Synthesis, Structure And Properties Of Polymetal Selenide/Tellurium Containing Organic Ligand

The subject is to synthesis and analyze the structure and properties of polymetal selenide containing organic ligand. By now the polymetal selenides have been the hot-point in solid chemistry because their special physical and chemical characters result from low-dimension structures which have great applicated prospects and many potential economic benefits. In this dissertation, We did the summarize the development of multi-component metal chalcogenides. Besides, we did analysis, study and induce synthesis methods, structure rules and characters applications of such compounds.low-temperatur Solvothermal technique growth often produce compounds which have low-demension structures(i.e.0-D,1-D, 2-D) which is metastable state in thermodynamics. We have done some research on the new orientation of synthesis-solvothermal technique to synthesis compound AxMyLnM'y'Qz in which M = transitional metal, M' = main-group metal, Q = S, Se, Te; L = poly-teeth-organic- ligend, according to ideas of molecule designing. By many experiments twelve new chalcogenide cystals have been synthesized in which (enH)2(enH2)Sn2Se6 and [Mn(en)3]2·Sn2Se4Te2 have both been determinded by single crystal X-ray diffraction. (enH)2(enH2)Sn2Se6 belongs to triclinic space group P ī with the unit cell parameters, a = 0.8659 (2) nm, b =1.1055(2) nm, c= 0.66360(10) nm, α = 104.44(3)?, β = 110.93(3) ?, γ = 79.74(3) ?, V=0.57178(19) nm-3, Z = 1. The crystal which contains separate (Sn2Se6)4- ,(enH2)2+ and (enH)+ is pileuped by electrostatic power. [Mn(en)3]2·Sn2Se4Te2 belong to triclinic space group with the unit cell parameters, a = 9.1428(7)?, b = 10.2781(7) ?, c = 11.5745(8) ?, V = 943.82(12) ?3, Z = 1. The crystal which contains separate (Sn2Se4Te2)4- 和[Mn(en)3]2+ is pileuped by electrostatic power. Studies on diffuse reflective spectra for the both powder samples suggested that this compound is semiconductor, with a band gap of (enH)2(enH2)Sn2Se6(Eg) = 1.76 eV and [Mn(en)3]2·Sn2Se4Te2 (Eg) = 2.2 eV. The result of TG analysis indicated that both (enH)2(enH2)Sn2Se6 and [Mn(en)3]2·Sn2Se4Te2 have high thermal stability.