M. Takahashi et al., SB-121 MOSSBAUER-SPECTRA FOR CROWN-ETHER ADDUCTS OF ANTIMONY(III) CHLORIDE AND MOLECULAR-STRUCTURE OF SBCL3.12-CROWN-4, Journal of the Chemical Society, Chemical Communications, (23), 1993, pp. 1779-1781
The Sb-121 Mossbauer spectra for the crown ether (12-crown-4,15-crown-
5 and 18-crown-6) adducts of antimony(III) chloride at 20 K show that
the stereochemical activity of the lone pair of the Sb(III) atom varys
with the antimony-crown ether interaction, which is strongest in the
12-crown-4 adduct having the shortest average Sb-O distance of 2.81(7)
angstrom.