Photoinduced electron transfer and electronic energy transfer in naphthyl-appended cyclams

P V Bernhardt; E G Moore; M J Riley

doi:10.1021/ic0102586

Photoinduced electron transfer and electronic energy transfer in naphthyl-appended cyclams

Inorg Chem. 2001 Nov 5;40(23):5799-805. doi: 10.1021/ic0102586.

Authors

P V Bernhardt¹, E G Moore, M J Riley

Affiliation

¹ Department of Chemistry, University of Queensland, Brisbane, Australia 4072.

PMID: 11681888
DOI: 10.1021/ic0102586

Abstract

A series of novel macrocyclic tetraaza ligands that incorporate a naphthalene moiety as a photoactive chromophore have been prepared and structurally characterized as their Cu(II) complexes. Variable-temperature photophysical studies have concluded that the luminescence quenching evident in the Cu(II) complexes is due to intramolecular electronic energy transfer (EET). In their free-base forms, these ligands undergo reductive luminescence quenching via photoinduced electron transfer (PET) reactions, with proximate amine lone pairs acting as electron donors. Consequently, the emission behavior can be modulated by variations in pH and/or the presence of other Lewis acids such as Zn(II).