The [1+1] Asymmetric compartmental macrocycles and/or related mononuclear, homodinuclear and sodium(I)-lanthanide(III) heterodinuclear complexes are reported and their properties investigated by SEM-EDS microscopy and 1H, 13C and 23Na NMR spectroscopy. These ligands bear a pendant arm, represented by a -CH2COOH (H3LA), -CH2C5H4N (H2LB) or -CH2C6H4OH (H3LC) group bonded to the aminic nitrogen, and contain a O2O3 crown-ether-like chamber and a N3XO2 (X= O, N) Schiff base chamber. It was found that the lanthanide(III) ion resides in the N3XO2 chamber while the sodium(I) ion fills the O2O3 crown-ether-like chamber, as ascertained for the complex [DyNa(LC)(PrOH)(Cl)] by a single crystal X-ray structural investigation.. The complex is monoclinic, space group P21/c, with a=9.601(2), b=12.927(2), c=26.638(4)Å, ²=99.55(3)°; The dysprosium ion is seven-coordinated in the N3O2 site, showing a pentagonal bipyramid coordination polyhedron and bonded, in the axial positions, to a chlorine ion and to the oxygen of pendant phenolic group of the ligand. Sodium ion is six-coordinated in the O3O2 site and bonded to the propyl alcohol oxygen. Furthermore, the potential use of these complexes as molecular probes for the selective recognition of specific metal ions has been tested. In particular, their ability to act as shift reagents towards Na+, was investigated by 23Na NMR spectroscopy. The relationship between the structure of these complexes in the solid state and in solution is reported.
[1+1]Asymmetric compartmental macrocycles bearing a functional group and related s,f-heterodinuclear complexes containing lanthanide(III) and sodium ions
Tamburini S;Casellato U;Vigato PA
2005
Abstract
The [1+1] Asymmetric compartmental macrocycles and/or related mononuclear, homodinuclear and sodium(I)-lanthanide(III) heterodinuclear complexes are reported and their properties investigated by SEM-EDS microscopy and 1H, 13C and 23Na NMR spectroscopy. These ligands bear a pendant arm, represented by a -CH2COOH (H3LA), -CH2C5H4N (H2LB) or -CH2C6H4OH (H3LC) group bonded to the aminic nitrogen, and contain a O2O3 crown-ether-like chamber and a N3XO2 (X= O, N) Schiff base chamber. It was found that the lanthanide(III) ion resides in the N3XO2 chamber while the sodium(I) ion fills the O2O3 crown-ether-like chamber, as ascertained for the complex [DyNa(LC)(PrOH)(Cl)] by a single crystal X-ray structural investigation.. The complex is monoclinic, space group P21/c, with a=9.601(2), b=12.927(2), c=26.638(4)Å, ²=99.55(3)°; The dysprosium ion is seven-coordinated in the N3O2 site, showing a pentagonal bipyramid coordination polyhedron and bonded, in the axial positions, to a chlorine ion and to the oxygen of pendant phenolic group of the ligand. Sodium ion is six-coordinated in the O3O2 site and bonded to the propyl alcohol oxygen. Furthermore, the potential use of these complexes as molecular probes for the selective recognition of specific metal ions has been tested. In particular, their ability to act as shift reagents towards Na+, was investigated by 23Na NMR spectroscopy. The relationship between the structure of these complexes in the solid state and in solution is reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
