68185-46-6Relevant academic research and scientific papers
Basic Cluster Reactions: Opening and Partial Fragmentation of Tetranuclear Clusters by CO
Richter, Felix,Mueller, Manfred,Gaertner, Nicole,Vahrenkamp, Heinrich
, p. 2438 - 2451 (2007/10/02)
The influence of CO on 16 mixed tetranuclear clusters of the general type M4(μ3-E)(μ2-AsMe2) with M = Co, Fe, Ru, Mo, W, and E = S, PR, CR is reported.In all cases fragmentation with formation of trinuclear clusters occurs at slightly elevated pressures, during which a Co-As unit is normally eliminated.At normal pressure intermediates are observed in 7 cases, 4 of which can be isolated.Crystal structure analysis of the intermediate FeCo2SAsMe2Cp(CO)10 (8a) has shown that two metal-metal bonds are opened upon addition of CO with formation of the new EM3(μ-AsM) cluster framework.Under vacuum the intermediates are reconverted to the starting clusters with elimination of CO.
Cluster Construction: Synthesis of Tetranuclear Clusters via Aggregation
Richter, Felix,Beurich, Harald,Mueller, Manfred,Gaertner, Nicole,Vahrenkamp, Heinrich
, p. 3774 - 3793 (2007/10/02)
Trinuclear clusters with EM3 frameworks (1 - 3, EM3 = SFeCo2, SRuCo2, PFeCo2, CCo3) can be connected via CO substitution with AsM'units (M'= Cr, Mo, W).The EM3 - AsM' intermediates 7 - 10 eliminate CO under appropriate conditions to form clusters 13 - 16 with tetrahedral M3M' frameworks which bear μ3-E and μ2-AsMe2 ligands.The combinations M3M'= FeCo2Mo, FeCo2W, RuCo2Mo, RuCo2W, Co3Mo, and Co3W were realized.Starting from trinuclear clusters 4, 5 with the chiral frameworks EM3 = SFeCoMo, SFeCoW, SRuCoMo, and SRuCoW by the same procedure via 11, 12 tetranuclear clusters 17, 18 with the frameworks M3M'= FeCoMo2, FeCoW2, FeCoMoW, RuCoMo2, RuCoW2, and RuCoMoW are obtained.Among these are the first two clusters with four different metal atoms.The crystal structures of FeCo2MoS(AsMe2)Cp(CO)8 (13a), RuCo2MoS(AsMe2)Cp(CO)8 (14a), and FeCoMoWS(AsMe2)Cp2(CO)7 (17b) were determined.The tetranuclear clusters show ligand fluxionality as shown by dynamic 1H NMR spectroscopy.
