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Solutions containing naproxen, its methyl ester and Cu2+, or naphthalene acetic acid, its methyl ester and Cu2+ was analyzed by using electrospray ionization mass spectrometry. As a result of interaction between Cu2+ and aromatic system (Cu2+–π interaction), the respective molecular ions were obtained. The interactions of Cu2+ with –COOH and –COOCH3 groups compete with that of Cu2+ with naphthalene...
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