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Photochemistry of Nitrous Acid and Nitrite Ion

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Photochemistry of Nitrous Acid and Nitrite Ion Illinois Wesleyan University Digital Commons @ IWU Honors Projects Chemistry 5-7-1992 Photochemistry of Nitrous Acid and Nitrite Ion Jane A. Johnson '92 Illinois Wesleyan University Follow this and additional works at: https://digitalcommons.iwu.edu/chem_honproj Part of the Chemistry Commons Recommended Citation Johnson '92, Jane A., "Photochemistry of Nitrous Acid and Nitrite Ion" (1992). Honors Projects. 23. https://digitalcommons.iwu.edu/chem_honproj/23 This Article is protected by copyright and/or related rights. It has been brought to you by Digital Commons @ IWU with permission from the rights-holder(s). You are free to use this material in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/ or on the work itself. This material has been accepted for inclusion by faculty at Illinois Wesleyan University. For more information, please contact [email protected]. ©Copyright is owned by the author of this document. • PHOTOCHEMISTRY OF NITROUS ACID AND NITRITE ION Jane A. Johnson Advisor: Timothy R. Rettich Chemistry 499 Thesis Illinois Wesleyan University May 7, 1992 • Approval Page "Photochemistry of Nitrous Acid and Nitrite Ion" by Jane A. Johnson A paper submitted in partial fulfillment of the requirements for Chemistry 499 and Honors in Chemistry Approved, Honors Committee: o;~ai Q(J4 Dr. T~ R. Rettich-,--R-e-s-e-a-r-c-h--A-dvisor ~u~/' ~!CIf;g~·"'5eL-y--------- Illinois Wesleyan University 1992 i • INDEX List of Figures 111 List of Tables ............................................... .. iv Abstract 1 Introduction ................................................... 2 Thermal reactions of nitrous acid ...................... 2 Photochemical reactions of nitrous acid 4 Reactions of nitrite ion 6 Scavenging of hydroxyl radicals ................................ 9 Thermal nitrosation of phenol 14 Experimental 15 Apparatus 15 Chemicals 15 Photochemical reactions of HONO and NOz- 15 Photochemical reaction of HONO in benzene 16 Photochemical reaction of NO z- in DMF 16 Photochemical reaction of NO z- in DMSO 17 Thermal decomposition of HONO in benzene 17 Determination of partition coefficient of HONO . .. 17 Thermal reaction of NO z- and phenol ........................ .. 18 Nitrogen and oxygen saturated NO z- solutions .................... 18 Solubility of NOz(g) in benzene 19 Results 20 Actinometry ............................................. 21 Aqueous nitrous acid .................................. 22 Aqueous sodium nitrite '. 26 HONO in benzene ........................................ 32 Nitrite in DMF, DMSO 39 Intensity study 45 Discussion 52 Future Research 63 References ................................................... 65 11 • LIST OF FIGURES 1. Aqueous HONO, before photolysis 22 2. Aqueous HONO, after photolysis 23 3. Determination of <I>(PNP) from HONO (aq) 25 4. Aqueous NO;, before photolysis 26 5. Aqueous NO z' ,after photolysis 27 6. Determination of <I>(PNP) from 0.06M NO z' (aq) ..................... 29 7. Determination of <I>(PNP) from 0.15M NO z' (aq) 31 8. HONO in benzene, before photolysis 32 9. HONO in benzene, after photolysis 33 10. Thermal Decomposition of HONO in benzene 34 11. Thermal Decomposition of HONO in benzene at 386nm 37 12. Second order rate law for decomposition of HONO in benzene .............................................. 38 13. Nitrite in DMF 39 14. Nitrite in DMSO 40 15. Determination of <I>(nitrite) from NO z' in DMSO 43 16. Oxygen and nitrogen saturated nitrite reactions 44 17. Phenol in water and benzene 46 18. Phenol in DMSO 47 19. Aqueous p-nitrosophenol 48 20. Aqueous PNP, made thermally 49 21. PNP in benzene 50 22. NOzCg) in benzene 51 111 • LIST OF TABLES 1. Extinction coefficients ......................................... 20 2. Photolysis of actinometer 21 3. Determination of incident intensity 21 4. Determination of <t> (PNP) from HONO (aq) 24 5. Photolysis of 0.06M NOz- (aq) with benzene scavenger 28 6. Determination of <t> (PNP) from 0.06M NOz- (aq) 28 7. Photolysis of 0.15M NOz- (aq) with benzene scavenger 30 8. Determination of <t> (PNP) from 0.15M NOz- (aq) 30 9. Thermal decomposition of HONO in benzene 35 10. Graph values for HONO in benzene 36 11. Photochemical decomposition of NOz- in DMSO 41 12. Determination of <t> (Phenol) from photochemical decomposition of NOz- in DMSO 42 13. Intensity dependence of aqueous nitrite reaction 45 14. Determination of <t> (PNP) from NOz- (aq) at varying intensities ....................................... 45 IV • ABSTRACT A study of the solution phase photochemistry of the nitrous acid/nitrite ion system in both water and non-aqueous solvents has been undertaken. Photolysis at 366nm of the aqueous system is known to form hydroxyl radical and nitric oxide. The relative contributions of the molecular and ionic forms to the photochemical production of radicals is unknown. Scavenging reactions of the hydroxyl radicals in aqueous and nonaqueous solution are used to determine the relative production of OH. formed by photolysis of HONO and N02-. Molecular nitrous acid is isolated from its conjugate base by extraction into benzene from water. The thermal decomposition of HONO in the extraction mixture was measured and it was found to be second order with respect to nitrous acid. The product of the photolysis of this benzene solution, PNP, indicates hydroxyl radical formation. Nitrite ion dissolves in aprotic solvents, such as DMF and DMSO, without the formation of nitrous acid. Photolysis of these solutions appears to result in the formation of phenol only. The quantum yield for the formation of phenol was determined to be 1.8 ± 0.3 x 10-2 molleins. 1 • INTRODUCTION AND THEORY The chemistry of nitrous acid has been of interest in the last decade due to its role in atmospheric pollution. Various nitrogen oxides cause the formation of secondary photooxidants such as ozone, hydroxyl radical and hydrogen peroxide. Because it efficiently absorbs long wavelength ultraviolet light, nitrous acid is an important source of atmospheric hydroxyl radical.! Nitrous acid in the gas phase has been determined to buildup during the night, and may be an important source of early morning hydroxyl radical which can initiate photochemical reactions.2 The gas phase reactions of nitrous acid have been extensively explored, but there have been only a few studies of the chemistry of nitrous acid in water and none in other liquid media. Thermal reactions of nitrous acid: The gas phase reaction of nitrous acid was determined by Cox and Atkins in 1973. Nitrous acid is in equilibrium with nitric oxide and nitrogen dioxide? ' NO(g) +N02 (g) +H2 C>o*2HONO(g) (1) In aqueous solutions there are two accepted equilibria: the acid dissociation reaction, (2) HONO(aq) +H2 C>o*H3 0+ (aq) +NO; (aq) and the dehydration reaction, (3) 4 Another reaction which has been extensively studied is : 2 • 3HONO (aq) "2NO (aq) +H)O+ (aq) +NO; (aq) (4) Reactions 2 and 3 are rapidly established equilibria; decomposition by the reaction 4 has a half-life of about 14 hours at O°c. Consequently the thermal reaction is a significant pathway for the destruction of nitrous acid and must be accounted for in the photochemical reactions. The stoichiometry and kinetic order of reaction 3 with respect to nitrous acid was first determined by Montemartini in 1890.5 He found first order kinetics at low nitrous acid concentrations and two and one-half order kinetics at higher concentrations. Montemartini's results at low concentrations have been confirmed 4 by later studies. ,6,7 The higher concentration kinetics however have not been 6 consistently reproduced and orders of 2.5, 3, 3.5 and 4 have been determined. ,7,8 In 1928, Abel and Schmid reported two possible mechanisms for the thermal decomposition of nitrous acid in the higher concentration region.8 These mechanisms are: and (7) (8) 3 • (9) (10) Another possible mechanism was reported by Thie in 1947:9 2 HONO (aq) "'NO(aq) +N02 (aq) +H2 0 (11) (12) (13) In all three of the mechanisms the final step is the hydrolysis of dinitrogen 6 7 tetroxide. Later studies of nitrous acid by Usubillaga , Rettich , and Park and Lee2 do not distinguish among these three mechanisms. Photochemical reactions of HONO: The gas phase photochemical reactions of nitrous acid at 330-380nm were first investigated by Cox and Atkins in 1973.3 Based on their results they proposed two primary photodissociations: HONO(g)+hv ...NO(g)+OH(g) (14) HONO(g) +hv"'H(g) +N02 (g) (15) They showed that the total primary quantum yield for these two reactions is near unity. Also they estimated that the quantum yield for reaction 14 is about twice that for reaction 15. CoxtO suggested a mechanism based on this evidence. 4 HONO(g)+hv~NO(g)+OH(g) (16) OH(g)+NO(g)+~HONO(g)+M (17) OH(g) +N02(g) +~HN03 (g) +M (18) OH(g) +HONO(g) ~H20+N02 (g) (19) Additional studies by Cox have led to the estimate that reaction 15 contributes less than 10% to the overall reaction and that the primary quantum yield for reaction 14 is 0.92+0.16. In another study of the gas phase photolysis, Nash proposed a mechanism based solely upon reaction 14 as the initial step.ll HONO(g)+hv~H(g)+NO(g) (20) (21) Although other studies have been done on the gas phase photochemistry of nitrous acid, no other mechanisms have been proposed. The first report of the aqueous photochemistry of nitrous acid was by Murty and Dhar in 1930.12 They photolyzed solutions at wavelengths above 445nm, and reported quantum yields of up to 15 for the reaction. These wavelengths are in a region where nitrous acid does not appreciably absorb light; nitrous acid absorbs light from about 400-300nm. It was suggested by Rettich7 that this decomposition was probably due to a thermal reaction caused by the heating of the solution by the light source.
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