Isomeerids

Isomeerids is a term occasionally used in speculative literature to describe a class of molecular species that exist as multiple isomeric forms capable of interconverting under defined conditions. It is not part of standard chemical nomenclature, and its usage remains uncommon and controversial. In this framework, an isomeerid comprises a set of interconvertible forms that share the same molecular formula and a common core but differ in connectivity or stereochemistry in a reversible cycle.

Definition and properties: Isomeerids would be defined by dynamic isomerism with measurable barriers between forms and populations that shift with temperature, solvent, or stimuli. Interconversion mechanisms could include bond rearrangements, ring openings and closures, or sigmatropic shifts that conserve composition.

Relation to established concepts: The idea overlaps with conformational isomerism and tautomerism but emphasizes reversible interconversion among well-defined forms rather than static species. It also sits near constitutional isomers in terms of connectivity changes, but the focus is on dynamic exchange.

Characterization: Experimental methods would include variable-temperature NMR to observe exchange, two-dimensional NMR for exchanging forms, IR or UV-Vis spectroscopy for form-specific signatures, and crystallography to capture distinct solid-state forms. Computational studies could map energy barriers and plausible pathways.

Status and examples: There are no widely cited, real-world examples of isomeerids in standard literature. The term remains speculative and is primarily of interest in discussions about dynamic molecular systems and switchable materials. If adopted, a formal definition and community consensus would be required.