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Structure and bonding in some Gd(III) metal complexes studied by three-dimensional X-ray analysis and Gd-155 Mossbauer spectroscopy
Wang Junhu1; Masashi, Takahashi2; Takafunmi, Kitazawa2; Masuo, Takeda2
关键词Gd(Iii) Metal Complex Crystal Structure Bonding Gd-155 Mossbauer Spectroscopy Three-dimensional X-ray Analysis Covalent Contribution Rare Earths
刊名JOURNAL OF RARE EARTHS
2007-12-01
25期:6页:647-653
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Chemistry, Applied
研究领域[WOS]Chemistry
关键词[WOS]CRYSTAL-STRUCTURE ; ISOMER-SHIFTS ; GADOLINIUM ; PRASEODYMIUM ; SPECTRA
英文摘要Some functional lanthanide metal complexes, such as acetylacetonato complexes, ethylenediaminetetraacetato complexes, were successfully applied for diagnostic technique. The authors are interested in investigating the structure and bonding in lanthanide and actinide metal complexes Using Er-166, Gd-155, and Np-217 Mossbauer spectroscopies in connection with single-crystal and/or powder X-ray diffraction, making clear the differences on their structures as well as the differences in the participation of 4f and 5f orbitals in the chemical bonds. In this article, the crystal structures of two novel Gd(III) acetylacetonato complexes, Gd(pta)(3) center dot 2H(2)O (pta = 1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedione) and Gd(bfa)(3) center dot 2H(2)O (bfa = 1, 1, 1 -trifluoro-4-phenyl-2-4-butanedione) were reported. Though both of them were dihydrate and had distorted square antiprismatical structure, Gd(pta)(3) center dot 2H(2)O crystallizes in the P 2(1)/n (#14) monoclinic space group and its lattice parameters are a = 1.4141(6) rim, b = 1.0708(3) nm, c =2.2344(4) nm, beta =95.24(2)degrees , and Gd(bfa)(3) center dot 2H(2)O crystallizes in P 2,2,2, orthorhombic space group and its lattice parameters were a = 1.322(l) rim, b = 2.295 (1) rim, c = 1.0786(8) nm. In the meantime, the authors had finished a systematic investigation on the Gd-155 Mossbauer isomer shift (delta) of various Gd(III) metal complexes having a different coordination number (C.N.) and different ratios coordinating oxygen to nitrogen. A tendency for the 8 value to decrease with an increase in the C.N, and the number of the nitrogen atom coordinating to Gd was confirmed. This indicated that the Gd-O and/or Gd-N bond in the investigated Gd(M) metal complexes had a small covalent contribution, which was possible to be deduced from the O and/or N atoms of the ligands donating electrons to 6s, 5d, and 4f orbitals of Gd.
语种英语
WOS记录号WOS:000252410000001
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/140413
专题中国科学院大连化学物理研究所
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Toho Univ, Fac Sci, Dept Chem, Chiba 2748510, Japan
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Wang Junhu,Masashi, Takahashi,Takafunmi, Kitazawa,et al. Structure and bonding in some Gd(III) metal complexes studied by three-dimensional X-ray analysis and Gd-155 Mossbauer spectroscopy[J]. JOURNAL OF RARE EARTHS,2007,25(6):647-653.
APA Wang Junhu,Masashi, Takahashi,Takafunmi, Kitazawa,&Masuo, Takeda.(2007).Structure and bonding in some Gd(III) metal complexes studied by three-dimensional X-ray analysis and Gd-155 Mossbauer spectroscopy.JOURNAL OF RARE EARTHS,25(6),647-653.
MLA Wang Junhu,et al."Structure and bonding in some Gd(III) metal complexes studied by three-dimensional X-ray analysis and Gd-155 Mossbauer spectroscopy".JOURNAL OF RARE EARTHS 25.6(2007):647-653.
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