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New Fluorenyl‐Substituted Dioxotetraamine Ligands and Their Copper(II) Complexes − Crystal Structure and Fluorescent Sensing Properties in Aqueous Solution
Author(s) -
Jiang LiJian,
Luo QinHui,
Li QingXiang,
Shen MengChang,
Hu HongWen
Publication year - 2002
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(200203)2002:3<664::aid-ejic664>3.0.co;2-n
Subject(s) - chemistry , potentiometric titration , aqueous solution , fluorescence , copper , titration , quenching (fluorescence) , crystal structure , metal ions in aqueous solution , inorganic chemistry , metal , ion , crystallography , photochemistry , organic chemistry , physics , quantum mechanics
Two new ligands consisting of a fluorenyl and dioxotetraaza unit, namely, 2,10‐diamino‐6‐(9 H ‐fluoren‐9‐yl)‐4,8‐diazaundecane‐5,7‐dione (L 1 ) and 1‐(9 H ‐fluoren‐9‐yl)‐1,4,7,10‐tetraazadecane‐5,6‐dione (L 2 ) along with their copper(II) complexes have been synthesized. Their properties were examined by ES‐MS and CV in aqueous solution and the crystal structure of the copper(II) complex of L 1 has also been determined. The recognition of the transition metal ions (Cu 2+ , Ni 2+ , etc.) by receptors has been studied in aqueous solutions using pH‐potentiometric and fluorimetric titrations. The results show that the binding of Cu 2+ or Ni 2+ ion with L 1 leads to quenching of the fluorescence of the fluorenyl group, but on the contrary the fluorescence of L 2 is enhanced. The mechanisms are discussed.