hard acid
hard acid
[′härd ′as·əd] (chemistry)
A Lewis acid of low polarizability, small size, and high positive oxidation state; it does not have easily excitable outer electrons; some examples are H+, Li+, and Al+.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
According to Huheey, Keiter and Keiter (1997) [Cd.sup.2+] is considered a soft acid whereas [Zn.sup.2+] is a borderline one, which means that [Zn.sup.2+] is not a soft acid neither
hard acid. Pearson (1963) affirms that the interaction between soft species is more polarizable than hard ones, and
hard acids prefer to bind to
hard acids, while soft acids prefer to bind to soft bases.
INA has two coordination sites; one is N which is suitable to coordinate to a soft acid metal (Cu) and the other is O which is suitable to coordinate with
hard acid metal (Pr).
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