By employing the synergistic extraction technique, vanadium (V,IV) has been found to form the primary dithizonate in the presence of a synergist. The extraction of the element proceeds according to the following equations.VO2++H2dz,org+TBPOorg\ightleftharpoonsVO2(Hdz)(TBPO)Org+H+,andVOOH++H2dz,org\ightleftharpoonsTOPOorg\ightleftharpoonsVOOH(Hdz)(TOPO)org+H+,where H2dz, TBPO, and TOPO denote dithizone, tributylphosphine oxide and trioctylphosphine oxide, respectively, and the subscript org indicates the benzene phase. The resulting adduct VO2(Hdz)(TBPO) has an absorption maximum at 503 nm and is stable for at least 1 h. However, the red color of VOOH(Hdz)(TOPO) in benzene fades away during the standing time, probably due to the dimerization of the initially extracted monomeric species.
通过采用协同萃取技术,
钒 (V,IV) 被发现在协同剂存在下形成初级二
硫氮酸盐。元素的提取按照以下方程进行。VO2++H2dz,org+T
BPOorg\ightleftharpoonsVO2(Hdz)(T
BPO)Org+H+,和VOOH++H2dz,org\ightleftharpoonsTOPOorg\ightleftharpoonsVOOH(Hdz)(TOPO)org+ H+,其中H2dz、T
BPO和TOPO分别表示二
硫腙、
三丁基氧化膦和
三辛基氧化膦,下标org表示苯相。所得加合物 VO2(Hdz)(T
BPO) 在 503 nm 处具有最大吸收,并且稳定至少 1 小时。然而,苯中 VOOH(Hdz)(TOPO) 的红色在静置时间内逐渐消失,这可能是由于最初提取的单体物质的二聚化所致。