Azonia spiro polyaza macrocycles containing biphenyl subunits as anion and cation receptors
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Scholar |
Altres documents de l'autoria: Burguete, M. Isabel; Clares, M. Paz; García España, Enrique; Luis, Santiago V.; Querol, Manel; Martí-Centelles, Vicente
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
comunitat-uji-handle4:
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http://dx.doi.org/10.1016/j.tet.2011.04.071 |
Metadades
Títol
Azonia spiro polyaza macrocycles containing biphenyl subunits as anion and cation receptorsAutoria
Data de publicació
2011-06-24Editor
ElsevierISSN
0040-4020Cita bibliogràfica
Tetrahedron (2011), vol. 67, no. 25, p. 4655–4663Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://www.sciencedirect.com/science/article/pii/S004040201100593XParaules clau / Matèries
Resum
The reaction of N-Boc triprotected cyclam with bis(chloromethyl)biphenyl followed by the corresponding deprotection of the nitrogen atoms allows the preparation of receptor 3 containing an azonia spiro subunit. This ... [+]
The reaction of N-Boc triprotected cyclam with bis(chloromethyl)biphenyl followed by the corresponding deprotection of the nitrogen atoms allows the preparation of receptor 3 containing an azonia spiro subunit. This receptor shows slightly increased basicity than cyclam, in particular for the formation of the appropriate triply charged species as a consequence of the reduced capacity of the structure present in 3 to stabilize the species with lower protonation degrees through the formation of intramolecular hydrogen bonds. The properties of 3 as a receptor for Cu2+ and Zn2+ and the anions derived from and ATP have been studied by pH-metric titrations carried out in aqueous solution. While Cu2+ forms a CuL2+ complex and two hydroxylated species of moderate stability, Zn2+ forms only hydroxylated complexes. The association constants obtained for the 1:1 A:L anion complexes denote significant stability for Pi, PPi and ATP; the stability of the H5LA complex found in the case of TPP being lower. 1H NMR spectra for the ATP:L carried out at pD=5.8 show features attributable to the occurrence of intermolecular π–π stacking between the biphenyl unit of 3 and the adenine ring of the nucleotide. DFT calculations have been carried out to rationalize some of the results found, in particular the remarkable different basicity between receptor 3 and cyclam. [-]
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