enantiomorphs

Enantiomorphs are two mirror-image forms of a chiral object that cannot be superimposed. The concept is central to chirality, which describes objects that have a handedness, like left and right hands. In chemistry, the pair of non-superimposable mirror images are usually called enantiomers. In crystallography, enantiomorphs refer to two crystalline forms that are mirror images of each other, often arising from chiral arrangements in the crystal lattice.

The term comes from the Greek roots enantios meaning opposite and morphe meaning form. While enantiomorphs share many properties in an achiral environment, their handedness matters in interactions with other chiral systems, such as biological molecules or polarized light.

Physical properties of enantiomorphs are largely identical in neutral, non-chiral surroundings. They rotate plane-polarized light in equal magnitude but opposite directions, a phenomenon known as optical activity. In chiral environments, however, enantiomorphs can behave very differently—displaying different reaction rates, binding affinities, or biological activities.

Common examples include the enantiomeric pair of lactic acid, and the two enantiomorphic forms of quartz crystals, which are mirror images of each other. In chemistry and pharmacology, recognizing and separating enantiomorphs (a process called resolution) is important because different enantiomers can have distinct effects in living systems.

See also: enantiomer, chirality, stereochemistry, optical activity, enantiomorphic space groups.