A 2D copper(I) metal-organic framework: Synthesis, structure and luminescence sensing for cupric, ferric, chromate and TNP

Abstract

A multi-responsive Cu-MOF {[CuI2(ttpa)2][CuII (bptc)]•3H2O•DMF}n (1•3H2O•DMF) was synthesized using hydrothermal method (ttpa = tris(4-(1,2,4-triazol-1-yl)phenyl)amine, H4bptc = 3,3′,4,4′-biphenyltetracarboxylic acid), and characterized by elemental analysis, IR spectra, single-crystal and powder X-ray diffraction analysis, TGA, luminescence and XPS. 1 exhibits the (3,3)-connected 63-hcb topologic cationic networks [CuI2(ttpa)2]n encapsulated the [CuII2(bptc)2]4- dimeric anions. 1 is a good luminescence sensor for multi-detection, sensitivity and recyclability of Cu2+, Fe3+, Cr2O72−, CrO42− and TNP. 1 shows the highest Ksv 2.460 × 105 M−1 for detection of Cu2+ of MOFs sensors and the lowest detection limit 0.062 μM (3.9 ppb) for MOFs sensors, which is obvious lower than the permissible concentrations 2.0 μM (1.3 ppm) and 3.1 μM (2.0 ppm) in drinking water determined by the US EPA and WHO. 1 exhibits the high Ksv 5.350 × 104 M−1 for detection of Cr2O72− and 5.311 × 104 M−1 for CrO42−, and the low detection limit 0.058 μM (13.0 ppb) for Cr2O72− and 0.070 μM (8.1 ppb) for CrO42−, which is below the acceptable limit for the drinking water standard (total chromium 100 ppb by the US EPA). 1 also exhibits the high Ksv 6.646 × 104 M−1 and the low detection limit 0.22 μM (50 ppb) for detection of TNP. 1 exhibits high photocatalytic efficiency for degradation of methylene blue under visible light irradiation.