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Crystal structure and spectroscopic properties of trans-dibromobis(1,2- ethanediamine)chromium(III) perchlorate

机译:反式二溴双(1,2-乙二胺)铬(III)的晶体结构和光谱性质

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The crystal structure of trans-[Cr(en)_2Br_2]ClO _4 (en = 1,2-ethanediamine) has been determined by a singlecrystal X-ray diffraction study at 150 K. The complex crystallizes in the space group P1? of the triclinic system with two mononuclear formula units in a cell of dimensions a = 6.853(4), b = 8.109(5), c = 12.475(8) ?, α = 81.006(10)°, β = 77.005(10)° and γ = 74.981(10)°. The Cr atom is in a slightly distorted octahedral environment, coordinated by four nitrogen atoms of two en ligands and two bromine atoms in trans axial positions. The mean Cr-N(en) and Cr-Br bond lengths are 2.079(3) and 2.4743(10)?, respectively. The five-membered rings are in stable gauche conformations with N1-Cr1-N2 and N3-Cr2-N4 angles of 82.81(11)° and 83.67(11)°, respectively. The crystal packing is stabilized by a network of N-H?O and N-H?Br hydrogen bonds. The infrared and electronic absorption spectra are consistent with the results of X-ray crystallography.
机译:反式-[Cr(en)_2Br_2] ClO_4(en = 1,2-乙二胺)的晶体结构已通过150 K的单晶X射线衍射研究确定。该配合物在空间群P1?2中结晶。单元尺寸为a = 6.853(4),b = 8.109(5),c = 12.475(8)?,α= 81.006(10)°,β= 77.005(10)的单元格中具有两个单核分子式单元的三斜晶系°和γ= 74.981(10)°。 Cr原子处于稍微扭曲的八面体环境中,由两个en配体的四个氮原子和反式轴向位置的两个溴原子配位。 Cr-N(en)和Cr-Br平均键长分别为2.079(3)和2.4743(10)?。五元环呈稳定的构象构型,其N1-Cr1-N2和N3-Cr2-N4角分别为82.81(11)°和83.67(11)°。晶体堆积通过N-H 2 O和N-H 2 Br氢键的网络稳定。红外和电子吸收光谱与X射线晶体学的结果一致。

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