A new tripodal poly-imine indole-containing ligand: Synthesis, complexation, spectroscopic and theoretical studies

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Abstract

A novel flexible tripodal ligand derived from 3-methylindole, ("InTREN" L), and its mononuclear Zn(II), Cu(II), Ni(II), Hg(II) and Pd(II) complexes are described. All compounds gave analytically pure solid samples. Characterisation of the compounds was accomplished by 1H NMR, IR and absorption spectroscopies, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) and elemental analysis and their geometry optimized using density functional theory (DFT). Time-dependent-density functional theory (TD-DFT) calculations have been used to assign the lowest energy absorption bands of the free ligand and the Zn(II) complex. The system is a very good candidate for in situ recognition/coordination effects by MALDI-TOF-MS spectrometry and absorption spectroscopy. The presence of three indole groups in InTREN opens up the possibility to synthesize new three-dimensional self-assembly supramolecular structures.

Original languageEnglish
Pages (from-to)2627-2635
Number of pages9
JournalInorganica Chimica Acta
Volume362
Issue number8
DOIs
Publication statusPublished - 1 Jun 2009

Keywords

  • Azomethine ligands
  • Indole
  • Receptors
  • Tripodal ligands

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