title: Synthesis, structure, and complexation of a large 28-mer macrocycle containing two binding sites for either anions or metal ions.
abstract: The "one-pot" synthesis and characterization of a large 28-mer macrocycle (H(4)L(2)) with oxamido units capable of complexing guest ions through oxygen or nitrogen donor atoms is reported. Single-crystal structure determination of H(8)L(2)(NO(3))(4) and (Cu(2)[H(2)L(2)](H(2)O)(2))(NO(3))(2) demonstrated that the macrocycle contains two sites capable of complexing two nitrate anions or two copper(II) ions, involving a large structural reorganization in the conformation of the macrocyclic framework on coordination of the copper(II) ions when compared to the nitrate. Electrochemical and magnetic susceptibility measurements on the dinuclear Cu(II) complex and the related mononuclear and trinuclear Cu(II) complexes derived from the related 14-mer macrocycle were carried out and illustrate the role of the oxamido groups in mediating metal-metal interaction and delocalization.
authors.affiliation: Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, UK.
authors.forename: Leroy
authors.initials: L
authors.lastname: Cronin
authors.forename: Pamela A
authors.initials: PA
authors.lastname: McGregor
authors.forename: Simon
authors.initials: S
authors.lastname: Parsons
authors.forename: Simon
authors.initials: S
authors.lastname: Teat
authors.forename: Robert O
authors.initials: RO
authors.lastname: Gould
authors.forename: Vivienne A
authors.initials: VA
authors.lastname: White
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Long
authors.forename: Neil
authors.initials: N
authors.lastname: Robertson