Synthesis, characterization and oscillator-vibrated near-infrared (NIR) luminescence of two pseudo-polymorphic [Yb4((OH)2-Salophen)4] complexes

Zhao Zhang, Heini Feng, Lin Liu, Weixu Feng, Chao Yu, Xingqiang Lü*, Rick W K WONG, Richard A. Jones

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

2 Citations (Scopus)


Through the self-assembly of the (OH)2-Salophen H4L (H4L = N,N′-bis(3-hydroxylsalicylidene)benzene-1,2-diamine) with LnCl3·6H2O or Ln(NO3)3·6H2O (Ln = La, Yb or Gd) in different solvent systems MeCN-EtOH and MeCN-DMF, the mixed (L)4- and (H2L)2- coordination modes induce the formation of anion-independent while pseudo-polymorphic homoleptic linear tetranuclear complexes [Ln4(H2L)2(L)2(EtOH)2] (Ln = La, 1; Ln = Yb, 2 or Ln = Gd, 3) and [Ln4(H2L)2(L)2(DMF)2] (Ln = La, 4; Ln = Yb, 5 or Ln = Gd, 6), respectively. The result of their photophysical properties shows the characteristic NIR luminescence for both Yb3+-based complexes 2 and 5 with emissive lifetimes in microsecond ranges, while the difference of nearby and/or distant oscillator-based (OH and/or CH) vibrations from two coordinated EtOH or DMF molecules within the inner coordination spheres of Yb3+ ions in the two complexes has a decisive effect on their NIR luminescent properties.

Original languageEnglish
Pages (from-to)188-195
Number of pages8
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Publication statusPublished - 5 May 2015

Scopus Subject Areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

User-Defined Keywords

  • Oscillator-vibrated NIR luminescence
  • Pseudo-polymorphism
  • Tetranuclear [Ln((OH)-Salophen)]-arrayed complexes


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