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Heterobinuclear Zn‐Ln (Ln = La, Nd, Eu, Gd, Tb, Er and Yb) complexes based on asymmetric Schiff‐base ligand: synthesis, characterization and photophysical properties
Author(s) -
Zhao Shunsheng,
Liu Xiangrong,
Lü Xingqiang,
Wong WaiKwok
Publication year - 2012
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2417
Subject(s) - schiff base , lanthanide , chemistry , ligand (biochemistry) , excited state , luminescence , phenylene , intramolecular force , photochemistry , crystallography , diamine , microsecond , chromophore , ion , materials science , stereochemistry , polymer chemistry , polymer , biochemistry , physics , receptor , optoelectronics , organic chemistry , astronomy , nuclear physics
With a novel asymmetric Schiff‐base zinc complex ZnL (H 2 L = N‐(3‐methoxysalicylidene)‐N′‐(5‐bromo‐3‐methoxysalicylidene)phenylene‐1,2‐diamine), obtained from phenylene‐1,2‐diamine, 3‐methoxysalicylaldehyde and 5‐bromo‐3‐methoxysalicylaldehyde, as the precursor, a series of heterobinuclear Zn‐Ln complexes [ZnLnL(NO 3 ) 3 (CH 3 CN)] (Ln = La, 1; Ln = Nd, 2; Ln = Eu, 3; Ln = Gd, 4; Ln = Tb, 5; Ln = Er, 6; Ln = Yb, 7) were synthesized by the further reaction with Ln(NO 3 ) 3 ·6H 2 O, and characterized by Fourier transform‐infrared, fast atom bombardment mass spectroscopy and elemental analysis. Photophysical studies of these complexes show that the strong and characteristic near‐infrared luminescence of Nd 3+ , Yb 3+ and Er 3+ with emissive lifetimes in the microsecond range has been sensitized from the excited state of the asymmetric Schiff‐base ligand due to effective intramolecular energy transfer; the other complexes do not show characteristic emission due to the energy gap between the chromophore and lanthanide ions. Copyright © 2012 John Wiley & Sons, Ltd.