New ionic [{2-(Me2NCH2)C6H4}(R)Sn{(EPPh2)2N}][(EPPh2)2N] (R = 2-(Me2NCH2)C6H4, nBu; E = O, S, Se) compounds. Solution behaviour and solid state structure

Denes E.;Marongiu L.;Arca M.;Lippolis V.;Silvestru A.

2022-01-01

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Abstract

The new compounds [{2-(Me2NCH2)C6H4}(R)Sn{(EPPh2)2N}][(EPPh2)2N] [R = 2-(Me2NCH2)C6H4, E = O (1), S (2), Se (3) and R = nBu, E = O (4), S (5), Se (6)] were prepared by salt metathesis reactions between [2-(Me2NCH2)C6H4](R)SnCl2 and the potassium salt of the corresponding tetraorganodichalcogenoimidodiphosphinic acid in a 1:2 molar ratio. The multinuclear NMR studies (1H, 13C, 31P, 119Sn, and 77Se where appropriate) showed the equivalence of the 2-(Me2NCH2)C6H4 groups in 1 - 3 and non-equivalent organophosphorus ligands in 1 - 6. The compounds behave as 1:1 electrolytes in solution, with [{2-(Me2NCH2)C6H4}(R)Sn{(EPPh2)2N}]+ cations and [(EPPh2)2N]− anions. The single-crystal X-ray diffraction studies revealed an ionic structure for 2 and 3. An octahedral coordination environment is realized about tin by two C,N-coordinated 2-(Me2NCH2)C6H4 groups and a κ2-E,E'-chelating organophosphorus [(EPPh2)2N]ˉ anionic ligand. We found a dimeric structure with bridging OHˉ groups and monodentate S-organophosphorus ligands for the hydrolysis product [{2-(Me2NCH2)C6H4}(nBu)Sn(OH){(SPPh2)2N}]2 (5h).