Solid paramagnetic

The partial orientation of the elementary dipoles in a paramagnetic solid is counteracted by thermal agitation, and it would be expected that at high temperatures the random motion of the atoms in the solid would cancel the alignment due to the magnetic field. The paramagnetic susceptibility would therefore be expected to vary with temperature. The temperature dependence is given by the Curie law ... 

Frequently the magnetic behavior of a paramagnetic solid does not follow the Curie law exactly but is rather better fitted by the Curie-Weiss law ... 

The partial orientation of the elementary dipoles in a paramagnetic solid is counteracted by thermal agitation, and it would be expected that at high temperatures... 

Figure S6.1 Magnetic structures (a) paramagnetic solid, (b) ferromagnetic ordering, (c) antiferromagnetic ordering, and (d) ferrimagnetic ordering. The magnetic dipoles on atoms are represented by arrows.

The systems CrCl Mg-THF and CrCl2-Mg-dppe-THF absorb nitrogen and some NH3 and N2H4 are produced on hydrolysis. The paramagnetic solids Cr2N2Mg4Cl4(THF)5 (black) and [Cr(dppe)2]2N2 (brown), which are difficult to obtain reproducibly, have been isolated.58... 

Equations ol states of various types of systems are numerous. The Curie equation is the equation of state of a paramagnetic solid. The Beattie and Bridge-man equation. Berthelol equation. Clausius equation. Dieterice equation. Keyes equation, and Van der Waals equation are other examples in this category. 

Paramagnetic solids have a net magnetization that is the sum of individual moments, except for their thermal orientational disorder. 

The iron(O) complex [Fe(terpy)(CO)2] is readily prepared by the reaction of terpy with [Fe(cot)(CO)3] (cot, cyclooctatetraene) (41,46) in contrast, [Fe(terpy)2] may be obtained as an air-sensitive, paramagnetic solid from the reduction of [Fe(terpy)2]l2 with lithium benzophenone ketyl (240). 

The pentafluorides are made by direct fluorination of the metals or the pentachlor-ides. Both are volatile white solids (Nb mp 80°C, bp 235°C Ta mp 95°C, bp 229°C), giving colorless liquids and vapors. They have the tetranuclear structures shown in Fig. 18-B-3. Niobium(IV) fluoride is a black, nonvolatile, paramagnetic solid TaF4 is unknown. 

When the dithiole ring is annelated by phenalene, the laws of valence require the resultant aromatic heterocycle to be cationic reduction thus gives the neutral phenaleno[l,9-c(/][l,2]dithiolyl radical (138). This persistent radical has been examined in solution and its hyperfine splittings assigned on the basis of MO calculations. The radical is remarkably stable against dimerization it may be isolated as a paramagnetic solid whose mass... 

Two paramagnetic forms have been made. When sulphur vapour at 500-700 and 1 mm, consisting mainly of Sg molecules, is passed over a surface at —196°, a purple paramagnetic solid is obtained which may contain Sg molecules. At —80 it reverts to S. In the same circumstances the vapour from liquid sulphur gives a green solid, less strongly paramagnetic, and possibly made up of chains of S atoms. It reverts to S when the temperature is raised (Freud, Adler and Sparrow, 1953). 

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