Dispersible Novel Naphthalene-2,6-Dicarboxylic Acid Monomethyl Ester-Based Coordination Polymers Through In Situ Hydrolysis Reaction: Highly Sensitive Detection of Small Molecules and Metal Ions
Two new naphthalene-2,6-dicarboxylic acid monomethyl ester-based coordination polymers formulated as [M(NDAME)2H2O] ∞ (M = Zn, 1; M = Cd, 2; NDAME = naphthalene-2,6-dicarboxylic acid monomethyl ester) have been synthesized through in situ hydrolysis of naphthalene-2,6-dicarboxylic acid dimethyl ester (NDADE) and characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD) and thermal gravimetric analysis (TGA). In compound 1, each NDAME ligand bridges two Zn into a one-dimension (1D) chain in a μ 2 – η 1 : η 1 coordination mode, in which two carboxyl groups and two Zn centers construct a distorted 8-membered ring. In compound 2, Cd metal centers are joined into 1D chain by NDAME ligand in μ 2 – η 1 : η 2 coordination mode, in which Cd centers and carboxyl oxygens are interconnected into an inorganic Cd–O chain. Notably, compounds 1 and 2 are stably dispersed in DMA without any stabilizer. The fluorescent properties of compounds 1 and 2 were investigated in the solid state and in various solvent emulsions. The results show that the photoluminescence of compounds 1 and 2 are both easily quenched by NB and 2-NT as well as Cu2+ ion and Fe3+ ion, showing highly naked-eye colorimetric sensing for small molecules and metal ions (NB = nitrobenzene and 2-NT = 2-nitrotoluene). The quenching mechanisms are also investigated in details.
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Document Type: Research Article
Publication date: 01 December 2017
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