| 单词 |
protic |
| 释义 |
protic, a. Chem.|ˈprəʊtɪk|
[f. proton + -ic.]
Of a liquid, esp. a solvent: possessing protons whose binding is sufficiently loose for them to participate in protonation; hydrogen-bonded.
1944Jrnl. Physical Chem. XLVIII. 53 In all protic solvents, protons enter strongly into any consideration of acid-base properties. 1965Phillips & Williams Inorg. Chem. I. xv. 556 Similarly, in other ‘protic’ solvents a special role is played by substances producing H+ ions, or the characteristic anion of the solvent (e.g. NH2 - in NH3, F- in HF, and HSO4- in H2SO4). 1973E. J. King in Covington & Dickinson Phys. Chem. Org. Solvent Syst. iii. 333 We first distinguish two broad classes [of solvent] based on dielectric constant. In solvents of high dielectric constant, often referred to loosely as polar solvents, ion-pairing is minimal, even negligible in dilute solutions... By contrast, in solvents of low dielectric constant, loosely called non-polar solvents, ion-pairing is important and acid strength depends on the choice of standard base... Each broad class in turn is sub-divided into hydrogen-bonded and non-hydrogen-bonded solvents. The term protic is frequently used for the first sub-division, aprotic for the second. 1975Nature 3 Jan. 40/1 These reactions show that molecular nitrogen can be reduced at a single metal site in a protic medium with negligible discharge of dihydrogen or displacement of dinitrogen by hydride ligands. |
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