Deacon, Glen B., Junk, Peter C., and Moxey, Graeme J. (2009) Metal-pi interactions dominate in the solid-state structures of molecular heterobimetallic alkali-metal-europium(II) aryloxo complexes. Chemistry: an Asian journal, 4 (8). pp. 1309-1317.

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Abstract

Treatment of Eu metal, 2,6-diphenylphenol (HOdpp), and MOdpp (M = Na, K) at elevated temperature in the presence of mercury afforded heterobimetallic complexes which were structurally characterized after crystallization from toluene. The structures of [MEu(Odpp)(3)]center dot nPhMe (M=Na, n = 11; K, n = 2.5, 2) consist solely of bridging aryloxide ligands and feature extensive pi-Ph-metal interactions. Rather than a heterobimetallic species, treatment of Eu metal and HOdpp with LiOdpp under similar conditions afforded a number of products, including a mixed-valent europium complex, [Eu(2)(OdPP)(3)][Eu(Odpp)(4)]center dot 4PhMe (3). The structural framework of the [Eu(2) (Odpp)(3)](+) cation of 3 is similar to that of the molecular lieterobimetallics 1 and 2, including the presence of pi-Ph-Eu interactions. The reluctance of the reaction to provide a Eu/Li heterobimetallic complex was exemplified by the simultaneous crystallization of [Eu(2) (Odpp)(4)]center dot PhMe (6) and the homoleptic cubane [Li(4)(Odpp)(4)]center dot 2C(6)H(14) (5) from toluene/hexane.

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