A novel Ni/Na – Containing inorganic-organic hybrid supramolecule based on polyoxometalate and EDTA with ultraviolet-visible light photochromism

•A 3D inorganic-organic hybrid exhibits intriguing infinite supramolecular structure with Na+ ions as linker.•The compound exhibits excellent reversible photochromism under both UV and visible lights which with a long-life.•It is the first time using O+ − H groups as proton source obtain visible light photochromic OACs – POM material.

A novel Ni/Na – containing inorganic-organic hybrid supramolecule {(PW12O40)·[Na2(NiH2EDTA·H2O)(H4EDTA)·2H2O]·2H2O·H3O}n (short for NiEDTA-PW12) has been successfully synthesized by solution method, and investigated by thermogravimetric-differential thermal analysis (TG-DTA), ultraviolet visible (UV-Vis) spectroscopy, cyclic voltammetry (CV), photoluminescence (PL), ultraviolet visible diffuse reflectance spectrum (UV-vis DRS) and single-crystal X-ray diffraction (XRD). NiEDTA-PW12 exhibits intriguing infinite supramolecular structure with Na+ ions as linker. Furthermore, NiEDTA-PW12 displays a fast-responsive reversible photochromism under ultraviolet or visible light. The photochromic property of NiEDTA-PW12 has been investigated by techniques of UV-vis DRS and PL, and the impact of the O2 on fading of the colored NiEDTA-PW12 has been investigated.

Graphical abstractA novel Ni/Na – containing inorganic-organic hybrid supramolecule based on polyoxometalate and EDTA has been successfully synthesized by solution method. It exhibits intriguing infinite supramolecular structure with Na+ ions as linker. Importantly, the hybrid compound displays fast-responsive reversible photochromic phenomenon under both ultraviolet and visible lights irradiation and with a long-life of photochromism.Figure optionsDownload full-size imageDownload as PowerPoint slide