| Abstract: To understand how the monodentate/bidentate pyridine-like ligands affect the reaction equilibrium, the interactions between diperoxovanadate complex [OV(O2)2(D2O)]-/[OV(O2)2(HOD)]- (abbr. bpV) and a series of pyridine-like ligands in solution were explored using multinuclear (1H, 13C, and 51V) magnetic resonance, COSY, HSQC, HMBC, and variable temperature NMR in 0.15 mol·L-1 NaCl ionic medium for mimicking the physiological condition. The reactivity among these organic ligands and bpV are 2,2′-bipyridine>4,4′-dicarboxylate-2,2′-bipyridine>pyridine>isonicotinate. The experimental results indicated that the coordinating ability of bidentate ligands is stronger than that of monodentate ligands, and the coordinating ability of unsubstituted ligands is stronger than that of corresponding carboxylate substituted ligands. The competitive coordination results in the formation of a series of new six-coordinated (pyridine or isonicotinate) or seven-coordinated (2,2′-bipyridine or 4,4′-dicarboxylate-2,2′-bipyridine) peroxovanadate species [OV(O2)2LL′]n- (LL′=pyridine-like ligands, n=1, 2, 3). |
| 于贤勇,季丹红,刘容华,黄昊文,李筱芳,郑柏树,汪朝旭,易平贵.双过氧钒配合物与吡啶类配体相互作用的NMR研究[J].无机化学学报,2010,26(4):639-644. |
