| 释义 |
polyacid, a. and n. Chem.|pɒlɪˈæsɪd|
Also poly-acid.
[f. poly- + acid.]
†A. adj. Applied to a base which requires more than one equivalent of acid for neutralization, and to a salt of such a base; of an alcohol, polyhydric. Obs.
1858Proc. R. Soc. IX. 152 It became extremely probable that the action of ammonia upon poly-acid alcohols would give rise to poly-ammonium bases. 1880E. Cleminshaw Wurtz' Atom. Th. 198 Some time afterwards, when the existence of polyacid bases was admitted,..Graham discovered polybasic acids. 1904Jrnl. Chem. Soc. LXXXVI. i. 698 (heading) The polyacid salts of rosaniline. 1912E. Feilmann tr. Molinari's Treat. Inorg. Chem. 423 When the salt is formed by the action of an acid on a base which has more than one hydroxyl (OH) group, that is, in the case of polyacid bases, such as Bi(OH)3, Pb(OH)2,..various types of salts may be formed. 1920[see B]. 1926N. H. Furman Kolthoff's Indicators iv. 117 When all of the dissociation constants of polybasic acids, or polyacid bases are large, they behave like strong monobasic or acid compounds upon neutralization.
B. n. A compound which has more than one acidic group; esp. an acid containing polymeric anions. Occas. also attrib. or as adj.
1911Jrnl. Chem. Soc. C. i. 265 The extension of Werner's co-ordination theory to poly-acids..facilitates the correct formulation of these acids. 1920T. H. Pope tr. Molinari's Treat. Inorg. Chem. (ed. 2) 274 Several molecules of a polybasic acid are able to condense and form polyacids, such as pyroantimonic, pyrophosphoric, and pyrosilicic acid, etc., and in the same way it is known that the polyacid bases, also called polyhydric bases, condense to form polybases or polyhydroxides. 1939L. Pauling Nature Chem. Bond vii. 226 The pyro, meta, and other polyacids of the second-row atoms contain MO4 tetrahedra condensed by sharing oxygen atoms. 1950N. V. Sidgwick Chem. Elements II. 999 The molybdates and tungstates go much further, forming the highly condensed polyacids and hetero-poly-acids. 1964Biophysical Jrnl. IV. i. Suppl. 11 The polyelectrolyte nature of some polyacid and polybase polypeptides endows them with inhibitory activity in enzymatic reactions. 1974D. M. Adams Inorg. Solids vii. 239 The main features of polyacid chemistry have been recognized for a long time, but not understood. |