在模拟生理条件下(0.15mol/LNaCl溶液),应用多核(^1H和^51V)多维(DOSY)NMR以及变温技术等谱学方法研究双过氧钒配合物[OV(O2)2(D2O)r/[OV(O2)2(HOD)]-(简写为bpV)与4,4′-联吡啶(简写为bipy)的相互作用,竞争配位的结果,导致溶液中既有6配位的过氧钒物种[OV(O2)2(bipy)]-的生成,还有[(OV(O2)2(bipy)]^2-(6配位)的存在,采用密度泛函理论(B3LYP方法),在3-21+G^*水平下计算表明,bipy和bpV生成[OV(O2)2(bipy)]-和[OV(O2)2)2(bipy)]^2-的△G分别为-53.35和-55.85kJ/mol,较好地支持了实验结果。图5,参11。
The interaction between diperoxovanadate complex [OV(O2)2(D2O)]-/[OV (O2)2(HOD )]^- (abbr. bpV) and 4,4′-hipyridine (abbr. bipy) in solution were explored using multinuclear (^1H arid 51V) magnetic resonance, DOSY, and variable temperature NMR in 0.15 mol/l NaCl ionic medium for mimicking the physiological conditions. Competitive coordination interactions result in two new six-coordinated peroxovanadate species, [OV(O2)2(hipy)]^- and [(OV(O2)2)2 (hipy)]^2-, respectively. The density functional theory calculations based on 3-21+G^* indicated that the free energies of the form of [OV(O2)2( bipy)]^- or [(OV(O2)2)2( bipy)]^2- is -53.35 and -55.85 kJ/mol, which provided a reasonable explanation on the experimental results. 5figs., 11refs.