title: Tetra-kis(μ(2)-ferrocene-carboxyl-ato-κO:O')bis-[(methanol-κO)copper(II)] methanol disolvate.
abstract: The complex mol-ecule of the title compound, [Cu(2)Fe(4)(C(5)H(5))(4)(C(6)H(4)O(2))(4)(CH(3)OH)(2)]·2CH(3)OH, lies about an inversion centre and contains two centrosymetrically related Cu(II) atoms bridged by four O:O'-bidentante ferrocene-carboxyl-ate anions, leading to a dimeric tetra-bridged unit with a paddle-wheel geometry. The Cu(II) atom has a distorted square-pyramidal coordination environment with four O atoms from four ferrocene-carboxyl-ate ligands in basal positions and an O atom from a methanol mol-ecule in an apical position. One of the two crystallographically independent ferrocenyl groups has a staggered conformation, while the other is eclipsed. The mol-ecules are connected into a chain along the b axis by O-H⋯O hydrogen bonds involving coordinated and uncoordinated methanol mol-ecules and the O atom from a ferrocene-carboxyl-ate unit.
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad de País Vasco (UPV/EHU), PO Box 644, E-48080 Bilbao,  Spain.
authors.forename: Beñat
authors.initials: B
authors.lastname: Artetxe
authors.forename: Pablo
authors.initials: P
authors.lastname: Vitoria
authors.forename: Aroa
authors.initials: A
authors.lastname: Pache
authors.forename: Santiago
authors.initials: S
authors.lastname: Reinoso
authors.forename: Juan M
authors.initials: JM
authors.lastname: Gutiérrez-Zorrilla