Premium
Selective Capture of Ni 2+ Ions by Naphthalene‐ and Coumarin‐Substituted Dithiolenes
Author(s) -
Ghosh Ashta C.,
Weisz Klaus,
Schulzke Carola
Publication year - 2016
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/ejic.201500847
Subject(s) - chemistry , fluorescence , metal ions in aqueous solution , nickel , fluorophore , qualitative inorganic analysis , titration , naked eye , coumarin , metal , inorganic chemistry , ion , naphthalene , photochemistry , sn2 reaction , quenching (fluorescence) , stereochemistry , organic chemistry , detection limit , physics , chromatography , quantum mechanics
Naphthalene‐ and coumarin‐substituted dithiolene ligands were synthesized, and their coordination behavior towards different metal ions, including biologically relevant ions like Cu + , Cu 2+ , and Fe 3+ , was tested. Both ligands bind nickel selectively and show no evidence of binding any other metal investigated. Particularly, the compound bearing the fluorophore coumarin can serve as a colorimetric (“naked eye”) and on‐off fluorometric marker for the detection of Ni 2+ ions with a characteristic near‐infrared (NIR) signature even in the presence of various transition‐metal ions, which are normally difficult to differentiate from nickel. Competitive fluorescence experiments showed that the concomitant presence of Ag + , Al 3+ , Ca 2+ , Cd 2+ , Co 2+ , Cu + , Cu 2+ , Fe 3+ , Hg 2+ , Mg 2+ , Mn 2+ , Pb 2+ , Sn 2+ , Zn 2+ , and MoO 4 2– could not inhibit or diminish the Ni 2+ ‐specific fluorescence quenching, emphasizing the inherent Ni 2+ ion selectivity of the system. The coordination behavior of the marker and Ni 2+ were studied in detail by fluorescence titration experiments in THF/MeOH solution. X‐ray structures were determined to complement characterization of the precursors and the naphthalene–dithiolene–nickel complex.