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某些顺磁性镧系化合物能使有机物分子在溶液中产生很大的核磁谱位移。第一个核磁位移试剂是Hinkley发现的Eu(dpm)_3·2Py加合物。立即引起人们广泛的重视和浓厚的兴趣。1970年Sanders和Willims发现Eu(dpm)_3是更好的核磁位移试剂。目前稀土离子β-二酮螯合物已成为重要的核磁位移试剂。一般研究三配位体螯合的稀土络合物较多,而四个β-二酮与稀土离子络合的化合物研究很少。在噻吩甲酰三氟丙酮合镧螯合物(TTA)_4LaQH中,La~(3+)呈现高配位数,组分内有4个双齿配位体及一个喹啉分子,因而在空间及
Some paramagnetic lanthanide compounds can make organic molecules in the solution to produce a large nuclear magnetic shift. The first NMR reagent is Eu (dpm) _3 · 2Py adduct from Hinkley. Immediately aroused widespread attention and strong interest. In 1970, Sanders and Willims found that Eu (dpm) _3 is a better NMR reagent. At present, rare earth ion β-diketone chelate has become an important nuclear magnetic shift reagent. It is generally found that there are many rare earth complexes chelated by the three ligands, while few compounds have been studied for the complexation of four β-diketones with rare earth ions. In the so-called TTA_4LaQH, La ~ (3+) exhibits a high coordination number and has 4 bidentate ligands and one quinoline molecule in the TTA_4LaQH, and