title: Heterometallic complexes involving iron(II) and rhenium(VII) centers connected by mu-oxido bridges.
abstract: The reaction of FeI(2) with two equivalents of AgReO(4) in acetonitrile leads to yellow, crystalline Fe(ReO(4))(2)(CH(3)CN)(3) (1), and the treatment of 1 with four equivalents of CpFe(CO)(2)CN gives orange, crystalline Fe(ReO(4))(2)[CpFe(CO)(2)(CN)](4) (2). Compound 2 can also be prepared in one step by the reaction of FeI(2), AgReO(4) and CpFe(CO)(2)CN in dichloromethane. The structure of 1 consists of infinite chains in which alternating {Fe(CH(3)CN)(4)} and {Fe(ReO(4))(2)(CH(3)CN)(2)} units are linked by perrhenate anions to form a (-ReO(2)-O-Fe(ReO(4))(2)(CH(3)CN)(2)-O-ReO(2)-O-Fe(CH(3)CN)(4)-O-)(n) molecular wire. The structure of 2 shows a monomeric iron complex with a slightly distorted octahedral coordination environment consisting of four organometallic complexes coordinated in the equatorial plane via the cyanide groups and two monodentate perrhenates in the corresponding apical positions. Both compounds were further characterised in the solid state by IR spectroscopy, thermogravimetric analysis and magnetic susceptibility measurements. The magnetic data indicate that 1 behaves as a ferrimagnetic chain with 3D ordering below 8 K due to inter-chain interactions. Compound 2 has antiferromagnetic interactions within the Fe(ReO(4))(2)[CpFe(CO)(2)(CN)](4) clusters.
authors.affiliation: Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal. igoncalves@ua.pt
authors.forename: Isabel S
authors.initials: IS
authors.lastname: Gonçalves
authors.forename: André D
authors.initials: AD
authors.lastname: Lopes
authors.forename: Tatiana R
authors.initials: TR
authors.lastname: Amarante
authors.forename: Filipe A
authors.initials: FA
authors.lastname: Almeida Paz
authors.forename: Nuno J O
authors.initials: NJ
authors.lastname: Silva
authors.forename: Martyn
authors.initials: M
authors.lastname: Pillinger
authors.forename: Sandra
authors.initials: S
authors.lastname: Gago
authors.forename: Fernando
authors.initials: F
authors.lastname: Palacio
authors.forename: Fritz E
authors.initials: FE
authors.lastname: Kühn
authors.forename: Carlos C
authors.initials: CC
authors.lastname: Romão