isogens

Isogens are a type of chemical compound that are structurally isomeric but differ in the position of a specific atom or group within their molecular framework. This definition is quite broad and can encompass various classes of isomers. For instance, positional isomers are a common example where the connectivity of atoms is the same, but the location of a functional group or substituent varies. Another related concept is that of constitutional isomers, which are isomers that have the same molecular formula but differ in the order in which their atoms are connected. The term "isogen" is not as widely used as more specific isomer classifications and might be encountered in older literature or specific subfields of chemistry.

The significance of isogens lies in their potential for distinct physical and chemical properties. Even minor changes in atomic arrangement can lead to differences in boiling point, melting point, solubility, reactivity, and biological activity. Understanding these differences is crucial in fields such as organic chemistry, medicinal chemistry, and materials science, where precise molecular structure dictates function. For example, in drug development, different isogens of a molecule might exhibit vastly different therapeutic effects or side effects. The synthesis and separation of specific isogens are therefore important challenges and areas of research in chemistry.