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首页> 外文期刊>Journal of chemical crystallography >Unique coordination in metal nitroprussides: The structure of Cu[Fe(CN)(5)NO]center dot 2H(2)O and Cu[Fe(CN)(5)NO]
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Unique coordination in metal nitroprussides: The structure of Cu[Fe(CN)(5)NO]center dot 2H(2)O and Cu[Fe(CN)(5)NO]

机译:金属硝普盐中的独特配位:Cu [Fe(CN)(5)NO]中心点2H(2)O和Cu [Fe(CN)(5)NO]的结构

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The structures of copper pentacyanonitrosylferrate dihydrate, Cu[Fe(CN)(5)NO].2H(2)O, and anhydrous, Cu[Fe(CN)(5)NO], have been determined from their XRD powder patterns and refined using the Rietveld method. The dihydrate structure was solved by direct methods and the anhydrous one was elucidated by chemical intuition. Cu[Fe(CN)(5)NO].2H(2)O is orthorhombic, space group Amm2 (38) and Z=2. In this structure the iron is coordinated to five CN and a NO ligand, while the copper atom is coordinated, in a unique fashion, to four equatorial CN groups at N ends and two water molecules. Cu[Fe(CN)(5)NO] is tetragonal, space group I4 mm (107) and Z=2. This structure is obtained from the dehydration of the orthorhombic one; reordering allows the Cu atom to coordinate not only to the four equatorial cyanides but also to the axial cyanide. The coordination of the iron atom remains as in the orthorhombic structure. Agreement factor obtained from the final refinement were as follows: R-wp=5.10 and R-B=4.57 for the orthorhombic structure and R-wp=6.52 and R-B=7.82 for the tetragonal one. These crystal structures are also supported by IR and Mossbauer spectroscopic data and thermogravimetry.
机译:从其XRD粉末图案确定了五水合亚硝酸五水合亚硝酸铜铜(Cu [Fe(CN)(5)NO] .2H(2)O和无水Cu [Fe(CN)(5)NO]的结构并对其进行了精制使用Rietveld方法。通过直接方法解析二水合物的结构,并通过化学直觉阐明无水结构。 Cu [Fe(CN)(5)NO] .2H(2)O是正交晶,空间群Amm2(38)和Z = 2。在这种结构中,铁与五个CN和一个NO配体配位,而铜原子以独特的方式与N端的四个赤道CN基团和两个水分子配位。 Cu [Fe(CN)(5)NO]是四方的,空间群为I4 mm(107),Z = 2。这种结构是通过正交晶的脱水得到的。重排使得Cu原子不仅与四个赤道氰化物配位,而且与轴向氰化物配位。铁原子的配位保持在正交结构中。从最终改进中获得的一致性因子如下:对于正交结构,R-wp = 5.10,R-B = 4.57,对于四方结构,R-wp = 6.52,R-B = 7.82。 IR和Mossbauer光谱数据和热重分析也支持了这些晶体结构。

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