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Surface‐Assisted Synthesis and Behavior of Dimetallic Mixed‐Metal Complexes [M 2 Cl 2 (μ‐Cl) 4 (CO) 6 M′(L) 2 ] (M = Ru, Os; M′ = Fe, Co; L = CH 3 CH 2 OH, H 2 O)
Author(s) -
Jakonen Minna,
Hirva Pipsa,
Nivajärvi Taina,
Kallinen Mirja,
Haukka Matti
Publication year - 2007
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200700341
Subject(s) - chemistry , cobalt , carbon monoxide , osmium , ruthenium , metal , ionic bonding , carbonylation , inorganic chemistry , ligand (biochemistry) , catalysis , ion , organic chemistry , biochemistry , receptor
Abstract The reductive carbonylation of ruthenium and osmium halides in the presence of cobalt and iron surfaces was studied. In these surface‐assisted reactions the metal surface plays an active role in releasing metal ions, which can be used for the in situ synthesis of mixed‐metal compounds. A linear, dimetallic, chlorido‐bridged, trinuclear complex [Ru 2 Cl 2 (μ‐Cl) 4 (CO) 6 Co(CH 3 CH 2 OH) 2 ] was obtained by the interaction between reducing RuCl 3 and the cobalt surface. In the reaction the RuCl 3 is reduced with carbon monoxide in the presence of a solid cobalt surface in ethanol solution. During the reduction of the RuCl 3 the cobalt surface was simultaneously corroded, releasing cobalt cations. In addition to [Ru 2 Cl 2 (μ‐Cl) 4 (CO) 6 Co(CH 3 CH 2 OH) 2 ], the reaction also produced other trinuclear complexes and mononuclear products, such as a bent and linear dimetallic, chlorido‐bridged complex with the aqua ligand [Ru 2 Cl 2 (μ‐Cl) 4 (CO) 6 Co(H 2 O) 2 ] and ionic [RuCl 3 (CO) 3 ] 2 [Co(H 2 O) 6 ]. The carbon monoxide reduction of RuI 3 produced the ionic complex [RuI 3 (CO) 3 ] 2 [M′(H 2 O) 6 ] (M′ = Fe, Co) in the presence of iron, stainless steel or cobalt. Iodido‐bridged trinuclear mixed‐metal complexes were not observed. The surface‐assisted process proved to be useful with other metal combinations as well. When RuCl 3 was replaced with OsCl 3 , a variety of trinuclear mixed‐metal complexes, such as [Os 2 Cl 2 (μ‐Cl) 4 (CO) 6 Co(CH 3 CH 2 OH) 2 ] and ionic [OsCl 3 (CO) 3 ] 2 [M(H 2 O) 6 ] (M = Fe, Co), were obtained, depending on the metal surface used. Due the lability of the chlorido‐bridged trinuclear complexes, the possible decomposition steps of [M 2 Cl 2 (μ‐Cl) 4 (CO) 6 M′(CH 3 CH 2 OH) 2 ] (M = Ru, Os; M′ = CO, Fe) were studied computationally, using DFT methods. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)