The 121Sb Mössbauer 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 SbIII 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)Å.
M. Takahashi, T. Kitazawa and M. Takeda, J. Chem. Soc., Chem. Commun., 1993, 1779 DOI: 10.1039/C39930001779
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