Crystal structure and low-temperature methyl-group dynamics of cobalt and nickel acetates
The crystal structures of cobalt and nickel acetate tetrahydrate have been determined at room-temperature and liquid-helium temperature by neutron powder diffraction of the fully deuterated salts. Molecular mechanics and ab initio methods based on these s
Process for the production of bis-azomethine pigments
A process for the production of a bis-azomethine pigment having the formula STR1 in the pigmentary form in which it has an orange red color and, under the conditions defined by the C.I.E. system of color measurements, has an x chromaticity coordinate of from 0.59 to 0.63 and a y chromaticity coordinate of from 0.33 to 0.36, which process comprises: (a) forming a suspension of 2-hydroxy-1-naphthaldehyde in an alkaline medium in the presence of an antioxidant, (b) reacting this suspension with the stoichiometric proportion of o-phenylene diamine required to form the compound having the formula STR2 (c) metallizing the compound of formula II with a solution of a nickel salt (d) reacting the metallized compound of formula II with the stoichiometric proportion of 2-hydroxy-1-naphthaldehyde required to form the compound of formula I and (e) isolating the compound of formula I.
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(2008/06/13)
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