PREPARATION AND CHARACTERIZATION OF A TRIOXOFLUOROCHROMATE(VI) AND A TRICHROMATE(VI) OF 2-METHYLQUINOLINIUM

The compounds (BH) (CrO3F) (I) and (BH)(2) (Cr3O10) (II), where B=2-me thylquinoline, have been synthesized. Compound (I) was prepared by rea ction between chromium (VI) trioxide, hydrogen fluoride and organic ba se in aqueous medium. Compound (II) was also synthesized in aqueous me dium from (I) and chromium (VI) trioxide. Compounds (I) and (II) have been characterized by elemental analysis, infrared and electronic spec tra. The molecular structure of compound (II) was determined by X-ray crystallography and showed that the C10H9NH+ organic cations are bound to Cr3O102- anions by significant C-H...O hydrogen-bonding interactio n. The trichromate ion consists of three nearly tetrahedral CrO4 group s joined through shared oxygen atoms. The conformation of the Cr3O102- . anion is different from that of the same anion in Rb2Cr3O10 and dipy razinium trichromate.