2024-03-132024-03-132022-08-23A Rearrangement Reaction to Yield a NH4+ Ion Driven by Polyoxometalate Formation N. Tanmaya Kumar, Shivaiah Vaddypally, and Samar K. Das ACS Omega 2022 7 (35), 31474-31481. DOI: 10.1021/acsomega.2c040152470-1343http://hdl.handle.net/20.500.12613/9888Triethylamine is a volatile liquid and exists in the atmosphere in the gas phase. It is a hazardous air pollutant and identified as a toxic air contaminant. Thus, producing ammonia (a vital chemical for fertilizer production) from the vapor state of this toxic substance is a challenging task. Diffusion of the vapor of triethylamine, (C2H5)3N, into an acidified aqueous solution of sodium molybdate results in the formation of single crystals of compound [(C2H5)3NH]2[(C2H5)4N][NaMo8O26] (1). Notably, compound 1 includes a [(C2H5)4N]+ cation, even though the concerned reaction mixture was not treated with any tetraethylammonium salt. The formation of the [(C2H5)4N]+ cation from (C2H5)3N in an acidic aqueous medium is logically possible only when an ammonium cation (NH4+) is formed in the overall reaction: 4(C2H5)3N + 4H+ = 3[(C2H5)4N]+ + [NH4]+. Although the resulting NH4+ cation (identified by Nessler’s reagent test) is not included in the crystals of compound 1 as a cation, it can be made associated with a crown ether in the isolation of single crystals of compound [NH4⊂B15C5]3[PMo12O40]·B15C5 (2), (B15C5 = benzo-15-crown-5). Crystal structure analysis and 1H NMR studies of compound 2 have established the presence of an H-bonded NH4+ ion in compound 2, thereby established the rearrangement reaction.8 pagesengAttribution-NonCommercial-NoDerivs CC BY-NC-NDhttps://creativecommons.org/licenses/by-nc-nd/4.0/Text