Sensing metal ions with two new azomethine-thiophene pincer ligands (NSN): Fluorescence and MALDI-TOF-MS applications

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The two new pincer azomethine-thiophene ligands (N,NE′,N,NE′)-N,N′-(thiophene-2,5-diylbis(methan-1-yl-1-ylidene))bis(naphathalen-2-ylmethanamine) (L1) and (E)-(4,6-dihydropyren-1-yl)-N-((5-((E)-(pyren-1-ylmethylimino)ethyl)thiophen-2-yl)methylene)methanamine (L2), their absorption, fluorescence and MALDI-TOF-MS spectroscopic studies are described. The two systems synthesised combine the emissive probes pyrene and naphthyl with the good chelating properties of a tridentate SN2 donor-set from a thiophene Schiff-base ligand. Both ligands gave analytically pure solid complexes with Ni(II) and Pd(II) salts. The bichromophoric pyrene derivative L2 presents two emission bands in solution, one corresponding to the monomer species and a red-shifted band attributable to the intramolecular excimer. Ni(II) and Pd(II) complexation affects the conformation in solution, increasing the monomer emission at the expense of the excimer band; this effect could be explored in metal ion sensing. System L1 behaves as a non emissive probe. In situ complexation reactions followed by MALDI-TOF-MS spectrometry without matrix support have also been performed; these experiments show that L1 could be a potential chemosensor for Ni(II) and Pd(II).

Original languageEnglish
Pages (from-to)925-929
Number of pages5
JournalInorganic Chemistry Communications
Volume10
Issue number8
DOIs
Publication statusPublished - 1 Aug 2007

    Fingerprint

Keywords

  • Fluorescent chemosensors
  • MALDI-TOF-MS
  • Nickel(II)
  • Palladium(II)
  • Thiophene

Cite this