TY - JOUR
T1 - Synthesis and spectroscopic characterization of dinuclear calcium complexes with oxa-aza macrocyclic ligands
AU - Lodeiro, Carlos
AU - Bértolo, Emilia
AU - Capelo, José Luis
AU - Bastida, Rufina
PY - 2004/10/1
Y1 - 2004/10/1
N2 - The syntheses of dinuclear calcium perchlorate and/or nitrate complexes by template and direct methods, employing macrocyclic ligands with 18, 20, 22, and 26 membered rings are reported. The presence of pendant arms provide with coordinative NxOy donor atoms in the smaller macrocycles, the high number of donor atoms between 7 and 10, and the dinuclear composition obtained in all the systems examined, point out that in the formed solid complexes both Ca 2+ ions could be located inside of the macrocycle cavities. Transmetallation reaction of a lanthanide(III) complex, [L5Sm] (ClO4)3·9H2O, with Ca(ClO 4)2·xH2O leads the formation of the new dinuclear orange [L5Ca2](ClO4) 4·3H2O complex, manifesting the versatility of this macrocyclic cavity. All complexes have been characterized by microanalysis, IR, UV-vis, 1H NMR spectroscopy, FAB mass spectrometry, FAAS spectroscopy, and conductivity measurements.
AB - The syntheses of dinuclear calcium perchlorate and/or nitrate complexes by template and direct methods, employing macrocyclic ligands with 18, 20, 22, and 26 membered rings are reported. The presence of pendant arms provide with coordinative NxOy donor atoms in the smaller macrocycles, the high number of donor atoms between 7 and 10, and the dinuclear composition obtained in all the systems examined, point out that in the formed solid complexes both Ca 2+ ions could be located inside of the macrocycle cavities. Transmetallation reaction of a lanthanide(III) complex, [L5Sm] (ClO4)3·9H2O, with Ca(ClO 4)2·xH2O leads the formation of the new dinuclear orange [L5Ca2](ClO4) 4·3H2O complex, manifesting the versatility of this macrocyclic cavity. All complexes have been characterized by microanalysis, IR, UV-vis, 1H NMR spectroscopy, FAB mass spectrometry, FAAS spectroscopy, and conductivity measurements.
KW - Calcium
KW - Macrocycles
UR - http://www.scopus.com/inward/record.url?scp=4544276956&partnerID=8YFLogxK
U2 - 10.1002/zaac.200400039
DO - 10.1002/zaac.200400039
M3 - Article
AN - SCOPUS:4544276956
SN - 0044-2313
VL - 630
SP - 914
EP - 920
JO - Zeitschrift Fur Anorganische Und Allgemeine Chemie
JF - Zeitschrift Fur Anorganische Und Allgemeine Chemie
IS - 6
ER -