title: Taming the oxidative power of SeO(3) in 1,4-dioxane, isolation of two new isomers of mixed-valence selenium oxides, and two unprecedented cyclic esters of selenic acid.
abstract: The reaction of (SeO3)4 with 1,4-dioxane (diox, dioxane) with or without diluting solvent led to the isolation of the unprecedented esters of selenic acid-1,2-ethyl selenate (CH2O)2SeO2 and the glyoxal diselenate O2Se[(OCHO)2]SeO2. It was possible to isolate an unknown dimeric form of Se2O5 (Se4O10·(diox)2) and a geometrical isomer of the mixed-valence oxide trans-Se3O7, both stabilized by dioxane. The dioxane adduct of monomeric selenium trioxide SeO3·diox was obtained from the reaction of (SeO3)4 with dioxane in liquid SO2. The reaction mechanism for the formation of these compounds was elucidated, and the molecular structure of the unstable form of the selenium trioxide was determined, consisting in a trimeric arrangement (SeO3)3.
authors.affiliation: Institute of Materials Chemistry, Faculty of Chemistry, Brno University of Technology , Purkynova 118, 612 00 Brno, Czech Republic.
authors.forename: Lukas
authors.initials: L
authors.lastname: Richtera
authors.forename: Vojtech
authors.initials: V
authors.lastname: Jancik
authors.forename: Diego
authors.initials: D
authors.lastname: Martínez-Otero
authors.forename: Ales
authors.initials: A
authors.lastname: Pokluda
authors.forename: Zdirad
authors.initials: Z
authors.lastname: Zak
authors.forename: Jan
authors.initials: J
authors.lastname: Taraba
authors.forename: Jiri
authors.initials: J
authors.lastname: Touzin
mesh_terms: D003500:Cyclization; D004146:Dioxanes / Q000737:chemistry*; D004952:Esters / Q000737:chemistry*; D007536:Isomerism; D008958:Models, Molecular; D010084:Oxidation-Reduction; D064586:Selenic Acid / Q000737:chemistry*; D064588:Selenium Oxides / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry
chemical_list: D004146:Dioxanes; D004952:Esters; D064588:Selenium Oxides; D013458:Sulfur Dioxide; D064586:Selenic Acid; C025223:1,4-dioxane