2D Zn (II) Metal-Organic Framework as a Highly Sensitive Luminescent Sensor for Detection of the Cr2O72- and Fe3+

In this work, NH2-containing organic ligand 5-Aminoisophthalic acid (AIPA), and trans-1,2-bis(4-pyridyl)ethene (bpe) were selected as organic ligands to construct a new two-dimensional luminescent Zn(II) metal-organic framework [Zn(AIPA)(bpe)(1/2)]& sdot;named MOF-1. It is worth noting that MOF-1 exhibited excellent thermal stability and chemical stability in common solvents and different pH aqueous solution. As we expected, the luminescence sensing investigations demonstrated that MOF-1 could be deemed as a multifunctional fluorescence sensor toward Cr2O72- and Fe3+ via a "turn-off" effect. Notably, MOF-1 had high selectivity and sensitivity for Fe3+ and Cr2O72- with low detection limits of 9.72x10(-5) M and 1.95x10(-5) M, respectively. Furthermore, the possible quenching mechanisms were also explored in detail.