Hydron usage

Cations can also be obtained by the formal addition of a hydron (hydron is the recommended name for the normal isotopic mixture of protons, deuterons and tritons, see p. 7) to a binary hydride. In such cases, a formalism of substitutive nomenclature is used the suffix -ium is added to the name, slightly modified, of the parent hydride. The selection of permitted hydride names and their usage are discussed in Section 4.5 on substitutive nomenclature. 

Some variants are also allowed for mononuclear cations of Groups 15, 16 and 17. These are based on the usage of substitutive nomenclature, where the formal addition of a hydron to a parent hydride to give a cation is represented by the suffix -onium. 

This is a new recommendation. Note that it implies that all uses with respect to acids and bases involving tbe normal isotopic mixture of h. 2H. and 3H would require the use of hydron, i.c., the hydron affinity of bases, Brpnsied acids are hydron donors, etc. Wc have retained the current usage of proton affinity, etc., because the recommendation came out as this book was going to press. The reader should note however that hydron is already receiving some European usage, as in "GS = GSH dehydronated at the thiol group."]... 

Anoxoncid is a compound which contains oxygen, at least one other element, at least one hydrogen bound to oxygen, and which produces a conjugate base by loss of positive hydrogen ion(s) (hydrons). The limits of this class of compound are dictated by usage rather than rules. 

More precisely, a Bronsted acid is a substance from which a hydron can be removed and a Bronsted base is a substance that can remove a hydron from an acid. Hydron is a genered term for H+, irrespective of isotope, and it includes the proton ( H ), deuteron ), and triton ). This distinction is useful in discussions of isotope effects, but it is seldom made otherwise. The term proton has long been used to represent H in general as well as to represent the specific isotope H +. Because of this familiar usage, a mechanistic discussion that uses the terms protonation and deprotonation may be clearer than an analysis that uses the terms hydronation and dehydronation. The discussion here will therefore retain the term proton as a general term for H. Use of the term proton to mean the specific isotope H+ can be rmderstood in context. 

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