title: Discrete Mixed-Valence Metal Chains: Iridium Pyridonate Blues The generous financial support from DGES and MCyT-PNI (Projects PB98-641 and BQU2000-1170) is gratefully acknowledged.
authors.affiliation: Departamento de Química Inorgánica Instituto de Ciencia de Materiales de Aragón Universidad de Zaragoza-C.S.I.C., 50009-Zaragoza (Spain).
authors.forename: Cristina
authors.initials: C
authors.lastname: Tejel
authors.forename: Miguel A.
authors.initials: MA
authors.lastname: Ciriano
authors.forename: B. Eva
authors.initials: BE
authors.lastname: Villarroya
authors.forename: Raquel
authors.initials: R
authors.lastname: Gelpi
authors.forename: José A.
authors.initials: JA
authors.lastname: López
authors.forename: Fernando J.
authors.initials: FJ
authors.lastname: Lahoz
authors.forename: Luis A.
authors.initials: LA
authors.lastname: Oro