Effect of Heavy-Atom (Br) at the Phenyl Rings of Schiff-Base Ligands on the NIR Luminescence of their Bimetallic Zn-Nd Complexes

Two heterobimetallic Zn‐Nd phenylene‐bridged Schiff‐base ligands complexes [ZnNdL1(Py)(NO3)3] (1) and [ZnL2Nd(Py)(NO3)3]·MeCN (2) (Py = pyridine, H2L1 = N,N′‐bis‐ (3‐methoxy‐salicylidene)phenylene‐1,2‐diamine, H2L2= N,N′‐bis‐5‐bromo‐3‐methoxy‐salicylidene)phenylene‐1,2‐diamine) were obtained. Both 1...

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Published in:Zeitschrift für anorganische und allgemeine Chemie (1950) 2008-08, Vol.634 (10), p.1795-1800
Main Authors: Bi, Wei-Yu, Lü, Xing-Qiang, Chai, Wen-Li, Song, Ji-Rong, Wong, Wai-Kwok, Yang, Xiao-Ping, Jones, Richard A.
Format: Article
Language:English
Subjects:
Heavy-atom effect
Heterobimetallic Zn-Nd Schiff-base complexes
Neodymium
NIR luminescent property
Zinc
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Summary:Two heterobimetallic Zn‐Nd phenylene‐bridged Schiff‐base ligands complexes [ZnNdL1(Py)(NO3)3] (1) and [ZnL2Nd(Py)(NO3)3]·MeCN (2) (Py = pyridine, H2L1 = N,N′‐bis‐ (3‐methoxy‐salicylidene)phenylene‐1,2‐diamine, H2L2= N,N′‐bis‐5‐bromo‐3‐methoxy‐salicylidene)phenylene‐1,2‐diamine) were obtained. Both 1 and 2 were structurally characterized by X‐ray crystallography, and their near‐infrared (NIR) luminescent properties were determined. For the two complexes, the occupation of pyridine at the axial position of 3d Zn2+ ions could effectively prevent luminescent quenching arising from OH‐, NH‐ or CH oscillators of the solvates around the 4f Nd3+ ions, and the heavy‐atom (Br) effect of the Schiff‐base ligands on their NIR luminescent properties is also discussed.
ISSN:0044-2313
1521-3749
DOI:10.1002/zaac.200800137