Reactivity of [(η6-arene)RuCl(μ-Cl)2] towards some potentially bidentate ligands. Molecular structure of [(η6-p-cymene)RuCl(taz)]PF6 (p-cymene = p-MeC6H4CH-Me2; taz = 2,6-dimethyl-5-oxo-3-thioxo-2,3,4,5-tetrahydro-1,2,4-triazine)
作者:Gabriel García、Isabel Solano、Gregorio Sánchez、María D. Santana、Gregorio López、Jaume Casabó、Elíes Molins、Carles Miravitlles
DOI:10.1016/0022-328x(94)88016-6
日期:1994.3
Reactions of [(eta6-arene)RuCl(mu-Cl)}2] [arene = benzene or p-cymene (p-isopropyltoluene)] have been carried out with 4-cyanopyridine (4-CNpy), o-aminophenol (oap), o-phenylenediamine (opda), p-phenylenediamine (ppda) and 2,6-dimethyl-5-oxo-3-thioxo-2,3,4,5-tetrahydro-1,2,4-triazine (taz). The isolated complexes are of the types [(eta6-C6H6)RuCl2L] [L = 4-CNpy (Ia) or oap (IIa)]. [(eta6-C6H6)RuClL2]Cl [L = oap (IIIa); L2 (bidentate) = opda (IVa) or taz (VIa)] or [(eta6-C6H6)Cl2Ru}2mu-ppda)] (VIIIa). Complexes IVa and VIa undergo anion exchange with KPF6 to give the corresponding hexafluorophosphates (Va and Vlla). The p-cymene analogues (Ib-VIIIb) have been obtained. Conductance measurements, thermogravimetry and spectroscopic (IR and H-1 and C-13 NMR) methods have been used to study the new compounds. The structure of VIIb was determined by X-ray diffraction methods. The ruthenium atom of the cation of VIIb is coordinated by the 4-amino (Ru-N = 2.14O(2) angstrom) and 3-thioxo (Ru-S = 2.354(1) angstrom) groups of the triazine and a chloride ligand (Ru-Cl = 2.394(1) angstrom). The eta6-p-cymene ring completes the hexacoordination.