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Synthesis, Structure, Spectroscopic Studies and Magnetic Properties of the Tetrakis(5,7‐dichloro‐8‐quinolinolato)gadolinium(III) Complex
Author(s) -
Artizzu Flavia,
Bernot Kevin,
Caneschi Andrea,
Coronado Eugenio,
ClementeJuan Juan M.,
Marchiò Luciano,
Mercuri Maria Laura,
Pilia Luca,
Serpe Angela,
Deplano Paola
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800388
Subject(s) - gadolinium , chemistry , deprotonation , denticity , protonation , stacking , ion , chelation , chloride , crystallography , inorganic chemistry , crystal structure , organic chemistry
Abstract The synthesis and structural characterization of the neutral gadolinium tetrakis‐type complex with 5,7‐dichloro‐8‐quinolinolato (H5,7ClQ) ligands, [Gd(5,7ClQ) 2 (H5,7ClQ) 2 Cl], is reported. The Gd III ion is epta coordinated to one chloride ion and to four ligands: two N,O‐chelated monoanions and two as zwitterionic ( + NH and O – ) monodentate oxygen donors. Electronic and vibrational spectra provide suitable markers to distinguish the presence of deprotonated and protonated ligands. The magnetic behaviour of this compound was investigated and explained by taking into account that π–π stacking interactions between the (H5,7ClQ) ligands give rise to a ferromagnetic interaction between the gadolinium centres. The Gd III derivatives provide magnetic evidence for the presence of stacking interactions, which are usually undetectable in optically active Er III derivatives.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)