Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Hetero-trinuclear near-infrared (NIR) luminescent Zn2Ln complexes from Salen-type Schiff-base ligands

Language

English

Abstract

With the Zn-Schiff-base [ZnL1(Py)] or [ZnL2(Py)] from the simple Salen-type Schiff-base ligand H2L1 or H 2L2 (H2L1: N,N′- bis(salicylidene)ethylene-1,2-diamine; H2L2: N,N′-bis(salicylidene)phenylene-1,2-diamine) without the outer O 2O2 portion as the precursor, two series of eight trinuclear Zn2Ln arrayed complexes (Ln = Nd (1 or 5), Yb (2 or 6), Er (3 or 7) or Gd (4 or 8)) have been obtained by the further reaction with Ln(NO3)3·6H2O, respectively. The results of photophysical studies show that the strong and characteristic NIR luminescence with emissive lifetimes in microsecond ranges, has been sensitized from the excited state (1LC and 3LC or only 1LC) of the ligand, whereas the Zn(ii)-based visible luminescence is mostly quenched because of quite effective intramolecular energy transfer from the ligand-centered excited state of the Zn(ii)-Schiff base complex to Ln(iii) ions. © 2009 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

Publication Date

2009

Source Publication Title

New Journal of Chemistry

Volume

33

Issue

11

Start Page

2326

End Page

2334

Publisher

Royal Society of Chemistry

DOI

10.1039/B9NJ00228F

Link to Publisher's Edition

http://dx.doi.org/10.1039/B9NJ00228F

ISSN (print)

11440546

ISSN (electronic)

13699261

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