Abstract
The neutral and lipophilic complex [2,9-dimethyl-4,7-diaza-2,9-decanedithiolato]oxorhenium(V) was synthesized and characterized by FT-IR, UV, mass and NMR spectroscopies. X-ray crystallographic analysis of the complex (C 10H 21N 2OS 2Re) showed that the complex crystallizes in the monoclinic space group C2/ c with a = 21.357(2), b = 13.615(1), c = 20.778(2) Å, β = 8.648(3)°, V = 5973.0(9) Å 3, z = 16. Detailed NMR studies revealed that in CDCl 3 and CD 3OD solutions the amine proton of the complex is labile and undergoes exchange between the two nitrogens of the complex. Evidence is presented that the nature of the exchange is intermolecular. In the presence of DCl, both in CD 3OD and D 2O solutions, the complex is protonated on both nitrogens while in the presence of NaOD the complex is completely deprotonated. Protonation/deprotonation of the complex are completely reversible processes as evidenced by NMR.
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