Copper complexes octanuclear

Two octanuclear copper complexes were reported. Of these, the arrangement of the copper atoms in a cube was suggested for [Cu—CgH4—m—CF3]g (76) and proved for the anion Cug(dts) " (dts = dithiosquarate) (266). 

Copper(I) pyrazolates react with neutral ligands (L), such as 1,10-phenan-throline and cyclohexyl isocyanide, giving binuclear complexes of general formula [Cu(pzXL)]2.9,10 Solutions of [Cu(dmpz)]3 in pyridine rapidly absorb oxygen in the presence of water, giving the blue octanuclear hydroxo-... 

Trifluoromethyl)phenylcopper was found to be an octamer by consideration of the kinetics of its decomposition, and by cryoscopy and vapor pressure osmometry in benzene solution 36). Its F NMR spectrum in ether at room temperature is a sharp singlet. Consequently, the suggested structure is a central copper cube with equivalent bridging benzotri-fluoride groups. The initial decomposition product, Cu8( n-CF3CgH4)e, is considered to be a Cu(0)—Cu(I) octanuclear cluster compound 36). For the octameric m-(trifluoromethyl)phenylcopper, the tetrameric ortho isomer, and pentafluorophenylcopper tetramer, the F NMR spectra were found to vary with temperature. The changes are not considered to involve important structural alterations, but only variations in solvent complexes and rotamer populations 32, 37). The spectra also... 

Unexpected octanuclear mixed-bridged copper(lI)-pyrazolate complexes, [Cug(/x-OH)8(fi-pz )8] (Hpz = Hpz, 181 Hdmpz, 182), were isolated on treat-... 

Figure 9. Structure drawing of the octanuclear copper(ll) complex [Cu8(dmpz)8(OH)8], 182. [Based on data from (137).]...

The octanuclear copper(II) hydroxo complex [Cu8(dmpz)8(OH)8], 182, has been identified as the active intermediate species when [Cu(dmpz)]3 is used (137). In the case of [Cu(dppz)]4, the intermediacy of a copper(II) imido species (17) has been proposed on the basis of chemical and spectroscopic evidences. 

The use of mixtures of organic Kgands appears to lead to higher nuclearities than result from the use of single Kgands. Examples of this are the octanuclear copper(II) complexes [Cug02(02CR)4(chp)8]... 

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