| 释义 |
pseudoˈhalogen Chem.
Also with hyphen.
[a. G. pseudohalogen (Birckenbach & Kellermann 1925, in Ber. d. Deut. Chem. Ges. LVIII. 786): see pseudo- and halogen.]
Any of a class of compounds (in some cases hypothetical) which have small molecules built up from atoms of electronegative elements and which closely resemble the halogens in many respects.
1925Chem. Abstr. XIX. 1996 (heading) Pseudo halogens. 1954R. C. Brasted in M. C. Sneed et al. Comprehensive Inorg. Chem. III. ix. 223 The similarities between the pseudohalogens and the halogens are as follows: 1. They are in general fairly volatile. 2. They show affinity for metals, with which they combine directly to form salts. 3. The silver, lead, and mercury (I) salts are insoluble in water. [Etc.] 1962Cotton & Wilkinson Adv. Inorg. Chem. xxii. 465 The most important pseudohalogens are (CN)2, cyanogen; (OCN)2, oxycyanogen (existence in free state uncertain); (SCN)2, thiocyanogen; Se(CN)2, selenocyanogen; and (SCSN3)2, azido-carbon disulfide. 1965Phillips & Williams Inorg. Chem. I. xii. 467 All the pseudo-halogen anions enter into simple acid-base reactions with the proton in aqueous solution.
Hence pseudoˈhalide [halide], a compound, ion, or radical formed by a pseudohalogen.
1925Chem. Abstr. XIX. 1996 An attempt was made to prep. (SeCN)2, (CNO)2 and (TeCN)2 by electrolysis of K pseudo halides in alc. solns. 1965Phillips & Williams Inorg. Chem. I. xii. 467 The difference between the two series of anions, halides and pseudo-halides, lies in the unsaturation of a pseudo-halide which is most marked in CN-. The unsaturation places the pseudo-halides high relative to the halides in the spectrochemical series. 1967New Scientist 28 Dec. 766/1 A novel method of making carbonyl pseudohalides by simple substitution. In this way they could obtain from potassium cyanide the pseudohalide carbonyl cyanide. |