Fluorescent type II materials from naphthylmethyl polyamine precursors

Javier Alarcón, Ricardo Aucejo, M. Teresa Albelda, Sérgio Alves, M. Paz Clares, Enrique García-España, Carlos Lodeiro, Katherine L. Marchin, A. Jorge Parola, Fernando Pina, J. Seixas de Melo, Concepción Soriano

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Speciation studies in aqueous solution on the interaction of Cu 2+ and Zn2+ with a series of polyaminic ligands N-naphthalen-1-ylmethyl-N′-{2-[(naphthalen-1-ylmethyl)-amino]-ethyl} -ethane-1,2-diamine (Ll), N-naphthalen-1-ylmethyl-N′-(2-{2-[(naphthalen-1- ylmethyl)-amino]-ethyl-amino}-ethyl)-ethane-1,2-diamine (L2) and N-naphthalen-1-ylmethyl-N′-[2-(2-{2-[(naphthalen-1-ylmethyl)-amino] -ethylamino}-ethylamino)-ethyl]-ethane-1,2-diamine (L3) containing two naphthylmethyl groups at their termini and N1-(2-{2-[(naphthalen-1- ylmethyl)-amino]-ethyl-amino}-ethyl)-ethane-1,2-diamine (L4) containing just one naphthylmethyl group have been carried out at 298.1 K in 0.15 mol dm -3 NaCl. In the case of the tetraamines L2 and L4, their coordination capabilities towards Cd2+, Ni2+, Co2+ and Pb2+ have also been considered. The stability constants follow the general Irving-Williams sequence. The steady-state fluorescence emission studies on the interaction with metal ions show that while Cu2+ produces a chelation enhancement of the quenching (CHEQ), the interaction with Zn 2+ leads to a chelation enhancement of the fluorescence (CHEF). Finally, ligands L1, L2 and L3 have been successfully covalently attached to silica surfaces and some preliminary results of their emissive properties are given.

Original languageEnglish
Pages (from-to)573-580
Number of pages8
JournalSupramolecular Chemistry
Volume16
Issue number8
DOIs
Publication statusPublished - 1 Dec 2004

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