화학공학소재연구정보센터
Inorganic Chemistry, Vol.44, No.15, 5447-5458, 2005
Controlled synthesis of ternary II-II'-VI nanoclusters and the effects of metal ion distribution on their spectral properties
The reaction of [(3,5-Me-2-C5H3N)(2)Zn(ESiMe3)(2)] (E = Se, Te) with cadmium(II) acetate in the presence of PhESiMe3 and p(n)Pr(3) at low temperature leads to the formation of single crystals of the ternary nanoclusters [ZnxCd10-xE4-(EPh)(12)((PPr3)-Pr-n)(4)] [E = Se, x = 1.8 (2a), 2.6 (2b); Te, x = 1.8 (3a), 2.6 (3b)] in good yield. The clusters [Zn3Hg7-Se-4(SePh)(12)((PPr3)-Pr-n)(4)] (4) and [Cd3.7Hg6,3Se4(SePh)(12)((PPr3)-Pr-n)(4]) (5) can be accessed by similar reactions involving [(3,5-Me-2-C5H3N)(2)Zn(SeSiMe3)(2)] or [(N,N'-tmeda)Cd(SeSiMe3)(2)] (1) and mercury(II) chloride. The metal silylchalcogenolate reagents are efficient delivery sources of {ME2} in cluster synthesis, and thus, the metal ion content of these clusters can be readily moderated by controlling the reaction stoichiometry. The reaction of cadmium acetate with [(3,5-Me-2-C5H3N)(2)Zn(SSiMe3)(2)], PhSSiMe3, and p(n)Pr(3) affords the larger nanocluster [Zn2.3Cd14.7S4(Sph)(26)((PPr3)-Pr-n)(2)] (6). The incorporation of Zn(II) into {Cd10E} (E = Se, Te) and Zn(II) or Cd(II) into {Hg10Se} nanoclusters results in a significant blue shift in the energy of the first "excitonic" transition. Solid-state thermolysis of complexes 2 and 3 reveals that these clusters can be used as single-source precursors to bulk ternary ZnxCd1-xE materials as well as larger intermediate clusters and that the metal ion ratio is retained during these reactions.