Heterobinuclear Zn‐Ln (Ln = La, Nd, Eu, Gd, Tb, Er and Yb) complexes based on asymmetric Schiff‐base ligand: synthesis, characterization and photophysical properties. (24th September 2012)

• Record Type: Journal Article
• Authors: Zhao, Shunsheng; Liu, Xiangrong; Lü, Xingqiang; Wong, Wai‐Kwok
• Is Part Of: Luminescence. Volume 28:Number 5(2013:Sep./Oct.)
• Page Start: 690
• Page End: 695
• Publication Date: 2012-09-24
• Subjects: Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.2417
• Languages: English
• ISSNs: 1522-7235

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>With a novel asymmetric Schiff‐base zinc complex ZnL (H₂L = 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(NO₃)₃(CH₃CN)] (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(NO₃)₃·6H₂O, 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 Nd³⁺, Yb³⁺and Er³⁺ 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 &amp; Sons, Ltd.</p> </abstract>