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A series of four coordinated transition metal chelates of composition [M(R1)2], where M=Cu(II), Co(II), Ni(II) and Zn(II) and R1=quinone-imidazole ensemble, have been prepared and characterized by using standard analytical and spectral techniques. These metal chelates selectively (over many anions) and sensitively (detection limit down to nM) sense fluoride ion colorimetrically with an instantaneous...
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