title: trans-Cyano(6-methyl-1,4,8,11-tetraazacyclotetradecan-6-amine)cobalt(III) bis(perchlorate) hydrate and trans-hydroxo(6-methyl-1,4,8,11-tetraazacyclotetradecan-6-amine)cobalt(III) bis(perchlorate).
abstract: The crystal structures of a pair of closely related macrocyclic cyano- and hydroxopentaaminecobalt(III) complexes, as their perchlorate salts, are reported. Although the two complexes, [Co(CN)(C(11)H(27)N(5))](ClO(4))(2).H(2)O and [Co(OH)(C(11)H(27)N(5))](ClO(4))(2), exhibit similar conformations, significant differences in the Co-N bond lengths arise from the influence of the sixth ligand (cyano as opposed to hydroxo). The ensuing hydrogen-bonding patterns are also distinctly different. Disorder in the perchlorate anions was clearly resolved and this was rationalized on the basis of distinct hydrogen-bonding motifs involving the anion O atoms and the N-H and O-H donors.
authors.affiliation: Department of Chemistry, The University of Queensland, Brisbane, Queensland 4072, Australia. p.bernhardt@uq.edu.au
authors.forename: Paul V
authors.initials: PV
authors.lastname: Bernhardt
authors.forename: Brendan P
authors.initials: BP
authors.lastname: Macpherson