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DB‐cyclen [1,7‐bis(phenylmethyl)‐1,4,7,10‐tetraazacyclododecane] was investigated in 50 % CH3OH/H2O (v/v) as a fluorescent sensor for heavy metal ions, and as the CdII complex as a sensor for anions. The PbII complex showed a unique strong emission at 447 nm, possibly a charge‐transfer band involving the 6p←6s2 transition of PbII and the benzyl fluorophore. ZnII uniquely produced a significant emission...
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