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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Crystal Structured and ~(166)Er Mossbauer Spectra for Some beta-Diketonatoerbium (III) Complexes
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Crystal Structured and ~(166)Er Mossbauer Spectra for Some beta-Diketonatoerbium (III) Complexes

机译:某些β-二酮体er(III)配合物的晶体结构和〜(166)Er Mossbauer光谱

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The crystal structures and ~(166)Er Mossbauer spectra for some beta-diketonatoerbium (III) complexes have been investigated. The geometries around the Er(III) ions in [Er(dpm)_3(H_2O)](1; Hdpm = 2,2,6,6-tetramethyl-3,5-heptanedione), [Er(pta)_3(H_2O)](2; Hpta = 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione) and [Er_2(pta)_6](3) are distorted monocapped trigonal prisms. 3 is a dimeric structure in which one of the chelating oxygen atoms of the pta ligand bridges between the Er(pta)_3 fragments. The ~(166)Er Mossbauer spectra for those beta-diketonatoerbium (III) complexes show paramagnetic relaxation patterns at 12 K. The estimated relaxation time (tau) is spread out from 0.1 to 1 ns. For the seven-coordinated complexes, tau decrease among with a decrease in the Er(III)-Er(III) distance. tau for the six - coordinated complex of [Er(dpm)_3] is as short as 0.4 ns in spite of having a rather long distance of Er(III)-Er(III) ions, suggesting that the tau also depends on the coordination number.
机译:研究了某些β-二酮基ton(III)配合物的晶体结构和〜(166)Er Mossbauer光谱。 [Er(dpm)_3(H_2O)](1; Hdpm = 2,2,6,6-四甲基-3,5-庚二酮),[Er(pta)_3(H_2O)中的Er(III)离子周围的几何)](2; Hpta = 1,1,1-三氟-5,5-二甲基-2,4-己二酮)和[Er_2 [pta_6](3)是扭曲的单峰三角形棱镜。图3是二聚体结构,其中pta配体的螯合氧原子之一在Er(pta)_3片段之间桥接。这些β-二酮基ton(III)配合物的〜(166)Er Mossbauer光谱在12 K处显示顺磁性弛豫模式。估计的弛豫时间(tau)从0.1 ns扩展到1 ns。对于七个配位的配合物,tau减小,而Er(III)-Er(III)距离减小。尽管Er(III)-Er(III)离子的距离相当长,但[Er(dpm)_3]的六配位络合物的tau却短至0.4 ns,这表明tau也取决于配位数。

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