pseudohalogenn.
/ˌs(j)uːdəʊˈhalədʒ(ə)n/, U.S. /ˌsudoʊˈhælədʒ(ə)n/ Chemistry.
Any of a group 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.
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pseudohalogen1925
the world > matter > chemistry > elements and compounds > metals > specific elements > halogens > [adjective] > pseudo-halogens
pseudohalogen1925
1925 Chem. Abstr. 19 1996 (heading) Pseudo halogens.
1932 Industr. & Engin. Chem. 24 109/1 Thiocyanogen in solution behaves very much like the halogens; in fact, it is sometimes called a pseudohalogen.
1954 R. 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.]
1962 F. A. Cotton & G. 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; (SeCN)2, selenocyanogen; and (SCSN3)2, azido-carbon disulfide.
1991 Jrnl. Medicinal Chem. 34 1468 Kanamycin B has been chemically modified..by substitution of the hydroxyl group with a halogen atom (or a pseudohalogen group).
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1925