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Electrochemical and Reactivity Studies of N→Sn Coordinated Distannynes. | LitMetric
Studies are focused on the redox potentials of N→Sn coordinated distannnynes {L Sn} (L =1, L =2 and L =3, in which L is [C H -2,6-(Me NCH ) ] , L is [C H -2,4-tBu -6-(Et NCH )] and L is [C H -2,4-tBu -6-(DippN=CH)] ; Dipp=2,6-diisopropylphenyl), containing the tin atom in oxidation state +I. Distannynes 1-3 were used as ligands for transition metals, and complexes [{L Sn} ⋅Fe(CO) ] (4) and [{L Sn} ⋅Fe(CO) ] (5) were prepared. The set of N→Sn coordinated distannynes 1-5 was studied by cyclic voltammetry measurements and the oxidation potentials of tin atoms in 1-5 were determined. The redox potentials are influenced by either ligands L or Sn →Fe coordination. Oxidation reactions of 1-3 were also studied. The reaction of 2 with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) provided mixed organotin oxide {(L SnO)(L )Sn(μ-O)} (6) as a consequence of the instability of the expected {L Sn⋅TEMPO} complex. To support this proposed mechanism, the N→Ge coordinated digermyne {L Ge} (7) was prepared. The reaction of 7 with TEMPO provided the expected complex {L Ge⋅TEMPO} (8).
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