hard acid

https://doi.org/10.1351/goldbook.H02740
A @L03508@ with an acceptor centre of low @P04711@. Other things being approximately equal, complexes of hard acids and @H02742@ or soft acids and bases have an added stabilization (sometimes called 'HSAB' rule). For example the hard O- (or N-) bases are preferred to their S- (or P-) analogues by hard acids. Conversely a @S05724@ possesses an acceptor centre of high @P04711@ and exhibits the reverse preference for @C01329@ of a @S05725@. These preferences are not defined in a quantitative sense.
See also:
class (a) metal ion
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1120 [Terms] [Paper]
Citation: 'hard acid' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.H02740 RIS BibTex EndNote
Div. IIIPDFTextJSONHistory
Last revised: October 7, 2008