A study of the reactions of H3O+, NO+ and O2+ ions with nine alkoxy alcohols.
Following a selected ion flow tube mass spectrometry (SIFT-MS), analysis of the headspace of a commercial available nail polish remover pad in which gamma-butyrolactone (GBL) and 2-butoxy-1-ethanol were found to be the major volatiles, a study of the reactions of H3O+, NO+ and O2+* ions with nine alkoxy alcohols (R1-O-R2OH) was carried out using selected ion flow tube (SIFT) at a carrier gas (helium) pressure of 9. 3 x 10(1) Pa. Experiments were also performed at various carrier gas pressures (4 x 10(1)-1.1 x 10(2) Pa) for some reactions and under moist air condition. The number and distribution of the hydrates for the product ions were used to identify their structures and to investigate reaction mechanisms. The H3O+ reactions proceed via nascent ion-molecule complex (H3O+ .M)*, then produce R1-O-R2OH. H+, ( R1-O-R2)+, HOR2OH. H+ and R2=O. H+ ions through various channels. Similarly, via a nascent complex (NO+.M)*, NO+. M, (M-H)+ and (M-ROH)+ ions were produced in the NO+ reactions. The collisions between the nascent complexes (H3O+ .M)* and (NO+.M)* with a third body (He, N2 and O2 etc) have influence on the product ion distributions. The O2+ reactions produce mainly dissociative product ions and it is uncertain whether they proceed via the nascent ion-molecule complex (O2+ . M)*. This study provides rate coefficients and product ions in the SIFT-MS database for the analysis of these compounds in normal and humid air samples. It will be further utilised into addiction and drug abuse, respiratory medicine and other research areas using SIFT-MS.
Wang
Tianshu
T
Institute of Science and Technology in Medicine, Medical School, Keele University, Stoke-on-Trent, UK.
D000393:Air Pollutants / Q000032:analysis; D000438:Alcohols / Q000737:chemistry*; D003358:Cosmetics / Q000737:chemistry; D007477:Ions / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D009861:Onium Compounds / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000737:chemistry*
D000393:Air Pollutants; D000438:Alcohols; D003358:Cosmetics; D007477:Ions; D009861:Onium Compounds; D055549:Volatile Organic Compounds; D009569:Nitric Oxide; C027727:hydronium ion; D010100:Oxygen