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首页> 外文期刊>Inorganic Chemistry Communications >Structural characterization and conformational analysis of (aqua) (ethylenediamine-N,N,N'-triacetato) chromium (III) monohydrate complex. Crystal structure of the cis-equatorial isomer of [Cr(ed3a)(H_2O)]·H_2O
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Structural characterization and conformational analysis of (aqua) (ethylenediamine-N,N,N'-triacetato) chromium (III) monohydrate complex. Crystal structure of the cis-equatorial isomer of [Cr(ed3a)(H_2O)]·H_2O

机译:(水)(乙二胺-N,N,N'-三乙酸根)一水合铬(III)配合物的结构表征和构象分析。 [Cr(ed3a)(H_2O)]·H_2O的顺-赤道异构体的晶体结构

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The structure of the cis-equatorial isomer of [Cr(ed3a)(H_2O)]·H_2O (ed3a=ethylenediamine-N,N,N'-triacetate ion) was determined by X-ray diffraction method.The complex crystallizes in the monoclinic space group P2_1,a=7.004(1) A,b=15.958(2)A,c=11.046(1) A, beta=97.16(1) deg, and Z=4.Conformational analysis of the three possible geometrical isomers,trans(H_2O,N'),trans(H_2O,N_H),and trans(H_2O,O)of [Cr(ed3a)(H_2O)]moiety,performed using the consistent force field (CFF) program with the recently developed parameters for EDTA-type complexes,yielded structural details and energies of the minimized form for each of the isomers.Calculated energies showed that the cis-eq isomer is the most stable one,with the geometry in a very good agreement with the crystallographic structure.Comparison of the molecular mechanics calculations with those for the analogous[Cr(ed3p)(H_2O)]·H_2O (ed3p=ethylenediamine-N,N,N'-tripropionate ion) revealed some general patterns for the conformational preference of EDTA-type complexes.
机译:用X射线衍射法测定[Cr(ed3a)(H_2O)]·H_2O(ed3a =乙二胺-N,N,N'-三乙酸根离子)的顺-赤道异构体的结构,该配合物在单斜晶中结晶空间组P2_1 / n,a = 7.004(1)A,b = 15.958(2)A,c = 11.046(1)A,beta = 97.16(1)deg,Z = 4。三种可能几何形状的构象分析[Cr(ed3a)(H_2O)]部分的异构体,反式(H_2O,N'),反式(H_2O,N_H)和反式(H_2O,O),是使用最新开发的一致力场(CFF)程序进行的EDTA型配合物的参数,得到的结构细节和每个异构体的最小化形式的能量。计算的能量表明,顺式当量异构体是最稳定的,其几何形状与晶体结构非常吻合。分子力学计算与类似物[Cr(ed3p)(H_2O)]·H_2O(ed3p =乙二胺-N,N,N'-三丙酸根离子)的分子力学计算比较,揭示了一些构象偏爱的一般模式EDTA型复合物。

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