| 单词 | donor bond |
| 释义 | > as lemmasdonor bond 2. Chemistry and Physics. An atom, molecule, etc., that loses a constituent part to something else; esp. (a) an atom, etc., that gives up a valency electron pair to another atom, so forming a co-ordinate bond with it; (b) in a semiconductor, an impurity atom which has a higher valency than the majority of the atoms and can give up a valency electron to the conduction band of the crystal; donor bond, a chemical bond which can be regarded as having had some of its strength transferred to another atom. ΘΚΠ the world > matter > chemistry > atomic chemistry > [noun] > atoms > specific types of atoms functional group1892 species1895 hetero-atom1900 radio-atom1905 isobar1918 donor1927 impurity atom1939 nuclide1947 strong collider1968 1927 N. V. Sidgwick Electronic Theory of Valency vii. 116 When a co-ordinate link is formed between two atoms, one of them gives the other a share in two of its own (previously unshared) electrons... We may call the atom which lends the two electrons..the donor, and the one which receives them..the acceptor. 1946 Trans. Faraday Soc. 42 100 Here we have to consider both the electron work function of the donor and the electron affinity of the acceptor. 1952 C. A. Coulson Valence ix. 252 This shows that the central C-C bond is an acceptor, acquiring bond order at the expense of the two end donor bonds. 1964 Guirard & Snell in Florkin & Stotz Comprehensive Biochem. XV. v. 173 At the stage of purity studied, the transaminase has a rather broad specificity for both amino group donors and acceptors. 1966 Chem. in Brit. 2 164/2 For triplet energy transfer from donor to acceptor to occur, the donor triplet must lie close to, or above that, of, the acceptor. 1971 Sci. Amer. July 34/2 If there are more acceptors than donors, current is carried by holes (positively charged) and the material is designated a p-type semiconductor. < as lemmas |
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