Acta Cryst. (2004). E60, o2452-o2454  [ doi:10.1107/S1600536804030594 ]

A sterically constrained bis(2,2':6',2''-terpyridine) ligand

A. C. Benniston, W. Clegg, R. W. Harrington and P. Li

Abstract: The title compound, 4,4'-bis[(2,2':6',2''-terpyridin-4-yl)ethynyl]-2,2'-(3,6,9-trioxaundecane-1,11-diyldioxy)-1,1'-biphenylethyl acetate solvate, C₅₄H₄₂N₆O₅·C₄H₈O₂, is a sterically constrained ligand based on the well-known chelator 2,2':6',2''-terpyridine (terpy). Two terpy units are linked by ethynyl bridges to a central 2,2'-biphenyl unit, in which the two rings are connected by a polyether strand. The torsion angle between the two rings of the biphenyl unit is 113.25 (17)°. The crown ether ring is flexible and capable of complexing metal cations, and the two terpy units may be reorganized from their observed trans-trans configuration to act as terdentate ligands for transition metal ions.

Online 27 November 2004

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