Abstract
The thioderivative of 2-thenoyltrifluoroacetone, 1,1,1-trifluoro-4-(2-thienyl) 4-mercaptobut-3-en-2-one (STTA) was prepared. NMR and infrared spectra confirmed the previously suggested structure2. The sulfur is attached to the carbon adjacent to the thienyl group and exists almost entirely in the thio-enolic form. The chelates of STTA with Ni(II), Cu(II), Pb(II), Zn(II). Co(II), Cd(II). Pd(II) and Hg(II) were prepared in a neutral to slightly basic medium, and characterized by analysis. NMR, infrared, visible and ultraviolet spectra, DTA, TGA and fractional sublimation. The chelates are relatively stable, insoluble in water, soluble in non-polar and some polar organic solvents, sublimable, and intensely colored compared to their normal diketone analogs. The selectivity of the reagent has not been completely established but divalent ions chelate more readily than trivalent ions; Fe(III), Al(III), Cr(III) apparently do not chelate. The new chelon may be useful as a color-developing reagent for the colorimetric analysis of such ions as Zn(II), Cd(II), Hg(II) and Pb(II). The molar extinction coefficients are given for the chelon and the chelates investigated
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