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Extended Networks Generated from the Interaction of Rare‐Earth(III) Ions and Pyridine‐2‐carboxamide‐Based Ligands
Author(s) -
van der Horst Maarten G.,
van Albada Gerard A.,
Ion RodicaMariana,
Mutikainen Ilpo,
Turpeinen Urho,
Tanase Stefania,
Reedijk Jan
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.200800031
Subject(s) - chemistry , monoclinic crystal system , pyridine , ligand (biochemistry) , lanthanide , crystallography , molecule , crystal structure , luminescence , ion , stereochemistry , medicinal chemistry , organic chemistry , biochemistry , physics , receptor , optoelectronics
The reaction of the ligand 1,4‐bis(pyridine‐2‐carboxamido)butane (L) with RECl 3 afforded complexes of general formula [RE(L) 1.5 Cl 2 (CH 3 OH)]Cl · n S (RE = Pr, Nd, Eu, Tb; n = 4, S = H 2 O; n = 5, S = CH 3 OH). The structural determination reveals that complexes [RE(L) 1.5 Cl 2 (CH 3 OH)]Cl · 5CH 3 OH (RE = Nd 2b , Eu 3b ) are isomorphous, crystallizing in the monoclinic system, space group P 2 1 / n ; they possess a 2D architecture with the rare‐earth ion in an eight‐coordination geometry. By exposure to air, the lattice methanol molecules are easily replaced by water molecules to form the analogues [RE(L) 1.5 Cl 2 (CH 3 OH)]Cl · 4H 2 O (RE = Pr 1 , Nd 2a , Eu 3a , Tb 4 ) as indicated by elemental analysis, IR, and thermogravimetric analysis. Photophysical studies on the Eu III and Tb III complexes showed that excitation into the ligand‐centered π→π* transition results in the characteristic visible luminescence from Eu III at 614 nm and Tb III at 545 nm. The magnetic properties were also investigated and show that crystal field effects are dominant. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)