Rb4Hg5(Te-2)(2)(Te-3)(2)Te-3, [Zn(en)(3)](4)In-16(Te-2)(4)(Te-3)Te-22, and K2Cu2(Te-2)(Te-3): Novel metal polytellurides with unusual metal-tellurium coordination

摘要

Three novel metal polytellurides Rb4Hg5(Te-2)(2)(Te-3)(2)Te-3 (I), [Zn(en)(3)](4)In-16(Te-2)(4)(Te-3)Te-22 (II), and K2Cu2(Te-2)-(Te-3) (III) have been prepared by solvothermal reactions in superheated ethylenediamine at 160 degreesC. Their crystal structures have been determined by single-crystal X-ray diffraction techniques. Crystal data for I: space group Pnma, a = 9.803(2) Angstrom, b = 9.124(2) Angstrom, c = 34.714(7) Angstrom, Z = 4. Crystal data for II: space group C2/c, a = 36.814(7) Angstrom, b = 16.908(3) Angstrom ,c = 25.302(5) Angstrom, beta = 128.46(3)degrees, Z = 4. Crystal data for III: space group Cmcm, a = 11.386(2) Angstrom, b = 7.756(2) Angstrom, c = 11.985(2) Angstrom, Z = 4. The crystal structure of I consists of ID infinite ribbons of (1)(infinity)[Hg-5(Te-2)(2)(Te-3)(2)Te-3](4-), which are composed of tetrahedral HgTe4 and trigonal HgTe3 units connected through the bridging Te2-, (Te-2)(2-), and (Te-3)(2-) ligands. II is a layered compound containing InTe4 tetrahedra that share corners and edges via Te, Te-2, and Te-3 units to form a 2D slab that contains relatively large voids. The [Zn(en)(3)](2+) template cations are filled in these voids and between the slabs. The primary building blocks of III are CuTe4 tetrahedra that are linked by intralayer (Te-3)(2-) and interlayer (Te-2)(2-) units to form a 3D network with open channels that are occupied by the K+ cations. All three compounds are rare polytelluride products of solvothermal reactions that contain both Te-2 and Te-3 fragments with unusual metal-tellurium coordination. [References: 35]