氧钒(Ⅳ)-碳酸氢根水溶液配合反应的研究

Studies on Coordination Reactions of Oxovanadium(IV)-Hydrocarbonate System in Aqueous Solution

本文应用溶解度法和电子光谱研究了氧钒(Ⅳ)-碳酸氢根水溶液体系的配合反应。在15±2℃,恒定离子强度Ⅰ=1.0的条件下,测得溶液中[VO^(2+)]<0.012M时,钒(Ⅳ)仅以单核配离子VO(CO_3)(OH)^-存在;当[VO^(2+)]在0.014～0.035M之间时,以5核配离子(VO)_5(CO_3)_5(OH)_5^(5-)和(VO)_5(CO_3)_5(OH)_6^(6-)的混合物存在;当[VO^(2+)]>0.035M时,则存在6核配离子(VO)_6(CO_3)_4(OH)_9^(5-)。同时测定了有关反应的平衡常数。

The coordination reactions for oxovanadium(Ⅳ)-hydrocarbonate system inaqueous solution have been studied by solubility equilibria and electronic spec-troscopy. At 15±2℃ and at a constant ionic strength (I=1.0), it has been con-firmed that only the mononuclear coordinate ion (VO) (CO_3) (OH)^- is presentedas the vanadium(Ⅳ) species in [VO^(2+)]<0.012M solution, and found that the mixof the pentanuclear coordinate ions (VO)_5 (CO_3)_5 (OH)_(5-)5 and (VO)_5(CO_3)_5 (OH)_(6-)~6are in[VO^(2+)]=0.014～0.035M solution and the hexanuclear coordinate ion (VO)_6(CO_3)_4(OH)_(9-)~5 is in [VO^(2+)]>0.035M solution. The values of the equilibrium con-stants of certain reactions have also been estimated.