Anderson-type polyoxometalate-based complexes constructed from a new 'V'-like bis-pyridine–bis-amide ligand for selective adsorption of organic dyes and detection of Cr(vi) and Fe(iii) ions. Issue 20 (24th August 2021) - Zhang, Yue
Abstract : Four isostructural complexes constructed from Anderson-type POM and new 'V'-like ligands exhibited outstanding selective adsorption capacities for organic dyes, and electrochemical sensing behaviors toward Cr(vi ) and Fe(iii ) ions. Abstract : By introducing a new 'V'-like bis-pyridine–bis-amide ligand 4, 4′-bis(4-pyridinecarboxamide)phenylmethane (L) into the reaction system based on Anderson-type polyoxometalates [XMo6 (OH)6 O18 ] 3− (X = Al or Cr), four metal–organic complexes (MOCs) 1–4, [Zn(HL)(H2 O)2 (XMo6 (OH)6 O18 )]·5H2 O (1 : X = Al; 2 : X = Cr), [Co(HL)(H2 O)2 (XMo6 (OH)6 O18 )]·5H2 O (3 : X = Al; 4 : X = Cr), have been prepared under solvothermal conditions, which have been characterized by single crystal X-ray diffraction, IR spectra, and PXRD. All structures of 1–4 involved a 2D layer that originated from XMo6 polyoxoanions and metal ions, on both sides of which the L ligands were hanged. Complexes 1–4 showed not only outstanding selective adsorption capacities for organic dyes crystal violet, methylene blue and neutral red, but also electrochemical sensing behaviors toward Cr(vi ) ions and Fe(iii ) ions with well-pleasing limits of detection of 0.606 nM (6.24 × 10 −5 ppm) and 0.0192 μM (1.08 × 10 −3 ppm), suggesting their potential application as multifunctional materials.