resumo
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.
palavras-chave
CAMBRIDGE STRUCTURAL DATABASE; CRYSTAL-STRUCTURE; OXO COMPLEXES; MAIN-GROUP; ORGANOMETALLIC OXIDES; ALCOHOL OXIDATION; METAL-COMPLEXES; PERRHENATE; CHEMISTRY; LIGANDS
categoria
Chemistry
autores
Goncalves, IS; Lopes, AD; Amarante, TR; Paz, FAA; Silva, NJO; Pillinger, M; Gago, S; Palacio, F; Kuhn, FE; Romao, CC
nossos autores
Filipe Alexandre Almeida Paz
Investigador Principal
Isabel Maria de Sousa Gonçalves
Professor associado
Martyn Pillinger
Investigador Principal
Nuno João Silva
Investigador Principalagradecimentos
We are grateful to the Fundacao para a Ciencia e a Tecnologia (FCT, Portugal), POCI 2010, OE and FEDER (Project PTDC/QUI/71198/2006) for financial support, and for specific funding towards the purchase of the single-crystal diffractometer. The work in Zaragoza was supported by the research grants MAT2007-61621 and CONSOLIDER-INGENIO 2010 Programme, grant CSD2007/0010 from the Ministry of Education. T. R. A. and S. G. thank the FCT for grants. N. J. O. S. acknowledges CSIC for an I3P contract and Ciencia2008 for a post-doctoral position.