Synthesis and Cu(I)/Mo(VI) Reactivity of a Bifunctional Heterodinucleating Ligand on a Xanthene Platform
作者:Umesh I. Kaluarachchige Don、Sudheer S. Kurup、Thilini S. Hollingsworth、Cassandra L. Ward、Richard L. Lord、Stanislav Groysman
DOI:10.1021/acs.inorgchem.1c01735
日期:2021.10.4
two reactive sites mediated by H-bonding of the catechol protons. In the free ligand, catechol protons exhibit H-bonding with imine (intramolecular) and with pyridine (intermolecular in the solid state). The reaction of LH2 with [Cu(NCMe)4]+ led to the tetradentate coordination of Cu(I) via all nitrogen donors of the ligand, including the imine. Cu(I) complexes were characterized by multinuclear NMR
为了探索缺乏桥接硫基的 Mo-Cu CODH(CODH = 一氧化碳脱氢酶)模型的可行性,设计了新的异双核配体 LH 2并研究了其 Cu(I)/Mo(VI) 反应性. LH 2 (( E )-3-((((5-(bis(pyridin-2-ylmethyl)amino)-2,7-di- tert -butyl-9,9-dimethyl-9 H -xanthen-4-yl) )亚氨基)甲基)苯-1,2-二醇)具有两个不同的螯合位置,由呫吨连接体桥接:双(吡啶基)胺用于 Cu(I)和儿茶酚酸酯用于 Mo(VI)。LH 2通过对胺位置之一进行初始保护,然后对第二个位置进行两次连续烷基化、脱保护和缩合以连接邻苯二酚官能团来合成。发现LH 2表现出由儿茶酚质子的氢键介导的两个反应位点之间的动态协同作用。在游离配体中,儿茶酚质子与亚胺(分子内)和吡啶(固态分子间)显示氢键。LH 2与[Cu(NCMe) 4