Crystal structure,luminescent and thermochromic properties of bis-1,10-phenan-throlinium hexachlorotellurate(IV) dihydrate

By single crystal X-ray analysis, the atomic structure of the crystals of bis-phenanthrolinium hexachlorotellurate(IV) dihydrate (C₁₂H₉N₂)₂ TeBr₆·2H₂O (a = 7.4846(5) Å, b = 13.792(1) Å, c = 14.532(1) Å, β = 99.857(2)°, space group P2₁/c, Z = 2, d _x = 2.259 g/cm³) is determined. The crystal structure is formed from separate anions TeBr₆]^2?, cations of phenanthrolinium (C₁₂H₉N₂)⁺, and water molecules. The electronic and geometrical aspects determining the spectral-luminescent and thermochromic properties of the complex are discussed.