Fe(III) and Cu(II) coordination polymers assembled from di/tris-phosphonic acid and auxiliary ligands : Structure, SOD-like activity and magnetic behavior
Feng, Lu; Zhou, H; Xu, H; Huang, W; Zeng, T; ,
| HERO ID | 6943260 |
|---|---|
| In Press | No |
| Year | 2018 |
| Title | Fe(III) and Cu(II) coordination polymers assembled from di/tris-phosphonic acid and auxiliary ligands : Structure, SOD-like activity and magnetic behavior |
| Authors | Feng, Lu; Zhou, H; Xu, H; Huang, W; Zeng, T; , |
| Journal | Journal of Solid State Chemistry |
| Page Numbers | 83-92 |
| Abstract | Hydrothermal reactions of (benzylazanediyl)bis(methylene)-diphosphonic acid (H4L1) or (benzene-1,3,5-triyltris(methylene))triphosphonic acid (H6L2) with Fe(III)/Cu(II) nitrate and 4, 4'-bipy or 2, 2'-bipy result in five new phosphonates, namely, [FeHL1(H2O)](n) (1), {[Cu(2)(L)1(4, 4'-bipy)(0.5) (H2O)].0.25H(2)O}(n) (2), [Cu2H2L2(4, 4'-bipy)(H2O)2](n), (3), [CuH4L2(2, 2'-bipy)](n) (4) and [Cu-2(H4L2)2(2, 2'-bipy)(2)(H2O)(4)] (5), respectively. X-ray structural analysis indicates that 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) activities of 2-5 were assessed by modified nitrobluetetrazolium (NBT) assay. The IC50 values required to yield 50% inhibition of the reduction of NBT are 1.84, 2.02, 6.95 and 1.70 M for 2-5, respectively, demonstrating better SOD-like activity than most of the Cu-SOD mimic enzymes reported in literatures. Among them, 2 and 3 have good stability and reusability under the simulative physiological conditions. The dismutation of 4 and 5 toward superoxide anion radicals can be attributed to the synergistic effect of the decomposition products of 4 and 5 containing Cu(II) and [H4L2](2-)with or without 2, 2'-bipy or Cu(II) and 2, 2'bipy, which were identified by liquid mass spectrometry (LC/MS). The magnetic properties of complexes 1-4 were also investigated, indicating the presence of magnetic exchange between metal ions. The results show that 1 and 3 exhibit antiferromagnetic interactions, while 2 and 4 show ferromagnetic interactions between metal centres. |
| Doi | 10.1016/j.jssc.2018.07.008 |
| Wosid | WOS:000444664800012 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |