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Synthesis and Spectroscopic Characterization of Dinuclear Calcium Complexes with Oxa‐Aza Macrocyclic Ligands
Author(s) -
Lodeiro Carlos,
Bértolo Emilia,
Capelo José Luis,
Bastida Rufina
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400039
Subject(s) - chemistry , transmetalation , perchlorate , lanthanide , nuclear magnetic resonance spectroscopy , stereochemistry , polymer chemistry , medicinal chemistry , ion , organic chemistry , catalysis
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, [L 5 Sm](ClO 4 ) 3 ·9H 2 O, with Ca(ClO 4 ) 2 ·xH 2 O leads the formation of the new dinuclear orange [L 5 Ca 2 ](ClO 4 ) 4 ·3H 2 O complex, manifesting the versatility of this macrocyclic cavity. All complexes have been characterized by microanalysis, IR, UV‐vis, 1 H NMR spectroscopy, FAB mass spectrometry, FAAS spectroscopy, and conductivity measurements.