Type-I antiferromagnetic

With a few exceptions, the crystal structure of the salts based on the type I mixed chains consists of parallel arrangements of those chains. In most cases the magnetic behavior of these salts is dominated by ferromagnetic (FM) interactions, due to intrachain D+ A coupling. Several of these salts exhibit metamagnetic (MM) behaviors due to the coexistence of weaker antiferromagnetic (AF) intrachain interactions. 

Copper ions in the (I) and (II) oxidation states are biologically important. Basically, three different types of copper centre are shown. Blue of type I copper occurs in the blue electron carrying proteins such as stellacyanin, plastocyanin and azurin. There is also non-blue or type II copper and a type III copper centre that is non-detectable by EPR, apparently containing a pair of contiguous copper atoms. Tyrosinase is a type III protein that is not detected EPR because of antiferromagnetism of a pair of copper in it [137],... 

Fig. 18. Various types of eollinear antiferromagnetic order found by neutron diffraction. is plus spin and o is minus spin, (a) Face-centered first kind, (b) face-centered third kind, (c) face-centered second kind, type I, (d) face-centered second kind, type II, (e) face-centered fourth kind, type I, (f) face-centered fourth kind, type II. (See following pages for Figs. I8(g)-18(q).)...

Figure 7.5 Antiferromagnetic spin ordering patterns, schematic, referred to an idealised cubic unit cell (a) A-type (001) alignment (b) C-type (110) alignment (c) E-type (d) C-type (I II)p alignment...

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