Abstract
The reaction of 2,3-bis (2,2′-bipyridyl) quinoxaline (L) with ruthenium terpyridine (tpy) trichloride in ethanol containing N-ethyl- morpholine afforded [LRu (tpy) , PF 6] 2 (1) and the η 5- μ-chloro complex [LRu (Cl) tpy, PF 6] (2) , as major and minor products, respectively, and recovered L. The structure of 1 was confirmed by 1H NMR spectroscopic and X-ray crystallographic studies, and compared to that of L. The precise structure of 2 was distinguished between several possible isomers through a combination of 1H NMR and UV⧸vis spectroscopy. Together, all of these studies suggest that steric interactions between the quinoxaline fragment and the orthogonal tpy ring system, rather than between the bipyridyl groups of L, are responsible for the formation of 2.
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