Dication ethers. Part 8. The X-ray crystal structures of 9,9′-oxybis-(10-methylacridinium) bis(tetrafluoroborate) and the neutral ether 9,9′-oxybisacridine

Abstract

The X-ray crystal structures of 9,9′-oxybis-(10-methylacridinium) bis(tetrafluoroborate)(3) and 9,9′-oxybisacridine (4) have been determined. Both compounds have twist conformations around the ether structural fragment. The angles between the acridine rings and the C–O–C plane are 46.3, 46.3° in (3) and 57.4, 51.1° in (4). The most significant difference between (3) and (4) is the shortening of the ether bond by ca. 0.06 Å; in the dication ether (3).