X-ray and spectroscopic characterisation of novel mono- and trinuclear Fe(0) complexes derived from 1-dimethylhydrazono-4-phenylbuten-3-ones

• Published in: Polyhedron 2001, Vol.20 (3), p.215-222
• Main Authors: Alvarez-Toledano, C., Gutiérrez-Pérez, R., Toscano, R.A., Moya-Cabrera, M., Haquet, T., Ortega, M.C., Cabrera, A.
• Format: Article
• Language: English
• Subjects: Mono- and trinuclear complexes; Monohydrazones derivatives
• ISSN: 0277-5387
• DOI: 10.1016/S0277-5387(00)00607-0

The reaction between α,β-unsaturated derivatives of monohydrazones of 1,2-dicarbonylic compounds (namely the 1-dimethylhydrazono-4-phenylbuten-3-ones ( 1a– c)) and di-iron nonacarbonyl affords the novel mono- and trinuclear Fe (0) complexes 2b– c and 3a– c, respectively, with a σ-N and an η 2-coordination upon the CC bond of the α,β-unsaturated system for the former compounds, which actually generate six-membered metallocycles. With the latter complexes 3a– c, the main structural features are the unexpected presence of a dinuclear iron unit displaying at one end both the σ-N and σ-O coordination and at the other an η 2-coordination upon the CN double bond giving rise to an unique organometallic arrangement in the heteroatom-containing moiety and, in addition, an η 2-coordination of another Fe(CO) 4 fragment upon the CC bond of the α,β-unsaturated system also results. The complexes were characterised by spectroscopic methods (IR, MS, 1H and 13C NMR) and their structures were confirmed by single-crystal X-ray analysis.