Heterometallic complexes involving iron(II) and rhenium(VII) centers connected by mu-oxido bridges

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Abstract

The reaction of FeI2 with two equivalents of AgReO4 in acetonitrile leads to yellow, crystalline Fe(ReO4)(2)(CH3CN)(3) (1), and the treatment of 1 with four equivalents of CpFe(CO)(2)CN gives orange, crystalline Fe(ReO4)(2)[CpFe(CO)(2)(CN)](4) (2). Compound 2 can also be prepared in one step by the reaction of FeI2, AgReO4 and CpFe(CO)(2)CN in dichloromethane. The structure of 1 consists of infinite chains in which alternating {Fe(CH3CN)(4)} and {Fe(ReO4)(2)(CH3CN)(2)} units are linked by perrhenate anions to form a (-ReO2-O-Fe(ReO4)(2)(CH3CN)(2)-O-ReO2-O-Fe(CH3CN)(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(ReO4)(2)[CpFe(CO)(2)(CN)](4) clusters.
Original languageUnknown
Pages (from-to)10199-10207
JournalDalton Transactions
Volume46
Issue numberNA
DOIs
Publication statusPublished - 1 Jan 2009

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