Triflate anion and ligand influences in silver(i) coordination polymers of four isomeric dipyridyl ketone oximes?

CrystEngComm Pub Date: 2012-10-15 DOI: 10.1039/C2CE26449H

Abstract

The synthesis and X-ray characterisation of four isomeric dipyridyl ketone oxime ligands, 4,4′-dipyridyl ketone oxime, L44, 3,3′-dipyridyl ketone oxime, L33, 2,4-dipyridyl ketone oxime, L24 and 2,3-dipyridyl ketone oxime, L23 is described. X-ray structural characterisation of the precursor ketones 3,3′-dipyridyl ketone, L1, and 2,4-dipyridyl ketone, L2, is also reported for comparison. Four AgCF3SO3 complexes of the dipyridyl ketone oxime ligands were prepared and structurally characterised, [Ag(L44)2](CF3SO3), 1, {[AgL33](CF3SO3)}∞, 2, [AgL24(CF3SO3)]∞, 3, and [Ag2L23(CF3SO3)2]∞, 4. The structural role of the CF3SO3? anion in the formation of Ag(I) coordination polymer networks, together with the effect of the varying pyridyl substitution patterns of L44, L33, L24 and L23 was investigated. In 1 the CF3SO3? anion was unbound and disordered. It was encapsulated in the channels of a honeycomb 3D H-bonded structure. In 2 the CF3SO3? anion remained unbound, being encapsulated within the centre of a helical polymer chain. In 3 the CF3SO3? anion was weakly bound to the Ag(I) ion and as such decorated the side of a bowed 1-D chain. The two different CF3SO3? anions in 4 adopted a range of binding modes from monodentate, bis-monodentate to tris-monodentate with the Ag(I) ions and gave rise to the formation of an unusual CF3SO3? bridged 2-D network.

Graphical abstract: Triflate anion and ligand influences in silver(i) coordination polymers of four isomeric dipyridyl ketone oximes
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