The elemental analyses of C, H, and N were performed with Thermo Scientific Flash 2000 Organic Elemental Analyzer. Infrared (IR) spectra were recorded in the range of 4000 -550 cm -1 on PerkinElmer FT-IR Frontier spectrometer. UV-vis-NIR spectra were carried out in the region of 250 -2000 nm on a Lambda 1050+ UV-vis-NIR spectrometer. Solid-state UV-vis-NIR measurements were carried out by taking 5% sample by weight in KBr. Thermogravimetric analysis (TGA) was done on a Mettler Toledo TGA/SDTA851 analyzer with a heating rate of 10 °C min -1 under a nitrogen atmosphere ranging from 30°C to 300 °C. PXRD data analyses were done using PANalytical X'Pert HighScore Plus software.