Thermodynamics And Chemistry a Non Mathematical Treatise for Chemists And Stude
Thermodynamics And Chemistry a Non Mathematical Treatise for Chemists And Stude
Pierre Maurice Marie Duhem
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MIXED CRYSTALS. OPTICAL ANTIPODES. 291 Such a compound possesses two isomeric varieties which have exactly the same chemical and physical properties except one: the right-handed kind, in the state of fusion or of solution, possesses a. Right-handed power of rotation; the left-handed sort has exactly the same rotary power, but to the left. The two varieties of crys- tals are hemiedric; the crystals of the right-handed variety, on reflection in a mirror, reproduce crystals of the left-handed sort... and conversely. These crystals are in general devoid of rotary power; when they are so gifted, the right and left crystals have equal rotary powers, in opposite directions. The stereochemical notation attributes different formulae to these two isomers; one of the formulas is the image of the other in a mirror. These two isomeric substances are said to be enantiomorphous, or to be optical antipodes of each other. Often there is occasion to add a third inactive isomer to these two optical antipodes; devoid of rotary power in all its states, this inactive isomer furnishes holoedral crystals; stereochemistry assigns it a formula which is reproduced, identical with itself, by reflection in a mirror.
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