Charge alone is not sufficient to cause helication with 2,2′ : 6′,6″ : 6″,2‴ : 6‴,2â —-quinquepyridine; crystal and molecular structure of 2,2′ : 6′,6″ : 6″,2‴ : 6‴,2â —-quinquepyridinium bishexafluorophosphate
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 3,p. 229-231
- https://doi.org/10.1039/c39920000229
Abstract
2,2′ : 6′,2″ : 6″,2:6,2â�—-Quinquepyridine (qpy) forms a shallow monohelical (1 : 1) complex with silver(I), but double-helical (2 : 2) complexes with first-row transition-metal ions, and the crystal structure of [H2qpy][PF6]2 reveals that the cation is near-planar rather than helical, and adopts a cis,trans,trans,cis conformation about the interannular C–C bonds [P21la, a= 12.489(4), b= 17.308(7), c= 12.597(3)Å, β= 93.92(2)°]; the features leading to a helication are discussed.Keywords
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