配体上表现出选择性氧化还原活性，从而允许研究分子内金属-醌电子转移反应。研究了铂族金属醌配合物的光化学和光物理性质。将研究多核络合物在光转化过程中作为催化剂的活性。分子内金属醌电子转移反应中的电子效应及其与生物无机反应的潜在关系将在金属酶过程的功能模型中进行研究。儿茶酚、醌和其他类醌分子是生物系统的常见成分，它们通常与金属离子一起起作用。在某些情况下，这些分子在金属的结合和运输中起作用，在其他情况下，它们的金属配合物在电子转移和/或底物活化中起作用。本课题拟合成的半醌和儿茶酚酸金属配合物可作为类似天然分子的模型。

In this project in the Inorganic, Bioinorganic, and Organometallic Program of the Chemistry Division, Pierpont will continue studies on transition metal complexes that contain electroactive organic ligands. The synthesis and characterization of transition metal complexes that contain catecholate, semiquinone, and related electroactive organic ligands will be pursued. These complexes exhibit selective redox activity at either the metal or ligand, thus allowing investigation of intramolecular metal-quinone electron transfer reactions. The photochemical and photophysical properties of quinone complexes of the platinum group metals will be examined. Multinuclear complex ensembles will be investigated for their activity as catalysts in photoconversion processes. Electronic effects in intramolecular metal-quinone electron transfer reactions and their potential involvement with bioinorganic reactions will be studied in functional models for metalloenzymatic processes. %%% Catechols, quinones and other quinoid molecules are common components of biological systems, in which they usually function in association with metal ions. In some cases these molecules function in the binding and transport of metals, and in other cases their metal complexes have a role in electron transfer and/or substrate activation. The semiquinone and catecholate metal complexes which will be synthesized in this project will serve as models of the similar natural molecules.