Fe(III) and Cu(II) coordination polymers assembled from di/tris-phosphonic acid and auxiliary ligands:Structure, SOD-like activity and magnetic behavior
作者:Lu Feng、Hong Zhou、Hailong Xu、Wentao Huang、Tianyu Zeng
DOI:10.1016/j.jssc.2018.07.008
日期:2018.10
2 and 3 feature 3D framework structures with 3, 3, 3, 4-connected and 4, 5-connected topology; 1 and 4 display 1D chain structures, while 5 has a dimer structure. The di- or trisphosphonate ligands (H4L1 and H6L2) in the five complexes adopt different coordination modes and auxiliary ligands (4, 4′-bipy and 2, 2′-bipy) control the dimensionality of the final complexes. The superoxide dismutase (SOD)
(苄基氮杂二基)双(亚甲基)-二膦酸(H 4 L 1)或(苯-1,3,5-三基三(亚甲基))三膦酸(H 6 L 2 )与Fe(III)/ Cu( II)硝酸盐和4,4'-联吡啶或2,2,'-联吡啶产生五个新的膦酸酯,即[FeHL 1(H 2 O)] n(1),[Cu 2 L 1(4,4' -bipy)0.5(H 2 O)]·0.25H 2 O} n(2),[Cu 2 H 2 L 2(4,4'-bipy)(H 2 O)2 ] n(3),[CuH 4 L 2(2,2' -bipy)] n(4)和[Cu 2(H 4 L 2)2(2,2'-bipy)2(H 2 O)4 ](5)。X射线结构分析表明2和3具有3、3、3、4连接和4、5连接拓扑的3D框架结构。图1和4显示1D链结构,而5显示二聚体结构。二膦酸酯或三膦酸酯配体(H五个配合物中的4 L 1和H 6 L 2 )采用不同的配位方式,辅助配体