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The ligand p-nitrocalix[8]arene, n-LH 8 , was synthesized and its acidity constants were determined at 25 o C inH 2 O 70 v/v by a potentiometric method: pK a1 < 0, pK a2 = 2.6 +/- 0.1, pK a3 = 7.2 +/- 0.2, pK a4 = 10.2 +/- 0.2, and pK a5-8 > 12. Upon reaction of n-LH 8 with lanthanide...
New cyclic and acyclic Schiff bases have been prepared by condensation reaction of 5,17-diamino-25,26,27,28-tetrapropoxycalix[4]arene (L B ) with 2,6-diformyl-4-chlorophenol and 1,5-diamino-3-aza(methyl) pentane or with 2,3-dihydroxybenzaldehyde. The related complexes containing d- or f-metal ions have been obtained by reaction of the preformed ligands with the appropriate metal salt or by...
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