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Unusual phenomenon in the chemistry of orthometalated ruthenium (II) complexes |
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| Authors: | Alexander D Ryabov Hebert Estevez Michel Pfeffer |
| Institution: | a Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, United States b Instituto de Química, UNAM, Circuito Exterior s/n, Ciudad Universitaria, Mexico, DF 04510, Mexico c Instituto de Investigaciones en Materiales, UNAM, Circuito Exterior s/n, Ciudad Universitaria, DF 04510, Mexico d Laboratoire de Synthèses Métallo-Induites, UMR CNRS 7513 Université Louis Pasteur 4, rue Blaise Pascal 67070 Strasbourg, France |
| Abstract: | Yellow cyclometalatated ruthenium (II) complexes Ru(o-X-2-py)(MeCN)4]PF6 (1, X = C6H4 (a) or 4-MeC6H3 (b)) react readily with 1,10-phenanthroline (LL) in MeCN to give brownish-red species cis-Ru(o-X-2-py)(LL)(MeCN)2]PF6 in high yields. The same reaction of the same complexes under the same conditions with 2,2′-bipyridine results in a significant color change from yellow to brownish-orange suggesting a formation of new species. Surprisingly, X-ray structural studies of these two complexes showed that they are structurally indistinguishable from the starting complexes 1. Referred to as complexes 4a,b, the new compounds are slightly more stable in the air though their spectral characteristics in solution are similar to 1a,b. The diffuse reflectance spectroscopy is so far the only technique that indicated differences between 1 and 4. |
| Keywords: | Ruthenium Cyclometalated compounds X-ray crystallography Isomerism |
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