mesomerismn.

Brit.

/mɛˈsɒmərɪz(ə)m/,

/mᵻˈsɒmərɪz(ə)m/, U.S.

/məˈzɑməˌrɪz(ə)m/; see also meso- comb. form.

Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: meso- comb. form, -merism comb. form.

Etymology: < meso- comb. form + -merism comb. form, in sense 1 after French mésomérie (A. Cornillot 1927, in Ann. de Chim. 8 267).

Chemistry.

1. A term proposed for: a kind of tautomerism (see quot. 1928). rare.

ΘΚΠ

the world > matter > chemistry > isomerism > [noun] > structural isomerism > tautomerism > types of

prototropy1923

anionotropy1928

mesomerism1928

1928 Chem. Abstr. 22 2155 The term mesomerism is proposed to designate affinitive tautomerism and distinguish it from structural tautomerism (or desmotropism) and activation tautomerism (or tautomerism proper).

2. The property exhibited by certain molecules of having a structure which cannot be adequately represented by a single structural formula, and which can be said to be intermediate between two or more structures which differ only in the distribution of electrons. Also called resonance.

ΘΚΠ

the world > matter > chemistry > mesomerism > [noun]

resonance1927

mesomerism1934

1934 Nature 23 June 947/1 Mesomerism and tautomerism are different concepts.

1951 I. L. Finar Org. Chem. I. ii. 15 Heisenberg (1926), from quantum mechanics, supplied a theoretical background for mesomerism; he called it resonance, and this is the name which is widely used.

1973 B. J. Hazzard tr. H. Becker et al. Organicum iii. iv. 147 The capacity of a substituent for entering into mesomerism with a neighbouring double bond is defined as the mesomeric effect, and its sign is determined..by the polarization of the substituent accompanying the mesomerism.

1981 P. Sykes Guidebk. to Mechanism in Org. Chem. (ed. 5) x. 272 The mechanism..nicely illustrates the difference between tautomerism and mesomerism.

This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).

单词	mesomerism
释义	mesomerismn. Brit. /mɛˈsɒmərɪz(ə)m/, /mᵻˈsɒmərɪz(ə)m/, U.S. /məˈzɑməˌrɪz(ə)m/; see also meso- comb. form. Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: meso- comb. form, -merism comb. form. Etymology: < meso- comb. form + -merism comb. form, in sense 1 after French mésomérie (A. Cornillot 1927, in Ann. de Chim. 8 267). Chemistry. 1. A term proposed for: a kind of tautomerism (see quot. 1928). rare. ΘΚΠ the world > matter > chemistry > isomerism > [noun] > structural isomerism > tautomerism > types of prototropy1923 anionotropy1928 mesomerism1928 1928 Chem. Abstr. 22 2155 The term mesomerism is proposed to designate affinitive tautomerism and distinguish it from structural tautomerism (or desmotropism) and activation tautomerism (or tautomerism proper). 2. The property exhibited by certain molecules of having a structure which cannot be adequately represented by a single structural formula, and which can be said to be intermediate between two or more structures which differ only in the distribution of electrons. Also called resonance. ΘΚΠ the world > matter > chemistry > mesomerism > [noun] resonance1927 mesomerism1934 1934 Nature 23 June 947/1 Mesomerism and tautomerism are different concepts. 1951 I. L. Finar Org. Chem. I. ii. 15 Heisenberg (1926), from quantum mechanics, supplied a theoretical background for mesomerism; he called it resonance, and this is the name which is widely used. 1973 B. J. Hazzard tr. H. Becker et al. Organicum iii. iv. 147 The capacity of a substituent for entering into mesomerism with a neighbouring double bond is defined as the mesomeric effect, and its sign is determined..by the polarization of the substituent accompanying the mesomerism. 1981 P. Sykes Guidebk. to Mechanism in Org. Chem. (ed. 5) x. 272 The mechanism..nicely illustrates the difference between tautomerism and mesomerism. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1928
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