Metal selenocarboxylate salts (PPh4)[M(SeC{O}Tol)3]
(M = Zn (1), Cd (2) and Hg (3); Tol = C6H4-p-CH3) have been synthesized by reacting Zn(NO3)2·6H2O, Cd(NO3)2·4H2O or HgCl2 with Na+TolC{O}Se− and PPh4Cl in the ratio of 1 ∶ 4 ∶ 1. The structures of these compounds were determined by single-crystal X-ray diffraction methods. The crystal structures contain discrete cations and anions. In the each anion, the metal center is bound to three TolC{O}Se ligands, primarily through Se, though some long M⋯O interactions also occur. NMR spectra (113Cd, 199Hg and 77Se, as appropriate) are reported for solutions of [M(SeC{O}Tol)3]−, and of [M(SeC{O}Tol)3]−–[M(SC{O}Ph)3]− mixtures (M = Zn–Hg), in CH2Cl2 at reduced temperatures. In addition, ESI-MS data have been obtained for [M(SeC{O}Tol)3]−–[M(SC{O}Ph)3]− mixtures (M = Zn–Hg) in acetone and in CH2Cl2. The NMR and ESI-MS studies show that the complexes [M(SeC{O}Tol)n(SC{O}Ph)3−n]−
(n
= 3–0) persist in solution.
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