Structural variety in nitrate complexes of the heavy lanthanides with 2,2 ': 6 ',2 ''-terpyridine, and stereoselective replacement of nitrate

Reference:

Ahrens, B., Cotton, S. A., Feeder, N., Noy, O. E., Raithby, P. R. and Teat, S. J., 2002. Structural variety in nitrate complexes of the heavy lanthanides with 2,2 ': 6 ',2 ''-terpyridine, and stereoselective replacement of nitrate. Journal of the Chemical Society: Dalton Transactions

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Abstract

Structural studies show that the solvolysis of a nitrate group in the heavy lanthanide complexes [Ln(terpy)(NO3)(3)] {Ln = Yb, Lu; terpy = 2,2': 6', 2"-terpyridine} is stereoselective. In the complexes [Ln(terpy)(NO3)(3)(EtOH)], the `equatorial nitrate group', which lies in the same plane as the terpy ligand, coordinates in a monodentate fashion and the vacant coordination site is filled by an ethanol molecule. Similarly, in the unusual complexes [Yb(terpy)(NO3)(2)(H2O)(2)][NO3] and [Lu(terpy)(NO3)(2)(H2O)( EtOH)][NO3], two water molecules or a water and an ethanol molecule are bound to the metal in preference to the nitrate and lie in the same plane as the terpy ligand.

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