Non magnetic behavior

Spectroscopic studies [118] of [Cu(5)Br2] suggest NNS coordination and a dimeric halogen bridged complex. This assignment is consistent with non-electrolytic behavior in DMF, but not with a magnetic moment at room temperature of 1.79 B.M. The shift of the thioamide 4 band from 815 cm" to 800 cm on complexation is taken as evidence for coordination of the... 

In 1996 Stack and co-workers reported an unusual 3 1 (copper 02 stoichiometry) reaction between a mononuclear copper(I) complex of a A-permethylated (lR,2R)-cyclohexanediamine ligand with dioxygen. The end product of this reaction, stable at only low temperatures (X-ray structure at —40 °C) is a discrete, mixed-valence trinuclear copper cluster (1), with two Cu11 and a Cu111 center (Cu-Cu 2.641 and 2.704 A).27 Its spectroscopic and magnetic behavior were also investigated in detail. The relevance of this synthetic complex to the reduction of 02 at the trinuclear active sites of multicopper oxidases4-8 was discussed. Once formed, it exhibits moderate thermal stability, decomposed by a non-first-order process in about 3h at —10 °C. In the presence of trace water, the major isolated product was the bis(/i-hydroxo)dicopper(II) dimer (2). 

One key conclusion is that the entire molecule must be taken into account to understand the aromatic properties of icosahedral fullerenes. The 2(N -1-1) rule of spherical aromaticity also sufficiently describes the magnetic behavior of non-icosahedral fullerenes [128], homoaromatic cage molecules [129], and inorganic cage molecules [130],... 

As has been shown in Sections 3.3-3.7, the superconducting properties, in particular the behavior of the upper critical field Hc2, of the non-magnetic borocarbides... 

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