platini-comb. form
Chemistry.
Forming names of chemical compounds containing platinum, esp. in the tetravalent (platinic) state. Cf. platino- comb. form.† platinammonium n. Obsolete a hypothetical ion consisting of an amide of tetravalent platinum, now known to be an ammine group occurring in platinum complexes.
platinamine n. disused a hypothetical amide of tetravalent platinum thought to occur in salts, now known to be an ammine group occurring in platinum complexes; any ammine of platinum.
ΚΠ
1856 W. A. Miller Elements Chem. II. 1066 Salts of Platinamine.
1864 Proc. Royal Soc. 1863–4 13 307 The formula..is that of the bihydrochlorate of platino-lutidine, if regarded as analogous to the so-called bihydrochlorate of platinamine.
1907 G. S. Newth Text-bk. Inorg. Chem. (ed. 12) iii. xiv. 695 (heading) Ammoniacal platinum bases, or platinamines.
ΚΠ
1873 H. Watts Fownes's Man. Elem. Chem. (ed. 11) ii. 349 Platinum tetrachloride..absorbs four molecules of ammonia, forming platinammonium chloride.
platinichloric adj. 
/ˌplatᵻnᵻˈklɒrɪk/, /ˌplatn̩ᵻˈklɔːrɪk/, /ˌplatn̩ᵻˈklɒrɪk/,
Brit. /ˌplatᵻnᵻˈklɔːrɪk/
, /ˌplatᵻnᵻˈklɔːrɪk//ˌplatᵻnᵻˈklɒrɪk//ˌplatn̩ᵻˈklɔːrɪk//ˌplatn̩ᵻˈklɒrɪk/U.S. /ˌplætn̩əˈklɔrɪk/
platinichloric acid n., an acid, H2PtCl6, formed when platinum is dissolved in aqua regia; chloroplatinic acid./ˌplætn̩əˈklɔrɪk/ΚΠ
1890 Webster's Internat. Dict. Eng. Lang. (at cited word) Platinichloric, or chloroplatinic, acid.
1950 N. V. Sidgwick Chem. Elements II. 1580 Roger Adams and his co-workers find an oxide of the composition PtO2, H2O, made from platinichloric acid by fusion with potassium nitrate, to be even more effective.
1958 Van Nostrand's Sci. Encycl. (ed. 3) 1274 Platinum..is attacked by aqua regia, forming chloroplatinic (platinichloric) acid.
platinichloride n. /ˌplatn̩ᵻˈklɔːrʌɪd/,
Brit. /ˌplatᵻnᵻˈklɔːrʌɪd/
, /ˌplatᵻnᵻˈklɔːrʌɪd//ˌplatn̩ᵻˈklɔːrʌɪd/U.S. /ˌplætn̩əˈklɔˌraɪd/
a salt containing the anion [PtCl6]2−; = chloroplatinate n. at chloro- comb. form2 2./ˌplætn̩əˈklɔˌraɪd/ΚΠ
1887 A. M. Brown Treat. Animal Alkaloids ii. i. 73 Chloride of platinum gives with chlorohydrate of betaine a platinichloride in yellow crystals.
1938 R. Hum Chem. for Engin. Students xxii. 601 The potassium is estimated, as platinichloride, by adding chloroplatinic acid..removing the sodium compound with methyl alcohol, drying and weighing.
1955 B. C. L. Kemp Elem. Org. Chem. (new ed.) xii. 175 Since the platini-chloride on ignition leaves a residue of platinum which can be weighed.., these salts are used in organic analysis to determine the molecular weights of the amines from which they are derived.
1983 Jrnl. Org. Chem. 48 4018 Coppola first reported in 1885 the platinichloride that he obtained from 1-(2-iodoethyl)-pyridinium iodide and silver oxide.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
<
comb. form1856