• Bastida, Rufina
• Labisbal, Elena
• Núñez, Cristina
• Valencia, Laura
• Fernández-Lodeiro, A.
• Lodeiro, Carlos
• García, Verónica
• Liñares, Araceli
• Lamelas, Rodrigo

Abstract

<p>A trans-N,N′-methylated hexaazamacrocycle precursor L³, derived from the hexadentate polyamine macrocycle L (Py2[18]aneN6), was synthesized for the first time. The crystal structures of the intermediates L¹·8H₂O and L²I₂·H₂O showing two trans quaternary nitrogen atoms have also been determined by single-crystal X-ray crystallography. By the alkylation of the trans secondary amines present in L³, two novel macrocyclic molecular probes 1 and 2 linked to two nitrophenylurea and two nitrophenylthiourea groups, respectively, are reported. Crystals of 1·2CDCl₃ suitable for single-crystal X-ray diffraction analysis were also obtained. The coordination ability of compounds 1 and 2 toward hydrated nitrate salts of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) was studied. Their responses toward different anions (fluoride (F^-), chloride (Cl^-), bromide (Br^-), iodide (I^-), hydroxide (OH^-), acetate (AcO^-), cyanide (CN^-), dihydrogen phosphate (H₂PO₄^-), nitrate (NO₃^-) and perchlorate (ClO₄^-)) in DMSO solution were evaluated by UV-vis absorption spectroscopy. The immobilization of probe 1 in cellulose supported systems to evaluate its efficiency in the fast recognition of different anions (F^-, AcO^-, CN^-, H₂PO₄^-) in aqueous phase was also described.</p>

Topics

• compound
• nickel
• phase
• x-ray diffraction
• zinc
• Nitrogen
• copper
• cobalt
• cellulose
• amine
• spectroscopy
• Cadmium