title: Dinuclear complexes of a pseudocalixarene macrocycle: structural consequences of intramolecular hydrogen bonding.
abstract: A series of dinuclear complexes of a pseudocalixarene macrocycle H6L containing two 2,2'-methylenediphenol groups have been synthesised and structurally characterised. Using divalent metal ions, complexes containing a common hyperbolic paraboloid (saddle) M2(H4L)2+ core are formed. The structure is controlled by two strong O-H-O interactions resulting from metal ion-promoted monodeprotonation of the methylenediphenol units. The metal ions are located in a cleft within which neutral or anionic guests can bind. Use of trivalent metal ions leads to complete deprotonation of the phenol groups and loss of the saddle conformation.
authors.affiliation: Chemistry Department, Loughborough University, Loughborough, UK LE11 3TU.
authors.forename: Julia Barreira
authors.initials: JB
authors.lastname: Fontecha
authors.forename: Sandrine
authors.initials: S
authors.lastname: Goetz
authors.forename: Vickie
authors.initials: V
authors.lastname: McKee