A volatile Pb(II) β-Diketonate diglyme complex as a promising precursor for MOCVD of lead oxide films
摘要:
A polyether adduct of the lead(II) hexafluoro acetylacetonate has been synthesized and characterized by elemental analysis, NMR spectroscopy, mass spectrometry and infrared spectroscopy. The single crystal X-ray diffraction study provides evidence of a dimeric structure of the type [Pb(hfa)(2) (.) diglyme](2) (Hhfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, diglyme = CH3O(CH2CH2O)(2)CH3). The thermal analyses have revealed high volatility and good thermal stability with a low residue despite the dimeric nature of the adduct. This novel compound has been successfully applied as a precursor for the depositions of PbO films. It represents the first example of lead precursors that can be used in the liquid phase without decomposition, thus providing constant evaporation rates even for very long deposition times. (C) 2004 Elsevier B.V. All rights reserved.
A volatile Pb(II) β-Diketonate diglyme complex as a promising precursor for MOCVD of lead oxide films
摘要:
A polyether adduct of the lead(II) hexafluoro acetylacetonate has been synthesized and characterized by elemental analysis, NMR spectroscopy, mass spectrometry and infrared spectroscopy. The single crystal X-ray diffraction study provides evidence of a dimeric structure of the type [Pb(hfa)(2) (.) diglyme](2) (Hhfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, diglyme = CH3O(CH2CH2O)(2)CH3). The thermal analyses have revealed high volatility and good thermal stability with a low residue despite the dimeric nature of the adduct. This novel compound has been successfully applied as a precursor for the depositions of PbO films. It represents the first example of lead precursors that can be used in the liquid phase without decomposition, thus providing constant evaporation rates even for very long deposition times. (C) 2004 Elsevier B.V. All rights reserved.
Synthesis and structure of the diglyme-bridged lead hexafluoroacetylacetonate complex [Pb(hfac)2(μ-η3:η1-diglyme)]2
作者:William J. Evans、Daniel B. Rego、Joseph W. Ziller
DOI:10.1016/j.poly.2006.03.011
日期:2006.10
The hexafluoroacetylacetonate (hfac) chemistry of lead was investigated to make comparisons with the similarly sized lanthanides that form air stable Ln(hfac)(3)(diglyme) complexes. [Pb(hfac)(2)(mu-eta(3) :eta(1)-diglyme)]2 was obtained from PbO, (MeOCH2CH2)(2)O, and H(hfac) and was found to exist in the solid state as chiral pairs linked via diglyme. The metal is eight coordinate, but has sufficient vacant space in the coordination sphere to be considered to have an hemi-directed coordination environment. In contrast to the Ln(hfac)(3)(digyme)/K reactions that generate [LnF(hfac)(3)K(diglyme)](2) fluoride complexes, the potassium reduction of the lead complex gave only [(18-crown-6)K(hfac)](n) in pure form, a complex that,displays bridging CF3 linkages in the solid state. (c) 2006 Elsevier Ltd. All rights reserved.