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A p-tert-butylcalix[6]arene bearing phosphinoyl pendant arms for the complexation and sensitisation of lanthanide ions
2002
Journal of the Chemical Society. Dalton Transactions
The new lower rim functionalised macrocycle 5,11,17,23,29,35-hexa-tert-butyl-37,38,39,40,41,42hexakis(dimethylphosphinoylmethoxy)calix[6]arene (B 6 bL 6 ) has been synthesised. Temperature dependent 1 H and 31 P NMR studies indicate a mixture of conformers with a time-averaged C 6v symmetry at 405 K in dmso-d 6 ; ∆G ≠ values for conformational interconversion processes are equal to 68(1) and 75(2) kJ mol Ϫ1 and reveal a semi-flexible macrocycle with alternate in-out cone conformation, a fact
doi:10.1039/b206238k
fatcat:qzf6wubglfctpalqg63jm6eqam