Novel Stannatranes of the Type N(CH2CMe2O)3SnX (X = OR, SR, OC(O)R, SP(S)Ph2, Halogen). Synthesis, Molecular Structures, and Electrochemical Properties

The syntheses of the stannatrane derivatives of the type N­(CH2CMe2O)3SnX (1, X = Ot-Bu; 2, X = Oi-Pr; 3, X = 2,6-Me2C6H3O; 4, X = p-t-BuC6H4O; 5, X = p-NO2C6H4O; 6, X = p-FC6H4O; 7, X = p-PPh2C6H4O; 8, X = p-MeC6H4S; 9, X = o-NH2C6H4O; 10, X = OCPh2CH2NMe2; 11, X = Ph2P­(S)­S; 12, X = p-t-BuC6H4C­(O)­O; 13, X = Cl; 14, X = Br; 15, X = I; 16, X = p-N­(CH2CMe2O)3SnOSiMe2C6H4SiMe2O) are reported. The compounds are characterized by X-ray diffraction analyses (3–8, 11–16), multinuclear NMR spectroscopy, 13C CP MAS (14) and 119Sn CP MAS NMR (13, 14) spectroscopy, mass spectrometry and osmometric molecular weight determination (13). Electrochemical measurements show that anodic oxidation of the stannatranes 4 and 8 occurs via electrochemically reversible electron transfer resulting in the corresponding cation radicals. The latter were detected by cyclic voltammetry (CV) and real-time electron paramagnetic resonance spectroscopy (EPR). DFT calculations were performed to compare the stannatranes 4, 8, and 13 with the corresponding cation radicals 4 +•, 8 +•, and 13 +•, respectively.