title: Aluminum-27 NMR studies of alcoholic (2-hydroxyethyl)trimethylammonium aluminate solutions.
abstract: (27)Al NMR spectroscopy is a power tool for investigation of the aluminate species existing in both aqueous and non-aqueous solutions. Aluminum-27 nuclear magnetic resonance (NMR) spectroscopy also can be used to determine thermodynamic properties of complexes in the solution. In this report, (27)Al NMR spectroscopy was used to characterize species present in alkaline alcoholic aluminate solutions. (2-Hydroxyethyl)trimethylammonium (2-EHTMA) hydroxide was used as base. In solution of CH(3)OH and H(2)O in a mole ratio of 64:1 it was possible to detect five signals by aluminum-27 NMR, indicating formation of [Al(OH)(4-n)(CH(3)OH)(n)]((n-1)+) (n=0,1, 2, 3 and 4) species. Aluminum-27 NMR spectroscopy has also used for investigation of the species present in the ethanolic 2-HETMA aluminate solutions. The equilibrium constants for the formation of aluminate complexes were also determined for both methanolic and ethanolic aluminate solutions. Aluminum-27 NMR spectra of propanolic and butanolic 2-HETMA aluminate solutions were also studied.
authors: Department of Chemistry, Faculty of Basic Science, Mazandaran University, Babolsar, Iran. samadi@umz.ac.ir <samadi@umz.ac.ir>
authors: Abdolraouf
authors: A
authors: Samadi-Maybodi
authors: Nasser
authors: N
authors: Goudarzi
mesh_terms: D000433:1-Propanol / Q000737:chemistry; D000438:Alcohols / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry*; D000440:Butanols / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods; D002794:Choline / Q000031:analogs & derivatives* / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D006878:Hydroxides / Q000737:chemistry; D007477:Ions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D000432:Methanol / Q000737:chemistry; D008956:Models, Chemical; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: C517286:(2-hydroxyethyl)trimethylammonium aluminate; D000438:Alcohols; D000440:Butanols; D006878:Hydroxides; D007477:Ions; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D014867:Water; D000431:Ethanol; D000433:1-Propanol; D000535:Aluminum; D002794:Choline; D000432:Methanol