Complexes of the imine/thioether mixed-donor ligand 8-methylthioquinoline with d6-configurated transition metal centers: Synthesis, structures and comparison with complexes of 1-methyl-2-(methylthiomethyl)-1H-benzimidazole

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Inorganica Chimica Acta, 357 (11): 3325--3330 (2004)
DOI: 10.1016/j.ica.2004.03.040


Coordination compds. of chelating 8-methylthioquinoline (MTQ) with the complex fragments ReI(CO)3Cl, RuII(bpy)22+, RhIII(C5Me5)Cl+, IrIII(C5Me5)Cl+, and PtIVMe4 were synthesized and structurally characterized. Whereas the ruthenium(II) complex displays the strongest preference of bonding to N vs. S, (MTQ)PtMe4 shows the most balanced metal-donor bonding within the chelate ring due to a relatively short bond to S (2.319 \AA) vs. N (2.150 \AA). Fac-(MTQ)Re(CO)3Cl exhibits a particularly long metal-sulfur bond at 2.472 \AA. Cyclic voltammetry of (MTQ)Ru(bpy)2(PF6)2 reveals one reversible oxidn. to RuIII and three closely spaced redn. waves for the coordinated ligands. In comparison with the imine/thioether chelate ligand 1-methyl-2-(methylthiomethyl)-1H-benzimidazole (mmb) the MTQ ligand with its more rigid chelate setting N(sp2)-C(sp2)-C(sp2)-S forms generally shorter M-S bonds and displays stronger p acceptor behavior. on SciFinder(R)



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