Multifunctional indium complexes with fluorescent sensing and selective adsorption dye properties

Abstract

Under hydrothermal conditions, four new complexes [InCl₂(Hphth)(4,4′-bipy)_0.5(H₂O)]·2H₂O (H₂phth = phthalic acid, 4,4′-bipy = 4,4′-bipyridine) (1), [InCl₄(4,4′-bipyH)(H₂O)] (2), [InCl(Hphth)(nia)(H₂O)₂] (Hnia = nicotinic acid) (3), [InCl(Hnia)₂(Hox)₂]·3H₂O (H₂ox = oxalic acid) (4) were synthesized by the reaction of Indium chloride (InCl₃) as the metal source with H₂phth, Hnia, 4,4′-bipy and H₂ox as the ligands. The single-crystal X-ray diffraction analysis revealed that the complexes 1, 3 and 4 have 3D supramolecular structures with hydrogen bonding interactions and, complex 2 has an extended one-dimensional chain structure, which further forms a 2D supramolecular sheet structure. We discussed and proved the fluorescence sensing functions of these complexes for the different thiamine (TPP, TCl) biomolecules based on a “turn-on” manner. In addition, it is fascinating that these complexes have different potential adsorption characteristics and the adsorption performance of complex 1 was observed to be better than the others. The photoluminescence and dye selective adsorption properties of these complexes have been studied for the first time.