Spectroscopy and crystal structure of neodymium coordination compound with glycine: Nd2(Gly)6·(ClO4)6·9H2O |
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Authors: | J Legendziewicz E Huskowska A Wa?kowska Gy Argay |
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Institution: | Institute of Chemistry, University of Wroc?aw, 50-380 Wroc?;aw Joliot-Curie 14, Poland;Institute for Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroc?aw, Pl. Katedralny 1, Poland;Central Research Institute for Chemistry, Hungarian Academy of Sciences, Budapest-114, POB. 17, H-1525 Hungary |
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Abstract: | Neodymium complex compound with glycine: Nd2(Gly)6·(ClO46·9H2O was synthesized and obtained in the form of monocrystals. Absorption spectra recorded in the region of 8000–35 000 cm-1 were measured along the crystallographic axes. Intensities of the f-f transitions were analysed on the basis of the Judd theory. The X-ray crystal structure determination of the complex is reported. Crystals are triclinic, space group P, with a = 11.554(4) Å, b = 14.108(1) Å, c = 15.660(3) Å, α = 97.14(1)°, β = 102.82(2)°, γ = 105.28(1)°, V = 2355.25 Å3 Z = 2, M.W. = 1495.4, Dc = 2.129)(3) g cm-3, Dm = 2.103(1) g cm-3. The structure was solved by Patterson's method and successive Fourier syntheses giving the locations of all nonhydrogen atoms. The final R factor was 0.062 and Rw = 0.073 for 12869 reflections with |Fo| > 5σ|(Fo)|. The asymmetric unit consists of a dimeric formula unit. The coordination polyhedron of Nd atoms comprises seven oxygen atoms from glycine and two from water molecules. The neodymium-glycine bonding mode is compared with that of the calcium-glycine complex. |
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Keywords: | Author to whom all correspondence should be addressed |
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