Synthesis, structural diversity, and methanol vapor adsorption properties of three Hg(II) halide complexes derived from a helical Schiff base

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Abstract

The Schiff base condensation reaction between precursor diamine N , N' -bis(2-aminophenyl)-pyridine-2,6-dicarboxamide and 1,8-naphthyridine-2-carbaldehyde yielded a racemic compound ( L P / L M ), which was characterized by 1 H/ 13 C NMR, infrared spectroscopy, elemental analysis, and single crystal X-ray diffraction. Three complexes, [Hg 2 L I 4 ] ( 1 ), [Hg 2 L Br 4 ] ( 2 ), and [Hg 2 L 2 Cl 4 ]‧2H 2 O ( 3 ) with different coordination configurations were obtained from the reaction of this compound with HgX 2 (X = I , Br , and Cl ), respectively, and their crystal structures and coordination geometries were determined via single crystal X-ray diffraction techniques. Both 1 and 2 exist as dinuclear complexes with a 1:2 molar ratio of L and Hg(II), while 3 exists as a 44-membered metallamacrocycle with a 1:1 molar ratio of L and Hg(II). The structural diversity of these three complexes indicates that the counter anions have significant effects on the structural topology. In addition, the solid-state luminescence and the gas adsorption of these complexes towards methanol vapor at room temperature were investigated.

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