title: (C-rac-5,5,7,12,12,14-Hexamethyl-1,4,8,11-tetraazacyclotetradecane-kappa4N)(nicotinato-O,O')nickel(II) perchlorate.
abstract: In the title compound, [Ni(C(6)H(4)NO(2))(C(16)H(36)N(4))]ClO(4), the macrocyclic unit adopts a folded conformation, allowing the two carboxyl O atoms to occupy two neighbouring coordination sites and thus form an additional four-membered chelate ring. The less crowded side of the macrocycle (that with the two asymmetric C-H groups) is directed towards the nicotinate anion and the asymmetric C-CH(3) groups are directed away from it. The macrocyclic NH groups neighbouring the C-CH(3) groups are also directed away from the nicotinate anion, while those NH groups which are near to the geminal methyl groups are directed towards the nicotinate anion. Although the complex does not include water molecules, three types of hydrogen bond were found, involving NH groups of the macrocyclic ligand, pyridine N atoms and O atoms of the perchlorate anions.
authors.affiliation: Centro de Instrumentos, Universidad Nacional Autónoma de México, Circuito Exterior CU, 04510 México DF, Mexico. elenagd@servidor.unam.mx
authors.forename: E V
authors.initials: EV
authors.lastname: Basiuk
authors.forename: V A
authors.initials: VA
authors.lastname: Basiuk
authors.forename: S
authors.initials: S
authors.lastname: Hernández-Ortega
authors.forename: M
authors.initials: M
authors.lastname: Martínez-García
authors.forename: J M
authors.initials: JM
authors.lastname: Saniger-Blesa