Isomerit

Isomerit is a term used in theoretical chemistry and materials science to describe a hypothetical molecular solid that can reversibly switch between distinct isomeric forms without changing its overall composition. In proposed models, the material exists in at least two forms, commonly referred to as Isomerit-A and Isomerit-B, with different connectivity or conformation that give rise to different physical properties.

The core idea behind Isomerit is dynamic isomerism: the interconversion between forms is reversible and can be triggered by external stimuli such as light, heat, or changes in pressure. In model systems, photoisomerization and thermoisomerization are cited as primary mechanisms, allowing properties like optical absorption, refractive index, and mechanical stiffness to be tuned on demand. The energy barrier separating the forms is a key parameter, influencing switching speed, stability, and fatigue resistance.

Structures described for Isomerit are typically crystalline lattices built from modular units linked by reversible covalent bonds or robust supramolecular interactions. In Isomerit-A, the units arrange into a more extended network, while Isomerit-B features an alternative bonding pattern that results in a different packing and property set. Although Isomerit remains primarily a conceptual framework, researchers explore Isomerit-like behavior in real compounds and assemblies to study switching dynamics, durability, and potential performance limits.

Potential applications envisioned for Isomerit include data storage, smart or responsive materials, sensors, and actuators, where reversible switching of structure and properties could enable new modes of control. The concept serves as a reference point for discussions of dynamic covalent chemistry and molecular switching.