Synthesis and exploratory coordination chemistry of the new ditertiary carbinamine ligand 2,6-bis(α-aminoisopropyl)pyridine
作者:Lutz Dahlenburg、Harald Treffert、Jörg Dannhäuser、Frank W. Heinemann
DOI:10.1016/j.ica.2006.08.025
日期:2007.4
The new pyridine-based N boolean AND N boolean AND N tridentate ligand 2,6-C5H3N(CMe2NH2)(2) (1) was synthesized by the treatment of 2,6-pyridinedicarbonitrile with an excess of the organocerium reagent in situ generated from CeCl3 and methyllithium in THF. The reaction of 1 with [RuCl2(PPh3)(3)] in THF at ambient conditions afforded (OC-6-23)-[RuCl2,6-C5H3N(CMeNH2)(2)}(PPh3)(2)]Cl (2). The corresponding dimethyl sulfoxide complex [RuCl2,6-C5H3N(CMe2NH2)(2)} S(O)Me-2}(2)]Cl (3) was isolated as a mixture of the (OC-6-23) and (OC-632) stercoisonters 3a and 3b from the reaction between 1 and (OC-6-22)-[RuCl2 S(O)Me-2}(3)(OSMe2)] in toluene at 80 degrees C. A prolonged interaction in toluene at reflux temperature gave isomerically pure 3a. The metal trichloride hydrates MCl3 - xH(2)O (M = Ru, Rh, Ir; x congruent to 2-4) produced mer-[RuCl32,6-C5H3N(CMe2NH2)(2)}] (M = Ru: 4; Rh: 5; Ir: 6), when combined with I in refluxing ethanol. The crystal structures of the following compounds were determined: ligand 1 and complexes 2 5 as addition compounds 2 - CH2Cl2, 3a (.) C7H8, ;4 (.) EtOH and 5 (.) 2(1)/2DMF. (c) 2006 Elsevier B.V. All rights reserved.