configuration(redirected from configurational)
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configuration(kon-fig-yŭ-ray -shŏn) See aspect.
Configuration(religion, spiritualism, and occult)
Traditionally, the term configuration was used to refer to any aspect. In contemporary astrology, the term is reserved for sets of interrelated aspects involving three or more planets, such as T-squares, grand trines, and so forth. By extension, the configuration is sometimes used to refer to the pattern presented by the entire horoscope.
(of molecules). In stereochemistry the configuration characterizes the spatial arrangement of atoms or groups of atoms in an asymmetric atom, in an asymmetrically substituted double bond, in a small (rigid) ring, and in the central atom of complex compounds.
The differences in configuration are determined by the existence of two types of stable stereoisomers: geometrical and optical isomers. Chemical and particularly physical methods of investigation are widely used in determining the configuration of molecules. Thus, using a special X-ray technique, it has been possible to demonstrate, for example, the spatial arrangement of substituents around asymmetric carbon atoms (designated by asterisks) in a molecule of tartaric acid—dextrorotatory (I) and levorotatory (II):
The configuration of a molecule does not alter with changes in its conformation, that is, the rotation of individual parts of a molecule relative to one another about single bonds. Sometimes (for example, in the chemistry and physical chemistry of macromolecular compounds), the term “configuration” is used in a broader sense to include the entire spatial model of a molecule.
V. M. POTAPOV