(Lewis 1997), are aromatic compounds containing chromophores and auxochromes (the causes of their colors covered in Section 4.5.1 of Chapter 4), but they also contain groups which will either ensure their solub
The color of hexahydrates range from light-green to violet; all are hygroscopic; density 1.76 g/cm3; soluble in water and ethanol; insoluble in ether; dilute aqueous solutions are violet in color.Chromium(III) chloride can be used in the formation of a catalytic system for the conversion of...
The catalyst support usually is insoluble in the electron pair donor solvent, such as, for example, an ether/chromium pyrrolide complex solution. Any excess of the chromium pyrrolide in relation to the catalyst support is sufficient. However, usually, less than about 5 grams of chromium pyrrolide...
Cells were then resuspended in 20 mM HEPES, 100 mM NaCl, pH 7.2 with the supplementation of protease inhibitor cocktail (Sigma-Aldrich) and 1 mM TCEP, and subsequently lysed by sonication to separate supernatant (cytosolic fraction) and insoluble debris (fraction including membrane and un...
(III) as an insoluble hydroxide at an alkaline pH. The chemical reductant can be any sulphur-based or iron-based salt. These two steps can be combined into a single step by the electrochemical addition of ferrous ion, rather than the addition of a ferrous salt (FeSO4or FeCl2) which ...
1. A process for the homopolymerization of ethylene or the copolymerization of ethylene with at least one C3 to C10 alpha olefin or diolefin which comprises contacting the monomer charge with a chromium metal catalyst composition which is the colored insoluble product obtained by adsorbing a chromiu...
considered to be critical as it is found that a sufficient catalyst composition most often occurs within about 1 minute or less. In the preparation of the catalytic reaction product, it is not necessary to separate hydrocarbon soluble components from hydrocarbon insoluble components of the reaction ...
insoluble. In both cases, an amount of the organic solvent in addition to the organic solvent contained in the catalyst component solutions is added to the polymerization system. The additional organic solvent may be either the same as or different from the organic solvent contained in the ...
The first peak (or plateau) corresponds to the process of soluble Cr(III) → insoluble Cr(II) species, and the subsequent increase in the cathodic current is related to the reaction of Cr(II) → Cr(0). Currently, significant attention is being given to the investigation of the influence ...