Diamagnetic species nitrogen oxides

Cu2(L )(NCS)2] (66), which has been shown (c.f. Fig. 8) [43] to contain two tetrahedrally coordinated Cu(I) ions held 2.796(8) A apart and linked inter-molecularly via the sulfur atoms of the thiocyanate ions. For the complexes 63 and 64, the reduction product is the diamagnetic complex [Cu2(L )(MeCN)2](Y)2 (67) (Y = CIO4 or BPh4) in which each three coordinate Cu(I) ion is bonded to two of the four macrocyclic nitrogen atoms and to the nitrogen of one of the two MeCN molecules (Fig, 9) [43]. In the presence of certain substrates the reduction of 63 or 64 is accompanied by substrate oxidation. For example, PhSH, PhC=CH, hydrazobenzene, catechols, hydroquinone, and ascorbic acid afford PhSSPh, PhC=CCsPh, azobenzene, o-quinones, p-quinone, and dehydroascorbic acid, respectively, together with the reduced species 67 and/or other copper complexes... 

A superconductor becomes diamagnetic below its critical temperature (greater than the liquid nitrogen temperature for the copper oxide-based superconductors). So if a porous membrane is prepared with superconducting material, it should preferentially repel the paramagnetic species below its critical temperature (Figure 25.5a). The separation mechanism can be explained from the mirror... 

---