Farrell, David; Harding, Charles J.; McKee, Vickie and Nelson, Jane
Effect of methylation on the coordination of copper by small azacryptands; the role of geometrically constrained hydrogen bonding in stabilizing terminally coordinated oxygen species.
Dalton Transactions, 2006(26) pp. 3204–3211.
Treatment of N-methyl substituted aminocryptand hosts with copper(II) generates monocopper(II)
cryptates where copper(II) coordinates an oxygen-centered species, formally H3O+, which is also
strongly hydrogen bonded to three aminocryptand N-methyl atoms via bonds which may best be
viewed as NHd+ · · ·Od− in consequence of charge transfer. The strength of this hydrogen bonding
precludes successful competition of another copper ion for the second coordination site thus
suppressing formation of any Cu–Cu bonded average-valent system.
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