A highly selective colorimetric and fluorescent probe for Cu2+ and Hg2+ ions based on a distyryl BODIPY with two bis(1,2,3-triazole)amino receptors.
A new distyryl boron dipyrromethene (BODIPY) with two bis(1,2,3-triazole)amino substituents has been prepared by typical Knoevenagel condensation followed by click reaction. The compound selectively binds to Cu(2+) and Hg(2+) ions in CH(3)CN/H(2)O (1:1 v/v) to give remarkably blueshifted electronic absorption and fluorescence bands as a result of inhibition of the intramolecular charge-transfer process upon binding to these metal ions. The color changes can be easily seen by the naked eye. The binding stoichiometry between this probe and Cu(2+) ions has been determined to be 1:2 by a Job plot of the fluorescence data with a binding constant of ((6.2±0.6)×10(9)) M(-2). The corresponding value for Hg(2+) ions is about sixfold smaller.
Department of Chemistry and Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China.
Wen-Jing
WJ
Shi
Jian-Yong
JY
Liu
Dennis K P
DK
Ng
D001896:Boron Compounds / Q000737:chemistry*; D057930:Click Chemistry; D003124:Colorimetry; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D008628:Mercury / Q000032:analysis*; D015394:Molecular Structure; D014230:Triazoles / Q000737:chemistry*
D001896:Boron Compounds; D005456:Fluorescent Dyes; D007477:Ions; D014230:Triazoles; D003300:Copper; D008628:Mercury