perosmaten.
/pəˈrɒzmeɪt/, U.S. /pəˈrɑzmeɪt/ Chemistry.
A salt containing the anion [OsO4(OH)2]2−, in which osmium has its highest oxidation state (8).The passage in ed. 7 of Bloxam's Chem. corresponding to quot. 1895 occurs as quot. 1890 at osmiate n.
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osmiate1844
perosmate1895
1895 J. M. Thomson & A. G. Bloxam Bloxam's Chem. (ed. 8) 470 By dissolving perosmic anhydride in potash, potassium perosmate is supposed to be formed, but this has not been isolated.
1949 Thorpe's Dict. Appl. Chem. (ed. 4) IX. 134/1 Addition of alcohol to the clear solution and washings precipitates the ruthenium..and reduces the perosmate to violet osmate.
1973 S. E. Livingstone in J. C. Bailar et al. Comprehensive Inorg. Chem. III. xliii. 1232 Potassium osmate K2[OsO2(OH)4]..is best prepared by reduction with alcohol of potassium perosmate K2[OsO4(OH)2].
1984 N. N. Greenwood & A. Earnshaw Chem. of Elements (1986) xxv. 1257 Dissolution of OsO4 in cold aqueous KOH produces deep-red crystals of K2[OsVIIIO4(OH)2] (‘perosmate’).
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1895