The substitution reaction of quinin e by the 18types of heteropoly comple xes,for these formed compounds are Keggin structure and the molecular f ormulas arXM 11 O 39 M’ (OH) 2 6- (X =Si,Ge,P;M=Mo or W;M’ =Co,Ni,Cu)...The substitution reaction of quinin e by the 18types of heteropoly comple xes,for these formed compounds are Keggin structure and the molecular f ormulas arXM 11 O 39 M’ (OH) 2 6- (X =Si,Ge,P;M=Mo or W;M’ =Co,Ni,Cu),was studied by the means of phase tra nsfer.The results of characterization that were accomplished by UV and ESR indicated that the quinine does f orm the chemical bond with the hetrop oly ligands.Spectral experiment demonstrated that the structure held the same when the heteropoly comple x contained Cu 2+ was reacted with qui-nine,while the heteropoly complex c ontained Ni 2+ resulted in the changing of the structure.Such a result of op-tical rotatory opticity testified t hat quinine reacting with heteropoly acid contained transitional metals could form a kind of new complexes which were opti cal rotation.展开更多
Many papers have been published on the analysis of metal cations by capillary electrophoresis (CE), for example, lanthanide, transition metal, alkali, and alkaline earth metal ions. Separations of metal ions are based...Many papers have been published on the analysis of metal cations by capillary electrophoresis (CE), for example, lanthanide, transition metal, alkali, and alkaline earth metal ions. Separations of metal ions are based on the differences in their electrophoretic mobilities. Since most metal ions having identical charge and size give rise to identical electrophoretic mobilities, the direct electrophoretic separation of these ions is impossible. However, their mobilities can be modified by introducing chemical equilibria in which the ions are involved in forming complexes. If metal ions have different complex formation constants, their apparent electrophoretic mobilities differ. The separation process is mainly carried out by using various weak complexing agents[1-4], which complex the metal ions to different extents. The weak complexing agents for metal ion separation primarily are hydroxycarboxylic acids with hydroxyl and carboxyl groups. In addition, organic solvents have also been added into the electrolytes to improve the selectivity of metal ion separation. When a metal ion interacts with polar solvent molecules through ion-dipole bonds, a solvation shell may be formed around the central ion. In principle, the solvent solvates all kinds of ions in solution, some to a greater extent than others, depending on the specific properties of the central ion regarding a certain solvent. The use of pure nonaqueous systems offers potential for adjustment of relative migration rates via changes in solvent-ion interaction. Evidence for such analyte-electrolyte interaction has been reported for the separations of inorganic anions[5] and alkali, alkaline earth and transition metal ions in pure nonaqueous systems[6-8].展开更多
文摘The substitution reaction of quinin e by the 18types of heteropoly comple xes,for these formed compounds are Keggin structure and the molecular f ormulas arXM 11 O 39 M’ (OH) 2 6- (X =Si,Ge,P;M=Mo or W;M’ =Co,Ni,Cu),was studied by the means of phase tra nsfer.The results of characterization that were accomplished by UV and ESR indicated that the quinine does f orm the chemical bond with the hetrop oly ligands.Spectral experiment demonstrated that the structure held the same when the heteropoly comple x contained Cu 2+ was reacted with qui-nine,while the heteropoly complex c ontained Ni 2+ resulted in the changing of the structure.Such a result of op-tical rotatory opticity testified t hat quinine reacting with heteropoly acid contained transitional metals could form a kind of new complexes which were opti cal rotation.
文摘Many papers have been published on the analysis of metal cations by capillary electrophoresis (CE), for example, lanthanide, transition metal, alkali, and alkaline earth metal ions. Separations of metal ions are based on the differences in their electrophoretic mobilities. Since most metal ions having identical charge and size give rise to identical electrophoretic mobilities, the direct electrophoretic separation of these ions is impossible. However, their mobilities can be modified by introducing chemical equilibria in which the ions are involved in forming complexes. If metal ions have different complex formation constants, their apparent electrophoretic mobilities differ. The separation process is mainly carried out by using various weak complexing agents[1-4], which complex the metal ions to different extents. The weak complexing agents for metal ion separation primarily are hydroxycarboxylic acids with hydroxyl and carboxyl groups. In addition, organic solvents have also been added into the electrolytes to improve the selectivity of metal ion separation. When a metal ion interacts with polar solvent molecules through ion-dipole bonds, a solvation shell may be formed around the central ion. In principle, the solvent solvates all kinds of ions in solution, some to a greater extent than others, depending on the specific properties of the central ion regarding a certain solvent. The use of pure nonaqueous systems offers potential for adjustment of relative migration rates via changes in solvent-ion interaction. Evidence for such analyte-electrolyte interaction has been reported for the separations of inorganic anions[5] and alkali, alkaline earth and transition metal ions in pure nonaqueous systems[6-8].
