Trimetallic complexes

A reaction of C0CI2 with 2 equivalents of the lithium ferrocenyl amidinate EcC(NCy)2Li(Et20) in THE gave the trimetallic complex [FcC(NCy)2l2Co (Scheme 148, Figure 26) in good yield. ... 

The family of complexes which contain amide/alkoxide functionalities constitute the largest group. The reaction of lithium anilide with TuONa, cBuOK, and TMEDA in a 2 1 1 2 ratio produced the remarkable trimetallic complex... 

Let us start our examination with the dpa-metal complexes. A series of trimetallic complexes of general formula [M3(dpa)4Cl2] (M = Cr,30 Ni,31 Co,32 Cu,33 Ru,34 Rh,34) have been structurally characterized. As illustrated in Scheme 2, such trinuclear complexes in the solid state can display either a symmetrical or an unsymmetrical M3 chain, depending upon if the metal-metal bond is extended over the three metal atoms, or is localized only between two metal atoms.35... 

Extension to trimetallic complexes has led to the preparation of similar bridging carbene and carbyne complexes with Pt3,421 Pt2W422 and PtWFe423 metal frameworks. 

The reaction of zinc ethanoate with 1,4,8,11-tetrathiaundecane gives the trimetallic complex (116) which transmetallates on treatment with [Ni(H20)6]2+. 

Axial symmetry in trimetallic lanthanide complexes requires the location of the metal ions along the molecular threefold or fourfold axes. Since the terminal coordination sites are different from the central coordination site for symmetry reasons, two different crystal-field parameters 2terminal ancj /)2ccntral must be considered. Equation (61) holds for the general case of three (n = 3) magnetically non-coupled lanthanide metal ions packed along the symmetry axis and eqs. (62)-(64) can be used for homotrimetallic axial complexes. To the best of our knowledge, only one partial study of the NMR data for a >3-symmetrical axial trimetallic complex has been reported (Bocquet et al., 2002 Floquet et al., 2003 see sect. 5.1.2). The Dih-symmetrical complexes [R3(L16-3H)2(OH2)6]3+ do not fit the requirements for axial symmetry since the metal ions are located on mirror planes and not on the threefold axis, but... 

Only one trimetallic twelve-vertex metallocarborane has been reported. This species, (C5H5)3Co3C2B7H9, arose as a side product during the polyhedral expansion of 2-C5H6-2-Co-l,6-C2B7H9 with Co(II) and C6H5 (25, 28). The isolation of this trimetallic complex suggests that the polyhedral expansion reaction may be extended to bimetallic substrates to produce novel metal-rich polyhedra. 

When subjected to the action of alcoholic base and excess Co(II) in the absence of additional cyclopentadienidc ion, the thirteen-vertex monometallocarborane reacts to produce a trimetallic complex that contains two bridging thirteen-vertex frameworks (23). The proposed structure of this species is shown in Fig. 17. This reaction is similar to that used to prepare the twelve-vertex bi- and trimetallic chain complexes discussed in Section III, B. 

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