Tunable Zn2+ and Cu2+ calixarene complexes as polytopic building blocks for guest recognition

Autor:	Francesca Nicoletta, Valeria Zito, Carmela Bonaccorso, Carmelo Sgarlata, Domenico Sciotto, Giuseppe Arena
Rok vydání:	2013
Předmět:	calixarenes Absorption spectroscopy Stereochemistry Chemistry Ligand Metal ions in aqueous solution Cu2+ guest binding Zn2+ metal complexes General Chemistry Binding constant polytopic receptors Metal Crystallography chemistry.chemical_compound visual_art Calixarene visual_art.visual_art_medium Proton NMR Acetonitrile
Zdroj:	Supramolecular chemistry 25 (2013): 615–625. doi:10.1080/10610278.2013.824083 info:cnr-pdr/source/autori:Carmela Bonaccorso,Francesca Nicoletta, Valeria Zito,Giuseppe Arena, Domenico Sciotto& Carmelo Sgarlata/titolo:Tunable Zn2+ and Cu2+ calixarene complexes as polytopic building blocks for guest recognition/doi:10.1080%2F10610278.2013.824083/rivista:Supramolecular chemistry (Print)/anno:2013/pagina_da:615/pagina_a:625/intervallo_pagine:615–625/volume:25
ISSN:	1029-0478 1061-0278
DOI:	10.1080/10610278.2013.824083
Popis:	Two calix[4]arene receptors containing two or four 3-pyridylmethyl pendants at the lower rim and fixed in the cone conformation have been synthesised. Their complexes with Cu2+ and Zn2+ have been studied via UV-vis absorption spectroscopy in acetonitrile; 1H NMR spectra provide further insights into the binding sites and show that the macrocycles suitably arrange their structure to meet the coordination features of the metal ion. Both ligands form with both Cu2+ and Zn2+ multiple complex species with large stability. The large binding constant values allow to drive the system to the formation of the desired species by appropriately selecting the metal/ligand ratio. The host-guest binding properties of N-methylpyridinium (NMPy) with both the free ligands and their metal complexes have been investigated by 1H NMR spectroscopy in CDCl3/CD3CN (9:1, v/v). The metal ions do not negatively affect the affinity of the calixarenes for NMPy and also allow for the formation of systems with multiple cavities available for guest inclusion, thus paving the way to new heteroditopic receptors for molecular recognition in solution.
Databáze:	OpenAIRE
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