Tetrahydroxy-<i>p</i>-benzoquinone as a Source of Polydentate O-Donor Ligands. Synthesis, Crystal Structure, and Magnetic Properties of the [Cu(bpy)(dhmal)]<sub>2</sub> Dimer and the Two-Dimensional [{SiW<sub>12</sub>O<sub>40</sub>}{Cu<sub>2</sub>(bpy)<sub>2</sub>(H<sub>2</sub>O)(ox)}<sub>2</sub>]·16H<sub>2</sub>O Inorganic−Metalorganic Hybrid
作者:Santiago Reinoso、Pablo Vitoria、Leire San Felices、Ainara Montero、Luis Lezama、Juan M. Gutiérrez-Zorrilla
DOI:10.1021/ic061671m
日期:2007.2.19
dihydroxymalonato and oxalato ligands led to the isolation under open-air mild reaction conditions of five different compounds, two of them prepared for the first time: [Cu(bpy)(dhmal)]2 (1) and [SiW12O40}Cu2(bpy)2(H2O)(ox)}2].16H2O (5) (bpy, 2,2'-bipyridine; dhmal, dihydroxymalonate; ox, oxalate). A possible mechanism for the oxidation of the benzoquinone to give the croconate dianion, which undergoes
使用四羟基对苯醌作为二羟基丙二醛和草酸酯配体的缓慢来源,导致在露天温和反应条件下分离出五种不同的化合物,其中两种是首次制备:[Cu(bpy)(dhmal) ] 2(1)和[SiW12O40} Cu2(bpy)2(H2O)(ox)} 2] .16H2O(5)(bpy,2,2'-联吡啶; dhmal,二羟基丙二酸酯; ox,草酸酯)。提出了一种可能的机制,用于氧化苯醌生成苯甲酸二酐,然后再进行开环氧化分解为二羟基丙二酸酯和草酸酯。所有化合物均已通过元素分析,热重分析,红外光谱和粉末X射线衍射进行了表征。对化合物1和5进行了单晶X射线衍射,电子顺磁共振和磁化率测量。通过与使用密度泛函理论(DFT)计算的光谱进行比较,给出了实验FT-IR光谱的完整波段分配。中性二聚体1构成过渡金属-dhmal配合物的第一个结构特征性实例,它包含两个铜原子,两个铜原子由两个以mu2-kappa3O,O',O“: