| Abstract
| - Two intermetallic tellurides, Mn(en)3]CdSnTe4 (I) and [Mn(en)3]Ag6Sn2Te8 (II), have beensynthesized in superheated ethylenediamine solutions at 180 °C. Single-crystal X-raydiffraction analyses show that I crystallizes in triclinic crystal system, space group P1 (No.1) with lattice parameters a = 9.134(2) Å, b = 10.085(3) Å, c = 12.691(3) Å, α = 73.52(2)°,β = 86.05(2)°, γ = 76.43(2)°, V = 1089.7(5) Å3, and Z = 2 and II belongs to trigonal(rhombohedral) crystal system, space group R3̄m (No. 166) with a = 8.9590(9) Å, c = 34.795(2) Å, V = 2418.6(4) Å3, and Z = 3. Both compounds possess new structure types. Thestructure of I is composed of one-dimensional Zintl chains of alternating edge-sharing MTe4(M = Cd, Sn) tetrahedra and [Mn(en)3]2+ complex cations that are between the chains. Thestructure of II contains two-dimensional double layers of Ag6Sn2Te82- formed by connectingtwo single honeycomb-like layers through M−Te bonds (M = Ag, Sn). The double layers areseparated by the [Mn(en)3]2+ templates. Optical diffuse reflectance measurements have beenperformed on the powder samples of I and II and have suggested that both compounds aresemiconductors with band gaps of 1.75 and 0.77 eV, respectively.
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