title: Hydrogen-bonded pillars of alternating chiral complex cations and anions: 1. Synthesis, characterization, X-ray structure and thermal stability of catena-{[Co(H(2)oxado)(3)][Cr(C(2)O(4))(3)].5H(2)O} and of its precursor (H(3)oxado)[Co(H(2)oxado)(3)](SO(4))(2).2H(2)O.
abstract: Compound (H(3)oxado)[Co(H(2)oxado)(3)](SO(4))(2).2H(2)O () (H(3)oxado(+) = oxamide dioximemonoximium) reacted metathetically with Ba(6)(H(2)O)(17)[Cr(C(2)O(4))(3)](4).7H(2)O in water to give the one-dimensional complex salt {[Co(H(2)oxado)(3)][Cr(C(2)O(4))(3)].5H(2)O}(infinity) () (H(2)oxado = oxamide dioxime). Compounds and were characterized by elemental analysis, FTIR, UV-Vis and by single crystal X-ray structure determination. The structure of consists of infinite pillars of alternating chiral complex cations and anions linked together along [100] by electrostatic and longitudinal O-HO interactions, with an average intrachain CoCr separation of 4.94 A. Equatorial N-HO bridges cross-link neighboring pillars (which are of opposite chirality) and consolidate a three-dimensional lattice framework which delineates elliptic nanochannels parallel to the a axis, encapsulating highly disordered water molecules. The thermal stability of both compounds was assessed by TGA, and the effective magnetic moment of , checked at room temperature, revealed considerable spin-orbit coupling.
authors.affiliation: Department of Inorganic Chemistry, Faculty of Science, P.O. Box 812, University of Yaounde I, Yaounde, Cameroon. belombe2000@yahoo.fr
authors.forename: M M
authors.initials: MM
authors.lastname: Bélombé
authors.forename: J
authors.initials: J
authors.lastname: Nenwa
authors.forename: Y A
authors.initials: YA
authors.lastname: Mbiangué
authors.forename: F
authors.initials: F
authors.lastname: Majoumo-Mbé
authors.forename: P
authors.initials: P
authors.lastname: Lönnecke
authors.forename: E
authors.initials: E
authors.lastname: Hey-Hawkins