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Possible Answers: PGDN.
Last seen on: –Newsday.com Crossword – Oct 11 2020
–LA Times Crossword 17 Dec 19, Tuesday
–The Washington Post Crossword – Jun 16 2019
–LA Times Crossword 16 Jun 19, Sunday
LA Times Crossword 23 Jul 2017, Sunday
Random information on the term “PGDN”:
Nitronous oxide
Nitroxyl (common name) or azanone (IUPAC name) is the chemical compound HNO. It is well known in the gas phase. In aqueous solution it acts as an acid with the conjugate base NO−, (pKa = 11.4). NO− is the reduced form of nitric oxide (NO) and is isoelectronic with dioxygen. Nitroxyl can be formed as a reaction intermediate. Dichloramine reacts with hydroxyl ion, which can be present in water or comes from water molecules, to yield nitroxyl radical and the chloride ion.
Nitroxyl is very reactive towards nucleophiles (especially thiols) and quickly dimerizes to hyponitrous acid, H2N2O2, which is then dehydrated to nitrous oxide N2O. Therefore, HNO is generally prepared in situ for example with the compounds such as Angeli’s salt (Na2N2O3) and Piloty’s acid (PhSO2NHOH) when it is needed. In biological samples, nitroxyl can be detected using fluorescent sensors, many of which are based on the reduction of Cu(II) to Cu(I) with concomitant increase in fluorescence.