Polyamine Linear Chains Bearing Two Identical Terminal Aromatic Units. Evidence for a Photo Induced Bending Movement

M. Alexandra Bernardo, Sérgio Alves, Fernando Pina, J. Seixas de Melo, M. Teresa Albelda, Enrique Garcia-España, José Miguel Llinares, Conxa Soriano, Santiago V. Luis

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Several chemosensors bearing a fluorescent unit at both ends of a linear polyamine chain were synthesised. The protonation as well as the association constants with Cu2+ and Zn2+ were determined by potentiometry in 0.15 mol dm-3 NaCl at 298.1K. In the case of 1,16-bis(1-naphthylmethyl)-1,4,7,10, 13,16-hexaazadecane hexahydrochloride (L1), formation of an excimer emission in aqueous acidic solutions was observed. The system was characterized by steady state fluorescence emission and by time resolved fluorescence. In the ground state the molecule is expected to adopt a more or less linear conformation, while in the excited state a bending movement of the chain must occur in order to allow the excimer emission. The system can be viewed as an elementary machine driven by light.

Original languageEnglish
Pages (from-to)435-445
Number of pages11
JournalSupramolecular Chemistry
Volume13
Issue number3
DOIs
Publication statusPublished - 1 Jan 2001

Keywords

  • Chemosensors
  • Excimer
  • Molecular machines
  • Polyamine

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