Dioxygeni

Dioxygeni is not a standard chemical term with a single, widely accepted definition in modern chemistry. The word has appeared in various contexts as an informal or historical label for species containing two oxygen atoms, or as a neologism in fiction or popular science. In serious chemical writing, more precise names are used, such as dioxygen for the diatomic molecule O2 or dioxygenyl for the cation O2+. The lack of a single definition means that "dioxygeni" can be ambiguous without context.

In actual chemistry, several well-characterized two-oxygen species are encountered. The diatomic molecule O2 (dioxygen) is central to biology, combustion, and atmospheric chemistry. The dioxygenyl cation O2+ forms salts and is a strong oxidizer studied in inorganic chemistry. Another well-known example is dioxygen difluoride, O2F2, a highly reactive fluorinating agent that is unstable at room temperature and decomposes to O2 and F2.

Because the term falls outside a precise nomenclature, specialists generally rely on the explicit name of the species involved. When referring to two oxygen atoms in a molecule or ion, it is better to use specific descriptors such as O2, O2+, or O2F2 to avoid ambiguity. Related concepts include peroxide species (O–O single bonds) and reactive oxygen species such as superoxide, which are part of broader discussions of oxygen chemistry.