Synthesis and structures of organoantimony compounds containing intramolecular Sb–N interactions

Stibines View the MathML sourceR3′Sb containing the pendant arm [2-(Me2NCHR)C6H4] (where R = H or Me) were synthesized, and their reactions with CH3I and HBr have been carried out to obtain the diammonium salt {[2-(Me2NCHR)C6H4] [2-(Me3N+CHR)C6H4]}Sb 2[I]− (where R = H 3; Me 4) and triammonium salt {2-[(Me2HN+CH2)C6H4]3}Sb 3[Br]−5, respectively. A novel platinum complex 6 [PtCl2 · 1] containing stibine 1 as a bidentate ligand has also been prepared. All these compounds show Sb–N interactions. A good conjunction was observed between semi-empirical method and 1H and 13C NMR (at different temperature) data for the diammonium salts of compounds 3 and 4. The structures of all the synthesized compounds were determined by X-ray diffraction analyses. This appears to be the second molecular structure of a Pt stibine complex containing a Pt–Cl bond trans to stibine ligand, as few Pt–Sb X-ray structures are known.