Structural characterization, hydrolytic stability and dynamics of cis-MoVIO22+ hydroquinonate/phenolate complexes
作者:Chryssoula Drouza、Sofia Hadjithoma、Maria Nicolaou、Anastasios D. Keramidas
DOI:10.1016/j.poly.2018.06.008
日期:2018.9
the biological systems, the MoVI complexes of phenolate/hydroquinonate and their functionalized variants remain mainly unexplored. Reaction of Na2MoVIO4 with tripod iminodiacetate phenol/hydroquinone ligands in aqueous solutions resulted in the synthesis of mononuclear phenolate/hydroquinonate and dinuclear bridged-hydroquinonate cis-MoVIO22+ complexes. The new complexes were isolated and characterized
摘要尽管研究MoVI离子与“非纯”酚/对苯二酚的相互作用对于理解钼在生物系统中的作用至关重要,但酚盐/对苯二酚的MoVI配合物及其功能化变体仍未开发。Na2MoVIO4与三亚氨基二乙酸酯苯酚/对苯二酚配体在水溶液中的反应导致单核酚盐/对苯二酚和双核桥连氢醌的顺式-MoVIO22 +配合物的合成。分离出新的复合物,并通过X射线晶体学表征为固态。配合物水溶液的1H,13C和95Mo NMR光谱表明,它们在pD范围2-4范围内保持其结构,与双核桥连的氢醌酸盐顺式-MoVIO22 +形成两个处于动态平衡状态的异构体。在第4-7天,顺式MoVIO22 +化合物的MoVI-O酚酸酯键水解形成MoVIO3-亚氨基二乙酸酯。可变温度(VT)和2D 1H} EXSY NMR光谱用于确定双核桥接氢醌的顺式MoVIO22 +异构体之间的异构化反应的热力学和活化参数。还通过二维1H} EXSY NMR光谱研究了顺式MoVIO22