Susceptibility saturated

At high temperatures the magnetic susceptibility (Menth et al., 1969 Nickerson et al., 1971) of SmB6 (fig. 20.10) falls between the susceptibilities of the Sm and Sm configurations. At low temperatures the susceptibility saturates with no evidence of magnetic order down to 0.35 K. The electronic contribution to the SmBe heat capacity (Nickerson et al., 1971) is large... 

Note that the 14 ppm of ammonia measured in the accumulated condensate may not accurately reflect the potentially higher level of ammonia dissolved in a thin film of moisture that could form on the metal wall in the region of initial condensation. This film of water could be saturated witb ammonia, increasing susceptibility of the metal to SCC. 

Aromatic rings are hydrogenated with a variety of catalysts. However, aromatic alkoxy and hydroxyl substituents are susceptible to hydrogenolysis under most conditions used to saturate the ring. Hydrogenolysis does not occur to any appreciable extent with ruthenium catalysts even though high temperatures and pressures are required. Thus, substituted phenols are... 

Ruthenium is excellent for hydrogenation of aliphatic carbonyl compounds (92), and it, as well as nickel, is used industrially for conversion of glucose to sorbitol (14,15,29,75,100). Nickel usually requires vigorous conditions unless large amounts of catalyst are used (11,20,27,37,60), or the catalyst is very active, such as W-6 Raney nickel (6). Copper chromite is always used at elevated temperatures and pressures and may be useful if aromatic-ring saturation is to be avoided. Rhodium has given excellent results under mild conditions when other catalysts have failed (4,5,66). It is useful in reduction of aliphatic carbonyls in molecules susceptible to hydrogenolysis. 

The parameter 5 is a measure of the susceptibility of the substrate to nucleophilic attack, and n a measure of the nucleophilic reactivity as defined by a reference reaction. The rate constants for attack at saturated carbon are used to define the values of n.14 Table 10-4 lists the values of n for certain nucleophiles. This particular compilation lists the... 

Simultaneous weight-change and diamagnetic-anisotropy measurements upon adsorption and desorption of bromine in PG have been carried out (M4). They showed that final susceptibility values are reached well before full bromine saturations, and remain until 80% desorption is attained. 

Samples for studies of CDx effects on fluorescence enhancement in organic solution were prepared using pyrene, because pyrene possesses a long lifetime and is very susceptible to quenching and enhancement in solution (23). An aliquot of pyrene stock solution in cyclohexane was placed under a nitrogen purge to evaporate the cyclohexane. Samples were redissolved in a 1 A mixture of Isopropyl ether and 1-butanol, which was saturated with aqueous CDx solution. Pyrene samples were also prepared in which the organic solvent was not saturated with CDx solution. The mixed solvent was used in order to minimize the effects of ether evaporation and thus allow more accurate quantitation. Fluorescence measurements were made on diluted samples of these solutions. The solvent used to make up the... 

---