Cluster tetradecanuclear

A combination of two square-pyramids of [Ln5((jt4-OH)( X3-OH)4] with one hollow octahedron of [Ln6([X3-OH)8] by vertex-sharing leads to the assembly of esthetically pleasing tetradecanuclear complexes with a rod-like cluster core (Figure 6.16). Complexes characterized by such a core have been successfully prepared using aryloxide [34, 35], P-diketonate [87], and amino acid ligands [104],... 

Wang, R., Song, D., and Wang, S. (2002) Toward constructing nanoscale hydroxo-lanthanide clusters syntheses and characterizations of novel tetradecanuclear hydroxo-lanthanide clusters. Chemical Communications, 368-369. 

Roesky and coworkers reported unusual tetradecanuclear clusters formulated as [Ri4(o-02NC6H40)24(/i4-OH)2(/i3-OH)i6] where R = Dy, Er, Tm, Yb (Eigure 16 Burgstein and Roesky, 2000). The cluster core of... 

Ri4(/T4-OH)2(/i3-OH)i6] is the same as those described below whert dike-tonate ligands are used as the ancillary ligands. In fact, this tetradecanuclear cluster core motif is a common one which may be used to construct cluster assemblies of even more sophisticated structures. 

The formally modular assembly of these clusters of different nuclear-ity is rather intriguing. The structural relationship between the penta-nuclear, nonanuclear, and tetradecanuclear species can be clearly appreciated from Figure 112. 

FIGURE 112 Structures of pentanuclear, nonanuclear, and tetradecanuclear cluster cores showing formal modular build-up of their assemblies. 

Burger and Kliifers have reported a tetradecanuclear iron cluster stabilized by a deprotonated poly-ol ligand—me5o-butane-l,2,3,4-tetraol (known as erythritol trivially). The 14 Fe centers form a hexacapped cube which is surrounded by Ca and poly-ol ligands. 

Even more intriguing is the assembly of [Gdi4(/u.4-OH)2(/u.3-OH)i6(H2O)8(Ser)20] , a tetradecanuclear complex with HSer. The cluster core (Figure 11), reported first by using nitrophenolate as the supporting ligand,may be... 

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