84280-79-5Relevant academic research and scientific papers
Triangular iron-silver clusters via the addition of silver electrophiles to electron-rich iron-iron bonds
Mott, Graham N.,Taylor, Nicholas J.,Carty, Arthur J.
, p. 447 - 452 (2008/10/08)
The synthesis of triangular iron-silver clusters [Fe2Ag(CO)6{CHC(C6H5)(NRR 1)}P(C6H5)2]X, 2 (R = H, R1 = CH3, C2H5, CH(CH3)2, c-C6H11; R = R1 = C2H5; X = ClO4 or PF6), via the addition of silver ion Ag+ to the electron-rich metal-metal bond in the μ-alkylidene complexes [Fe2(CO)6{CHC(C6H5)(NRR 1)}P(C6H5)2] (1) is described. These compounds are rare examples of closed triangular M2Ag clusters. Crystals of a typical derivative, 2 (R = H, R1 = CH3, X = ClO4), are triclinic of space group P1 with a = 14.101 (3) A?, b = 10.654 (4) A?, c = 15.777 (4) A?, α = 93.68 (4)°, β = 114.27 (2)°, γ = 95.03 (3)°, and Z = 2. The structure was solved and refined to R and Rw values of 0.046 and 0.055 by using 4617 GE-XRD-6 measured reflections. In the triangular Fe2Ag framework there are two Ag-Fe bonds (Ag-Fe(1) = 2.685 (1) A?, Ag-Fe(2) = 2.703 (1) A?) and an Fe-Fe bond (Fe(1)-Fe(2) = 2.682 (1) A?). The Fe-Fe vector is also bridged by a P(C6H5)2 group and a μ-η1-alkylidene ligand. The nature of the Ag-Fe and Fe-Fe interactions is discussed. Spectroscopic (1H and 31P NMR; IR; Mo?ssbauer) data for the new clusters are presented. The addition of silver salts to electron-rich bi- or polynuclear fragments may have potential as a general route to mixed-metal clusters.
