Nonanuclear

Linear multinuclear metal complexes are attracting attention in the context of molecular electronics due to their projected use as molecular wires. 01igo(pyridyl)amido ligands are efficient scaffolds for lining up several Ni11 ions like a string. The first structurally characterized trinickel complex of this type, [Ni3(dpa)4Cl2] (dpa = bis(2-pyridyl)amide), showed a nearly linear Ni3 unit with Ni—Ni distances of around 244 pm.209 Penta-, hepta-, and nonanuclear systems have... 

Deprotonated) dipyridylamine has been the fruitful progenitor of a series of ligands, Scheme 1, which, by increasing the number of coordinating nitrogen atoms, are able to afford (at the moment) from trinuclear to nonanuclear linear metal complexes. 

Actually, the heptanuclear complexes [M7(teptra)4(X)2] (M = Cr, X = Cl 43 M = Ni, X = Cl, NCS39,44) have been structurally character-iaed, but no electrochemical information is available. The same (unfortunately) holds for the highly spectacular nonanuclear complex [Ni9(peptea)4(Cl)2] illustrated in Figure 7.45... 

To complete our survey of structurally-characterized oxide-bridged Mn complexes, we describe species with nuclearities >4. Three distinct types have been reported hexanuclear, nonanuclear and dodecanuclear. The hexanuclear complex Mn602(piv)10(pivH)4 results from the treatment of MnC03 with pivalic acid in reflux-... 

As for the nonanuclear complex, the Mni20i2 core can be structurally related to the Hn402 complexes by noting that the former can be considered as four Mn 02 butterfly units fused together such that a Mn center occupies a hinge position of each butterfly. Four additional bridges then complete the... 

Brechin et al. have recently reported a new class of single-molecule magnets with a nonanuclear manganese core. The reaction of a reduced basic carboxylate compound, [Mn30(0Ac)6(py)3], with l,l,l-tris(hydroxymethyl)ethane (H3thme) afforded the Mn 3Mn 4Mn 2 complex... 

Figure 3.2 Core structures of nonanuclear (a, b, c), decanuclear (d) and undecanuclear (e) gold clusters.

Cadmium methoxide and ethoxide crystallize formed a layered polymeric structure ofCdI2 type as well as Cd(OH)2. The nonanuclear molecule of cadmium 2-methoxyethoxide contains 7 octahedra and 2 5-vertex polyhedron while the metal atom in the structure of[Cd(OC6H4Bu 2-2,6)2THF2] has a square planar coordination. 

The equivalent reaction involving copper and cobalt acetates reacted with Hchp gives a nonanuclear cage, [Co7Cu2(OH)2(chp)io(02CMe)6] (72) (170). Here the copper sites are both five-coordinate, while the... 

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