Encapsulation of metal cations and anions within the cavity of bis(1,4,7-triazacyclononane) receptors

Dalton Transactions : an International Journal of Inorganic Chemistry
Carla BazzicalupiBarbara Valtancoli

Abstract

The synthesis and characterisation of a new bis([9]aneN3) ligand (L4) containing two [9]aneN3 macrocyclic moieties separated by a 2,6-dimethylenepyridine unit is reported. A potentiometric and 1H NMR study in aqueous solution reveals that ligand protonation occurs on the secondary amine groups and does not involve the pyridine nitrogen. The coordination properties toward Cu(II), Zn(II), Cd(II) and Pb(II) were studied by means of potentiometric and UV spectrophotometric measurements. The ligand can form mono- and binuclear complexes in aqueous solution. In the 1 : 1 complexes, the metal is sandwiched between the two [9]aneN3 moieties and the pyridine N-donor is coordinated to the metal, as actually shown by the crystal structure of the compound [ZnL4](NO3)2.CH3NO2. L4 shows a higher binding ability for Cd(II) with respect to Zn(II), probably due to a better fitting of Cd(II) ion inside the cavity generated by the two facing [9]aneN3 units. The formation of binuclear complexes is accompanied by the assembly of OH-bridged M2(OH)x (x = 1-3) clusters inside the cavity defined by the two facing [9]aneN3 units, and pyridine is not involved in metal coordination. A potentiometric and (1)H NMR study on the coordination of halogenide ani...Continue Reading

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Citations

Jun 12, 2014·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Ria SanyalDebasis Das
Oct 5, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Chanchal BhaumikSujoy Baitalik
Jan 17, 2008·Chemical Society Reviews·Philip A GaleJoachim Garric
Mar 27, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Alessandra GarauMariano Andrea Scorciapino

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