0000000000182264

AUTHOR

Chiara Pasquini

showing 3 related works from this author

Aromatic Bridged Bis-phenol A Derived Cyclophanes. Synthesis, Molecular Structure and Binding Properties Toward Quats

2003

Three novel polyoxyethylene bridged bis phenol A derived cyclophanes, {\rm 2 -- 4,} with additional aromatic units in the bridge to increase the number of cation–π interactions with guest cations, were synthesized and characterized by means of X-ray crystal structure determinations. The binding properties of these receptors toward tetramethylammonium (TMA), N-methylpyridinium (NMP), acetylcholine (ACh) and N-methylquinolinium (NMQ) salts were evaluated by means of 1H NMR spectroscopy and compared with those of the previously reported receptor 1.

Tetramethylammonium1h nmr spectroscopychemistry.chemical_compoundMolecular recognitionchemistryStereochemistryBinding propertiesSupramolecular chemistryPhenolMoleculeGeneral ChemistryCrystal structureMedicinal chemistrySupramolecular Chemistry
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Zinc-salophen complexes as selective receptors for tertiary amines

2007

Zinc-salophen compounds 1-3 incorporating in the given order 1,2-diaminobenzene, 2,3-diaminonaphthalene, and 9,10-diaminophenantrene moieties were synthesised. Their binding properties toward a series of tertiary amines were assessed by UV-Vis and fluorescence spectroscopy in chloroform solution. Unprecedented selectivities of quinuclidine vs. triethylamine higher than 105 were recorded, thereby revealing the dramatic influence of steric effects on axial coordination of tertiary amines. X-Ray diffraction analyses showed that in the solid state compound 2 is dimeric, but its 1 : 1 quinuclidine complex is monomeric. Strong indications were obtained that both free receptors and their amine add…

Steric effectsChloroformGeneral ChemistryCatalysisFluorescence spectroscopyAdductchemistry.chemical_compoundMonomerchemistryPolymer chemistryMaterials ChemistryOrganic chemistryAmine gas treatingTriethylamineQuinuclidine
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Ion-Pairing Effects in the Self-Assembly of a Fluorescent Pseudorotaxane

2006

Herein we report on the self-assembly, in a low polarity solvent, of a pseudorotaxane species comprising binaphthyl-26-crown-8 (BN26C8) as the macrocyclic host and anthracenyl-benzylammonium as the threadlike positively charged guest (ABH+). Absorption and luminescence data reveal a very efficient energy transfer process occurring from the binaphthyl to the anthracene singlet excited states. The self-assembly is highly dependent on the nature of the counteranion confirming the crucial role played by it in the competition between the self-assembly process and the formation of ion pairs (ABH+X-). This behavior can be readily evidenced in dilute solutions from the analysis of the luminescence …

AnthraceneIon pairsRotaxanesPhotochemistryStereochemistryOrganic ChemistrySupramolecular chemistrySelf-assemblychemistry.chemical_compoundCrystallographyTRISPHATMolecular recognitionchemistryHexafluorophosphateddc:540Proton NMRSinglet stateMolecular recognitionPhysical and Theoretical ChemistryLuminescenceEuropean Journal of Organic Chemistry
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