Tripode Ligands

Other 5-coordinate Co compounds which have been characterized include [CoBr- N(C2H4NMe2)3 ]+, which is high-spin with 3 unpaired electrons and is trigonal bipyra-midal (imposed by the tripod ligand), and... 

Cirunwald-Winstein analysis, 1,505 thiocyanates, 3, 729 thiourea, 3, 755 tricyanomethides, 3, 709 triethylenetetramine, 3, 722 tripod ligands tetradentate, 3,734... 

Besides such intermolecular stabilized compounds, intramolecular stabilized compounds have also been reported. Rettig et al. described the synthesis of phosphine-stabilized Al—N monomers by using a tripodal ligand [101]. More recently, Raston et al. reported on the synthesis of compounds of the type [H2A1E(H)R]2, containing only weak Al—H bridges [102]. 

Iron(II) complex of tris(N -tert-butylurea-ylato)-N-ethylene]aminato activates dioxygen at room temperature to afford an iron(III) complex containing a single terminal oxo ligand. X-ray structures show that the three urea molecules act as a tridentate N,N,N-hgand [52]. The tripodal ligand was also used to synthesise complexes of cobalt, iron or zinc with terminal hydroxo ligands (Scheme 8) [53]. 

Figure 3. The molecular structure of the oxygen tripod ligand [Cp 3Cr3(jX3-0)(p2-OH)3) Q ...

Casares, J.A., Espinet, P., Hernando, R., Iturbe, G., Villafane, F., Ellis, D.D. and Orpen, A.G. (1997) Poly(2-pyridyl) phosphines, PPynPh3 (n = 2, 3), and Their P-Substituted Derivatives as Tripodal Ligands in Molybdenum(O) Carbonyl Complexes. Inorganic Chemistry, 36(1), 44-49. 

Complexes with polypyrazolylborates and related tripodal ligands 300... 

The coordination mode of bis(imidazolyl)(pyrazolyl)borates towards Ni11 depends on the steric congestion around the boron center caused by substituents in the pyrazol 5-position. Complexes (207) or (208) have been obtained upon reaction with Ni(N03)2.619 The tripodal ligand... 

Ligands of the type RN[(CH2)2SH]2 (R = alkyl, aryl, (CH2)2SH, (CH2)2SR) form dimeric S-bridged complexes (465) with Ni11. In the case of tripodal ligands the third arm rests uncoordinated.1293-1 96... 

The tripodal ligand (550) with N2OS donor set reacts with Ni(0Ac)2 4H20 or Ni(C104)2 6H20 to give multinuclear Ni11 complexes (Scheme 7). 

Table 1 Stereochemistries of copper(II) complexes of aliphatic tripodal ligands.

Using a new tripodal ligand, Sorrell and co-workers synthesized compound (61).83 The dioxygen reactivity of the pseudotetrahedral complex of this ligand of composition [(L)Cu(MeCN)][BF4] (not structurally characterized) was examined. In MeOH at —78 °C, the thermal decomposition of the side-on peroxodicopper(II) adduct in the presence of water yields a bis(hydroxide)-bridged... 

Partial hydrolysis of a potentially heptadentate Schiff-base tripodal ligand derived from tris-(2-aminoethyl)amine and 2-hydroxyacetophenone, induced by copper(II) salts, was reported and the final copper(II) complex (377) was characterized.333 Using salicylaldehyde as a co-ligand, with a copper(II) complex (378), catalytic epoxidation was demonstrated 334... 

Polydentate nitrogen donor tripod ligands are discussed in this section. Mixed donor ligands containing nitrogen donors are discussed in Section 6.8.11. 

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