ELECTROCHEMISTRY AND ANALYTICAL APPLICATION OF THE TIN(IV) COMPLEX OF N-BENZOYL-N-PHENYLHYDROXAMIC ACID IN 2-PROPANOL SOLUTION

The tin(IV) complex of N-benzoyl-N-phenyl-hydroxamic acid (HX) and chloride ions [Sn(IV)X(2)Cl(2)l(2)](0) is reduced in 2-propanol solution via two different pathways depending on the scan rate. At scan rates higher than 20 mV/s, the reduction proceeds via [Sn(II)X(2)Cl(2)](2-) and [Sn(0)X(H2O)(2)](-), and at slower scan rates the reduction proceeds via [Sn(II)XCl(3)](2-) and [(SnCl)-Cl-0(H2O)(2)](-). This is the first time that experiments have indicated the existence of tin(0) complexes. The studied tin(IV) complex can be used for the determination of tin traces in aqueous solutions. Therefore the tin(IV) complex is preliminarily extracted from aqueous solution and the differential pulse anodic stripping voltammograms are recorded in the organic solution after addition of 2-propanol. The 3 sigma limit of detection is 4 x 10(-8) mol/L.