Synthesis and spectroscopic characterization of heterobimetallic (α-alkynyl)iron-cobalt hexacarbonyl complexes, μ-(1-σ, 2-3, η2-R2C-CCR′)][(CO)3Fe-Co(CO)3] and [μ-(1-σ, 2-3, η2-H2C-CCCH2OH)] [(CO)3Fe-Co(CO)2(PPh3)]
1983; Elsevier BV; Volume: 2; Issue: 2 Linguagem: Inglês
10.1016/s0277-5387(00)84676-8
ISSN1873-3719
AutoresSilvio Aime, Domenico Osella, Luciano Milone, António Tiripicchio,
Tópico(s)Carbon dioxide utilization in catalysis
ResumoThe title compounds have been prepared from reactions of Co2(CO)6(μ-HOR2CC2R′) or Co2(CO)6(μ-HOR2CC2CR2OH) complexes with Fe(CO)5 in acetone. In the latter set of reactions the homobimetallic butatriene compounds, Fe2(CO)6-(μ-R2CCCCR2), are also obtained. The striking feature of these reactions is the ability of Fe(CO)5 to dehydroxylate the organic moiety and to replace a Co(CO)3 unit forming mixed iron-cobalt derivatives. A direct interaction between the iron and the carbon atom, originally bearing the lost -OH group, is evident from the bulk of the spectroscopic data; thus the organic chain acts as an overall 5 electron donor, according to the E.A.N. formalism. The heterobimetallic compounds have been characterized by elemental analysis, mass spectrometry, IR spectroscopy and NMR studies. For the phosphine derivative FeCo(CO)5(PPh3)(H2CC2OH) a crudely refined X-ray analysis has been performed.
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