MnCu

Figure 1. Induced spin density map for MnCu(pba)(H20)j. 2H20 at 10K under 5 T in projection along the perpendicular to the basal plane. Solid and dashed lines are used respectively for negative and positive spin densities. Contour steps are 5 mpB/A2. The spin delocalisation is more pronounced toward the N atom than the O atoms.

Baron, V., Gillon, B., Kahn, O. et al. (1993) Spin density in a bimetallic magnetic chain MnCu(pba)(H20)3. 2H20 a polarised neutron diffraction study, Mol. Cryst. Liqu. Cryst., 233, 247-256. 

The permanganate ion, MnCU-, has a beautiful, intense purple colour, and is a popular choice for oxidation reactions. The colour is intense even if the solution is dilute. 

Mn(bipy)jCu(pdmg)] +, 43 235 [MnCrlox),], structure, 43 228-229 [MnCuCdmgl CHaOljCCHjCOj)], 43 243-244 MnCu(obbz) HjO, magnetization versus temperature, 43 222... 

MnCu(opba)(DMSO)3 structure, 43 196-197 zigzag chain structure, 43 198-199 MnCuCopbaKHiOlj DMSO, structure, 43 196 Mn[Cu(oxpn)l3 =+, 43 217 MnCulpbaOHXHjOlj magnetization versus temperature, 43 193, 195... 

Figure 3. Structure of the linear chain MnCu(opba)(H20)2-DMSO (top) and of the zigzag chain MnCu(opba)(DMSO)3 for clarity only the coordinating oxygen atoms of DMSO are represented (bottom).

Fig. 7. Effect of activation of rabbit liver FDPase by homocystine on the pH activity curves (51). (A) Assayed with MgCL (B) assayed with MnCU.

The yield of MnCl(NBu )3 corresponds to this stoichiometry and Mnn is found in the residual products as the MnCU" salt. 

An elegant example of this process is the compound MnCu(pba)(H20)3-21120, where pba=l,3-propylenebis(oxamate). This compound contains the mononuclear dianion [Cu(pba)] as an unbreakable copper... 

The magnetic susceptibility of MnCu(pba)(H20)3-2H20 rises continuously upon cooling from room temperature until 2.4 K, where 3D ordering occurs (see Figure 34). Identification of the ferrimagnetic nature of the chain is observed in the characteristic minimum in the x T product near 115 K (insert). 

The situation in the 18 valence electron series MnCu, MnAg, MnAu is similar but different. Whereas MnAg is easily formed and characterized as a molecule, MnCu (and MnAu) remains undetected... 

The complexes [MntH 0)r,]. [Fe(HjOU. [MnCU. and IFeCLJ" all have majj-nelic momerls ol nearly 5 92 BM. What does this tell you about the geometric and electronic structures of these complexes Why is the spin-only formula so precise in these cases ... 

Systems of randomly oriented magnetic nanoparticles randomly dispersed in a supporting medium or matrix and that interact via dipole-dipole forces (last subsection) are systems having several energetically equivalent supermoment orientational states, at given temperatures and applied fields. As such, it is relevant to compare their magnetic behaviors with both the observed behaviors of canonical SG systems (dilute magnetic alloys such as MnCu) and the theoretical predictions from overly simple SG models. This has lead to a productive examination of the effects of dipolar and other inter-particle interactions in synthetic nanoparticle model systems that is reviewed below. Hopefully, this will in turn motivate the development of more realistic theoretical models of disordered dipolar systems. 

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