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Alkylxanthates are most widely used as flotation reagents in concentration of nonferrous metal sulfide ores. Hence, complexation between transition metals and alkylxanthate ligands can be of interest for the flotation theory in order to understand better how ions of flotation reagents interact with the surface of mineral particles.Previously [1], we synthesized and studied using ESR and high-resolution solid-state 13 C CP/MAS NMR spectroscopy crystalline Ni(II) and Cu(II) complexes of the general formula [M { S ( S ) COR } 2 ] (M = Ni, 63 Cu , and 65 Cu) with five alkylxanthate ligands R ï an -. In Cu(II) complexes stabilized in the matrix of nickel(II) compounds, planar chromophores [CuS 4 ] were found to undergo rhombic distortion. In all Ni(II) complexes, the -OC(S)S-fragments exhibited intramolecular structural equivalence.The goal of this study was to synthesize and investigate the structures and spectral properties of crystallinei -C 4 H 9 , s -C 4 H 9 , and C 5 H 11 ) and isotope-substituted heteropolynuclear Cu(II)Tl(I) complexes [ 63(65) CuTl 6 ( S 2 COR ) 8 ] (R = i -C 4 H 9 and C 5 H 11 ) by ESR and 13 C CP/MAS NMR spectroscopy. EXPERIMENTAL Thallium(I) alkylxanthate complexes of the general formula [ Tl ( S 2 COR )] n 1 (R = C 2 H 5 ( I ), i -C 3 H 7 ( II ), i -C 4 H 9 ( III ), s -C 4 H 9 ( IV ), and C 5 H 11 ( V ) ) were synthe-Abstract-Crystalline thallium(I) alkylxanthate complexes [Tl{S(S)COR}] n (R = C 2 H 5 , i-C 3 H 7 , i-C 4 H 9 , s-C 4 H 9 , and C 5 H 11 ) and isotope-substituted heteropolynuclear Cu(II)Tl(I) complexes [ 63(65) CuTl 6 (S 2 COR) 8 ] (R = i-C 4 H 9 and C 5 H 11 ) were obtained and studied by ESR and high-resolution solid-state 13 C CP/MAS NMR spectroscopy. According to the 13 C NMR data, polynuclear thallium(I) complexes contain structurally equivalent alkylxanthate ligands. The ESR study revealed the Jahn-Teller dynamic effect in Cu(II)Tl(I) complexes; the nuclei of six Tl atoms are involved in the hyperfine interaction.

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