F. Ugozzoli

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Phosphonate cavitands are an emerging class of synthetic receptors for supramolecular sensing. The molecular recognition properties of the third-generation tetraphosphonate cavitands toward alcohols and water at the gas-solid interface have been evaluated by means of three complementary techniques and compared to those of the parent mono- and diphosphonate(More)
The synthesis and characterization of alpha-[Ru(azpy)2(NO3)2], 1, are reported (azpy is 2-(phenylazo)pyridine; alpha indicates the isomer in which the coordinating pairs ONO2, N(py), and N(azo) are cis, trans, and cis, respectively). The solid-state structure of 1 has been determined by X-ray crystallography. Crystal data: orthorhombic a = 15.423(5) A, b =(More)
Guest-switchable crystals: A solid-state guest exchange of the tetraphosphonate cavitand Tiiii[H,CH(3),Ph] as host promotes single-crystal-to-single-crystal transformations (see graphic). The strong preference for methanol over water is observed in all three phases (gas, liquid, solid), thus demonstrating the fundamental role played by the preorganized(More)
We describe an innovative approach to the generation of tetrameric water clusters in the solid state. The specific H-bond pattern induced by the tetraphosphonate cavitand template via its rigidly preorganized P=O acceptor groups leads to the exclusive formation of the unique cyclic homodromic water tetramer of C(4) symmetry.
Rigid calix[4]arene cone conformers, which are efficient receptors for quaternary ammonium salts, are usually obtained through the functionalization of their lower rim with suitable groups. Using flexible cone conformer of calix[4]arene, bearing four 4-hydroxybenzyl groups as cooperative and rigidifying structural elements at the upper rim of the calix,(More)
The effect of a systematic variation of the basicity of the pyridine nitrogen atom in calix[6]arene-based picolinamide ligands on the actinide(III)/lanthanide(III) separation by solvent extraction has been investigated. The distribution coefficients for trivalent metal ions (D(M)) decrease by increasing the nitric acid concentration, but for ligands (2 and(More)
An imidazo[1,5-a]pyridine derivative was unexpectedly obtained through the action of Fe2+ on a dynamic library of imines generated in situ via condensation of benzaldehyde and 2-picolylamine. The reaction product was easily isolated as the only nitrogen-containing product eluted from the chromatographic column. A reaction mechanism is proposed, in which(More)