Crown ether complexes of BiIII. Synthesis and crystal and molecular structures of BiCl3·12-crown-4 and 2BiCl3·18-crown-6

Abstract

Crown ether complexes of bismuth(III) chloride of the types BiCl₃·12-crown-4 (1), 2BiCl₃·18-crown-6 (2), and BiCl₃·15-crown-5 (3) have been prepared; compound (1), and probably compound (3), is a neutral adduct with the pyramidal BiCl₃ linked to all four (five) oxygen atoms of the crown in a half-sandwich structure while compound (2) has the ionic formulation 2[BiCl₂·18-crown-6]⁺[Bi₂Cl₈]^2–, in which the bismuth cation is eight-co-ordinate involving all six oxygen atoms of the crown and two chlorine atoms in bicapped trigonal prismatic geometry.