Synthesis and coordination chemistry of a tris(benzene-o-dithiolato)- functionalized ligand as a siderophore analog

摘要

As a siderophore analog, the tripodal tris(benzene-o-dithiol)- functionalized ligand H_6-5, has been synthesized in four steps including the reaction of 1,3,5-(triaminomethyl)-2,4,6-triethylbenzene and 2,3-bis(isopropylmercapto)benzoyl chloride followed by removal of the S-protecting groups. Reaction of compound H_6-5 with [Ti(OPr) _4] in the presence of (NEt_4)Cl leads to the formation of complex (NEt_4)_2[Ti(5)] featuring three bidentate benzene-o-dithiolato donors from one ligand coordinated to the metal center. An X-ray diffraction structure analysis with crystals of (NEt_4) _2[Ti(5)]·DMF has shown that the coordination geometry at the metal center is best described as distorted trigonal-prismatic with a twist angle of φ_(av) = 18:5°.