Collect. Czech. Chem. Commun. 1994, 59, 582-588

Examination of the Conditions of Extraction of Toxic Organic Bases and of Methods of Their Determination. III. Extraction of Ion-Associates of Dibenz[b,f]-1,4-oxazepin

Jan Součeka, Ladislav Belickýa and Josef Havelb

a Department of Chemistry, The Military College of Ground Forces, 682 03 Vyškov, Czech Republic
b Department of Analytical Chemistry, Masaryk University, 600 00 Brno, Czech Republic


The protonation and distribution constants of dibenz[b, f]-1,4-oxazepin (CR) were measured. This substance forms stable ion-associates with Acid Red 88, extractable into chloroform. Reextraction with an aqueous phase containing basic fuchsine or safranine T brings about exchange of the CR cation for the basic dye cation. The associates so formed exhibit higher conditional extraction constants and higher molar absorptivities than the initial associates.