Abstract
Organotetrasilanols 6a–6c based on calix[4]arene were synthesized from cone- and 1,3-alternate calix[4]arene tetrapropyl ether 3a and 3b following a modified literature method. X-ray analyses of the tetrasilanols revealed flattened cone- and 1,3-alternate conformational structures 6a, 6b and 6c respectively. Hydrogen-bonded water clusters are included in the crystal lattice and cavity of the cone tetrasilanols 6a and 6b. In solution, the binding structures of the cone tetrasilanols 6a and 6b for chloride ion are estimated by 1H NMR to be larger than that of 1,3-alternate 6c due to its circular hydrogen bonding.
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