Khan Azad A, Hussain H A, Iftikhar K
Department of Chemistry, Jamia Millia Islamia, New Delhi 110 025, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2003 Mar 15;59(5):1051-9. doi: 10.1016/s1386-1425(02)00277-9.
Absorption spectroscopic studies on the mixed-ligand complexes of Pr (III) and Nd (III) with 2,2'-bipyridyl and thiocyanate in pyridine, DMSO, DMF and methanol are presented. The oscillator strengths for the hypersensitive and non-hypersensitive transitions have been calculated and variation in the oscillator strength and band shapes with respect to solvent type is rationalized in terms of solvent structures and coordinating properties. A comparison is made with 1,10-phenanthroline complexes and has been shown that bpy is a weaker ligand than phen for these ions. Pyridine has been found most effective in promoting 4f-4f intensity and the increase in the oscillator strength in this solvent is due to dynamic ligand polarization mechanism.
本文介绍了镨（III）和钕（III）与2,2'-联吡啶和硫氰酸盐在吡啶、二甲基亚砜、二甲基甲酰胺和甲醇中的混合配体配合物的吸收光谱研究。计算了超灵敏跃迁和非超灵敏跃迁的振子强度，并根据溶剂结构和配位性质，解释了振子强度和能带形状随溶剂类型的变化。与1,10-菲咯啉配合物进行了比较，结果表明，对于这些离子，联吡啶是比菲咯啉更弱的配体。已发现吡啶在促进4f-4f跃迁强度方面最为有效，且该溶剂中振子强度的增加归因于动态配体极化机制。
