Luminescence behaviour of cadmium, lead, zinc, copper, nickel and lanthanide complexes of octadentate macrocyclic ligands bearing naphthyl chromophores
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 7,p. 1305-1314
- https://doi.org/10.1039/p29950001305
Abstract
The luminescence behaviour of two macrocyclic ligands incorporating naphthyl fluorophores has been studied in water and acetonitrile. The ligands 1,4,7-tris(methylcarbamoylmethyl)-10-(2-naphthylmethylcarbamoylmethyl)-1,4,7,10-tetraazacyclododecane, 1 and 1,4,7,10-tetrakis(2-naphthylmethylcarbamoylmethyl)-1,4,7,10-tetraazacyclododecane, 2, exhibit distinctive luminescence behaviour in the presence of quenching (e.g., PbII, CuII and NiII) and non-quenching ions (e.g., CdII and ZnII). The protonated tetranaphthyl ligand forms a well-defined excimer in which excimer emission is a sensitive probe of solvent polarity. The naphthyl group serves as an antenna for energy transfer to the phosphorescent bound europium ion and amide N–H coupling provides a significant deactivation mechanism for the excited Eu5D0 state.Keywords
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