Bathochromic shifts observed in the optical spectra of alkali picrates in tetrahydrofuran on addition of crown ethers and bis-(crown ethers) can be rationalized in terms of tight and loose ion pair-crown ether complexes.
K. H. Wong, M. Bourgoin and J. Smid, J. Chem. Soc., Chem. Commun., 1974, 715 DOI: 10.1039/C39740000715
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