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A series of compounds 1–11 with different side chains of naphthalimide as fluorescent copper sensors were designed and synthesized. Compounds 1, 9, 10 and 11 presented a high selectivity to Cu2+ in a neutral aqueous environment. Here 1, 9 and 10 showed selectivity and affinity to Cu2+ with an association constant of about ∼106. It gave somewhat response to Ag+, Co2+, Ni2+ and Fe2+ while 1 detected...
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