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- W2033235886 abstract "Abstract The p -tert-butylsulfonylcalix[4]arene and sulfonylcalix[4]arene conformers have been obtained by AM1 geometry optimizations. The structural cavities of p -tert-butylsulfonylcalix[4]arene and sulfonylcalix[4]arene conformers of which phenol groups are bridged by sulfonyl sulfur have been compared to the calix[4]arene and thiacalix[4]arene. The conformational energies of p -tert-butylsulfonylcalix[4]arene have been compared with the energies of sulfonylcalix[4]arene, calix[4]arene and thiacalix[4]arene. The most stable conformer of sulfonylcalix[4]arene and p -tert-butylsulfonylcalix[4]arene are 1,2-alternate and 0011-AAAA 1,2-alternate conformers, respectively. Two different types of hydrogen bond presented in the sulfonylcalix[4]arene cone and partial cone conformers and p -tert-butylsulfonylcalix[4]arene cone conformer have been found. Ab initio energies of the AM1-optimized structures of sulfonylcalix[4]arene and p -tert-butylsulfonylcalix[4]arene conformers and their complexes with zinc(II) have been computed at HF/6-31G* and B3LYP/6-31G* theoretical levels. The optimized structure of complex species of p -tert-butylsulfonylcalix[4]arene with zinc(II) is in good agreement with recent X-ray geometry data." @default.
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- W2033235886 date "2003-07-01" @default.
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- W2033235886 title "Conformational and energetical structures of sulfonylcalix[4]arene, p-tert-butylsulfonylcalix[4]arene and their zinc complexes" @default.
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- W2033235886 doi "https://doi.org/10.1016/s0166-1280(03)00135-0" @default.
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