IR AND RAMAN-SPECTRA STUDIES OF THE RARE EARCH COMPLEXES WITH GLUTATHIONE

The complexes of rare earth ions with glutathione were prepared and charactrized by IR and Raman spectroscopy in the solid state. Based on the spectral results, the structure and coordination sites of the ligand in these complexes were determined.

稀土谷胱甘肽配合物红外和Raman光谱研究

谷胱甘肽是广泛存在于体内的重要三肽,在体内主要以还原型(GSH)存在,其中血液红细胞内浓度高达2mmol·L~(-1)。GSH不但是清除体内过氧化物的还原剂,而且与某些金属的配合物具有酶活性,有重要的生理生化功能,成为生物无机化学研究的重要课题。随着稀土的广泛应用,稀土的生物效应已引起广泛关注。研究稀土与GSH的配合物结构和性质,将有利于了解稀土在体内的代谢和作用。个别稀土与GSH在溶液中的配合物生成虽有报道,但系列稀土配合物的光谱和结构迄今未被研究。我们合成了十五种稀土与GSH的固体配合物,用IR和Raman光谱研究了配体在配合物中的变化及与稀土的配合位置。

Characterization of iron atoms in the framework of MFI-type zeolites by UV resonance Raman spectroscopy

Silicalite-I, ZSM-5, and Fe-ZSM-5 zeolites prepared from two different silicon sources are characterized by UV resonance Raman (UVRR) spectroscopy, X-ray diffraction (XRD), electron spin resonance (ESR), and UV/visible diffuse reflectance spectroscopy (UV/Vis DRS). A new technique for investigating zeolitic structure, UV resonance Raman spectroscopy selectively enhances the Raman bands associated with framework iron atoms incorporated into MFI-type zeolites, and it is very sensitive in identifying the iron atoms in the framework of zeolites, while other techniques such as XRD, ESR, and UV/Vis DRS have failed in uncovering trace amounts of iron atoms in the framework of zeolites. (C) 2000 Academic Press.