稀土离子与二棕榈酰磷脂酰胆碱相互作用的FT—IR研究

利用傅里叶变换红外光谱法研究了稀土离子Ｓｍ３＋、Ｇｄ３＋、Ｅｒ３＋和Ｙｂ３＋与二棕榈酰磷脂酰胆碱脂质体的相互作用．结果表明：稀土离子同磷脂极性头部的Ｐｏ２－和Ｎ＋（ＣＨ３）３基团间有较强的静电作用，而且这些作用随着稀土离子摩尔比例的增大而加强．稀土离子与磷脂相互作用程度按稀土离子原子序数增大即Ｓｍ＜３＋＜Ｇｄ３＋＜Ｅｒ３＋＜Ｙｂ３＋的顺序排列.

A NOVEL DESIGN OF LIGHT-TRANSPARENT GOLD-MINIGRID THIN-LAYER FTIR SPECTROELECTROCHEMICAL CELL WITH VERTICAL CONFIGURATION

A Teflon bridge/edge-eliminator is designed to connect a glass container and a light-transparent gold-minigrid NaCl thin-layer cell to form a vertically configured in-situ FTIR spectroelectrochemical cell. The bridge/edge-eliminator sets an internal reference point for accurate potential control. The size of the thin-layer chamber is 5 X 5 X 0.11mm. A 1900-omega formal resistance of the thin-layer cell was measured in CH2Cl2/0.1 M TBAP solution. Well defined thin-layer cyclic voltammograms and IR spectral changes for ferrocene oxidation were obtained.

FTIR study of CO and NO adsorbed on nitrided CoMo/Al2O3 catalysts

The states of surface Co and Mo sites on nitrided CoMo supported on Al2O3 were studied by adsorption of CO and NO as IR probe molecules. Three IR bands at 2200, 2060 and 2025 cm(-1) were detected for adsorbed CO. These bands can be respectively attributed to the surface NCO species as a result of CO adsorbed on surface N sites, and linearly adsorbed CO on surface Co and Mo sites in low valence states. The addition of cobalt to the Mo nitride diminishes the band at 2200 cm(-1). This may be due to either the change of the surface structure of the supported nitride, or the formation of a new phase, CoxMoyNz, as suggested in the literature Kim et al., Catal. Lett., 1997, 43, 91 and Logan et al., Catal. Lett., 1998, 56, 165. Comparison of CO and NO adsorption on Mo2N/Al2O3 and CoMoNx/Al2O3 indicates that the presence of cobalt can promote the reduction and nitridation of Mo.