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olyoxometalate-based metal – organic complexes with di ff erent rigid pyridyl-bis ( triazole ) ligands : assembly , structures and electrochemical properties †
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wang, Xiu-Li Lin, Hongyan Sun, Junjun Wang, Xiang-Li Liu, Guocheng |
| Copyright Year | 2018 |
| Abstract | Five new polyoxometalate (POM)-based metal–organic complexes (MOCs) with different rigid pyridylbis(triazole) ligands, namely, H{Co2(Hpyttz-I)2(H2O)6[CrMo6(OH)6O18]}$8H2O (1), {Co2(H2pyttzI)2(H2O)4[TeMo6O24]}[Co(H2O)6]$3H2O (2), {Co3(Hpyttz-II)2(H2O)6[g-Mo8O26]}$10H2O (3), {Ni3(HpyttzII)2(H2O)6[g-Mo8O26]}$10H2O (4), {Ni3(Hpyttz-III)2(H2O)8[g-Mo8O26]}$10H2O (5) (H2pyttz-I 1⁄4 3-(pyrid-2yl)-5-(1H-1,2,4-triazol-3-yl)-1,2,4-triazolyl, H2pyttz-II 1⁄4 3-(pyrid-3-yl)-5-(1H-1,2,4-triazol-3-yl)-1,2,4triazolyl, H2pyttz -III 1⁄4 3-(pyrid-4-yl)-5-(1H-1,2,4-triazol-3-yl)-1,2,4-triazolyl), were successfully synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). Complex 1 is a two-dimensional (2D) supramolecular network based on the binuclear complex unit: [Co2(Hpyttz-I)2(H2O)6 [CrMo6(OH)6O18]]. Complex 2 is a 1D supramolecular chain derived from the binuclear cobalt complex: {Co2(H2pyttzI)2(H2O)4[TeMo6O24]} 2 , the discrete [Co(H2O)6] 2+ units act as counter cations. Complexes 3 and 4 are isostructural with different center metals (M 1⁄4 Co or Ni), the adjacent g-Mo8O26 anions are linked by the M ions to form a 1D M-g-Mo8O26 inorganic chain. Then 1D M-g-Mo8O26 inorganic chains are linked together by the 1D metal–organic M-(Hpyttz-II) chains to form a 3D framework. In complex 5, gMo8O26 4 anions are bridged by the Ni ions to give a 1D Ni-g-Mo8O26 inorganic chain, the adjacent 1D Ni-g-Mo8O26 chains are connected through [Ni(Hpyttz-III)2] units to form a 2D layer. The effect of POM type and coordination site of the ligands on the structures of the title complexes were discussed. The title complexes 1, 2 and 5 exhibit excellent bifunctional electrocatalytic activities toward the reduction of bromate/hydrogen peroxide and the oxidation of ascorbic acid. In addition, the redox potentials of complexes 1, 2 and 5 are highly sensitive to pH and may be used as a kind of potential pH sensor. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://pubs.rsc.org/en/content/articlepdf/2018/ra/c8ra03277g |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
