首页> 美国卫生研究院文献>Acta Crystallographica Section E: Crystallographic Communications >Crystal structure of the Anderson-type hetero­polyoxometalate; K2H7CrIIIMo6O24·8H2O: a redetermination revealing the position of the extra H atom in the polyanion
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Crystal structure of the Anderson-type hetero­polyoxometalate; K2H7CrIIIMo6O24·8H2O: a redetermination revealing the position of the extra H atom in the polyanion

机译:安德森型杂多金属氧酸盐的晶体结构; K2 H7CrIIIMo6O24·8H2O:重新测定揭示了额外H原子在聚阴离子中的位置

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摘要

The title compound contains a symmetric hydrogen bond in which the H atom does not lie on a crystallographic centre of symmetry. The structure of K2[H7CrIIIMo6O24]·8H2O, namely dipotassium hepta­hydrogen hexa­molybdochromate(III) octa­hydrate, previously reported by Lee [Acta Cryst. (2007), E>63, i5–i7], has been redetermined in order to locate the position of the seventh H atom in the anion. Six of the H atoms are bonded to the six μ3-O atoms and form hydrogen bonds of medium strength either to water mol­ecules or to the terminal O atoms of other polyanions. The seventh H atom forms a very short hydrogen bond between two μ2-O atoms on adjacent polyanions. This short bond, together with two normal hydrogen bonds, link the two crystallographically distinct centrosymmetric polyanions into chains along [011], while the length of this bond [2.461 (3) Å] suggests that the H atom lies at its centre, but unusually for such a bond, this point is not a crystallographic centre of symmetry.
机译:标题化合物含有对称氢键,其中H原子不位于结晶学对称中心。 Lee [Acta Cryst.Chem.Soc。,2001,8,5]中报道了K 2 [H 7 CrⅢMo 6 O 24]·8H 2 O的结构,即七水合六氢铬酸二钼酸钾。 (2007),E > 63 ,i5-i7],以便确定阴离子中第七个H原子的位置。六个H原子与六个μ3-O原子键合,并形成中等强度的氢键与水分子或与其他聚阴离子的末端O原子结合。第七个H原子在相邻的聚阴离子上的两个μ2-O原子之间形成非常短的氢键。该短键与两个正常氢键一起,将两个在晶体学上不同的中心对称聚阴离子沿着[011]链接成链,而该键的长度[2.461(3)Å]表明H原子位于其中心,但与众不同对于这种键,该点不是晶体学的对称中心。

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