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Open‐Chain Polyamine Ligands Bearing an Anthracene Unit − Chemosensors for Logic Operations at the Molecular Level
Author(s) -
Alves Sérgio,
Pina Fernando,
Albelda M. Teresa,
GarcíaEspaña Enrique,
Soriano Conxa,
Luis Santiago V.
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200102)2001:2<405::aid-ejic405>3.0.co;2-m
Subject(s) - chemistry , protonation , anthracene , chelation , polyamine , fluorescence , photochemistry , quenching (fluorescence) , stability constants of complexes , stereochemistry , inorganic chemistry , organic chemistry , aqueous solution , biochemistry , physics , ion , quantum mechanics
In this work the absorption and the fluorescence emission properties as well as the protonation sequence of three open chain polyamine ligands of different dimensions bearing an anthracene unit were studied. The protonation and stability constants with Ni 2+ , Cu 2+ , Zn 2+ , and Cd 2+ have been determined in 0.15 mol·dm −3 NaCl at 298.1 ± 0.1 K. The values of both protonation and stability constants follow the expected trends according to the number of nitrogen donors, sequence of chelate rings and hydrophilic−hydrophobic balance. Chelation enhancement of the fluorescence emission (CHEF) was observed for some complexes of these ligands with Zn 2+ and Cd 2+ . In contrast the analog complexes containing Cu 2+ and Ni 2+ exhibit a chelation enhancement of the quenching (CHEQ) except for the complexes with the largest chain where some protonated metal complexes are emissive. These systems are explored from the point of view of chemosensors for logic operations at the molecular level.