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Electrochemical and Reactivity Studies of N→Sn Coordinated Distannynes
Author(s) -
Novák Miroslav,
Mikysek Tomáš,
Růžička Aleš,
Dostál Libor,
Jambor Roman
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703960
Subject(s) - redox , tin , chemistry , electrochemistry , reactivity (psychology) , cyclic voltammetry , transition metal , atom (system on chip) , crystallography , medicinal chemistry , stereochemistry , inorganic chemistry , catalysis , electrode , organic chemistry , medicine , alternative medicine , pathology , computer science , embedded system
Studies are focused on the redox potentials of N→Sn coordinated distannnynes {L 1–3 Sn} 2 (L 1 = 1 , L 2 = 2 and L 3 = 3 , in which L 1 is [C 6 H 3 ‐2,6‐(Me 2 NCH 2 ) 2 ] − , L 2 is [C 6 H 2 ‐2,4‐ t Bu 2 ‐6‐(Et 2 NCH 2 )] − and L 3 is [C 6 H 2 ‐2,4‐ t Bu 2 ‐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 1 Sn} 2 ⋅ Fe(CO) 4 ] ( 4 ) and [{L 2 Sn} 2 ⋅ Fe(CO) 4 ] ( 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 1–3 or Sn I →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 2 SnO)(L 2 )Sn(μ‐O)} 2 ( 6 ) as a consequence of the instability of the expected {L 2 Sn ⋅ TEMPO} complex. To support this proposed mechanism, the N→Ge coordinated digermyne {L 2 Ge} 2 ( 7 ) was prepared. The reaction of 7 with TEMPO provided the expected complex {L 2 Ge ⋅ TEMPO} ( 8 ).