Solution studies of lanthanide (III) complexes based on 1,1,1,5,5,5-hexafluoro-2,4-pentanedione and 1,10-phenanthroline Part-I: Synthesis, 1H NMR, 4f–4f absorption and photoluminescence
作者： Zubair Ahmed , K. Iftikhar
DOI: 10.1016/J.ICA.2010.04.040
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摘要: Abstract Solution studies on the complexes of type [Ln(hfaa)3(phen)2] (Ln = La, Pr and Nd) [Ln(hfaa)3phen] (Ln = Nd, Ho, Er Yb; hfaa stands for anion 1,1,1,5,5,5-hexafluoro-2,4-pentanedione phen 1,10-phenanthroline) are presented. These synthesized in high yields by an situ method which hfaa, ammonium hydroxide, lanthanide chlorides were allowed to react 3:3:1:1 molar ratio ethanol. In case neodymium both eight- ten-coordinate isolated. The paramagnetic shifts methine protons β-diketone have their sign opposed those dominated dipolar interactions. inter- intramolecular shift ratios been calculated discussed. 4f–4f absorption spectra Pr, Nd, Ho analyzed. display distinctively different band shapes 4G5/2,2G7/2 ← 4I9/2 hypersensitive transition. efficient energy transfer from ligand Pr(III) is reflected strong red luminescence this complex at room temperature.
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