Study on the Difference of Photochromic and Thermochromic Mechanism of Ethylenediamine Trimolybdate

摘要

Ethylenediamine trimolybdate ((C_2H_(10)N_2)[Mo_3O_(10)],denoted as ENTMo)shows unusual photochromic and thermochromic properties.The color of the white ENTMo compounds becomes reddish brown gradually under UV irradiation,and changes gradually to blue-black upon annealing.XRD patterns and FT-IR spectra verify that the crystal structure of the colored samples is almost unchanged except distortion.UV-vis diffuse reflectance spectra (DRS)and ESR spectra of the photochromic and the thermochromic samples could confirm that there must exist difference between thermochromic and photochromic mechanism.