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Powder X-ray diffraction data for dimethylarsinic acid, (CH_3)_2AsO(OH)

机译:二甲基胂酸的粉末X射线衍射数据,(CH_3)_2ASO(OH)

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摘要

Synchrotron powder diffraction data is presented for the monoclinic polymorph of dimethylarsinic acid, (CH3)(2)AsO(OH) (DMA(V)). Rietveld refinement with GSASII yielded lattice parameters of a = 15.9264(15) angstrom, b = 6.53999(8) angstrom, c = 11.3401(9) angstrom, and beta = 125.8546(17)degrees (Z = 8, space group C2/c). The Rietveld-refined structure was compared with both a density functional theory (DFT)-optimized structure and the published, low-temperature single-crystal structure, and all three structures exhibited excellent agreement. The triclinic polymorph of DMA(V) was also DFT optimized with CRYSTAL17 to determine the positions of the hydrogen atoms. Monoclinic DMA(V) forms zigzag chains parallel to the b-axis with adjacent DMA(V) molecules connected by an O-HMIDLINE HORIZONTAL ELLIPSISO bond, whereas triclinic DMA(V) forms dimers connected by two O-HMIDLINE HORIZONTAL ELLIPSISO bonds.
机译:Syschrotron粉末衍射数据用于二甲基胂酸的单斜晶型多晶型物,(CH 3)(2)aso(OH)(DMA(V))。 利用GSASII的细化产生次亮度参数A = 15.9264(15)埃,B = 6.53999(8)埃,C = 11.3401(9)埃,β= 125.8546(17)度(Z = 8,空间组C2 / C )。 将RIETVELD精致的结构与密度泛函理论(DFT) - 优化的结构和公布的低温单晶结构进行比较,并且所有三种结构都表现出很好的一致性。 DMA(V)的三级多晶型物也与晶体17进行了DFT,以确定氢原子的位置。 单斜晶DMA(V)形成平行于B轴的Zigzag链,其具有由O-Hmidline水平椭圆键连接的相邻DMA(V)分子,而三级DMA(V)形成通过两个O-Hmidline水平椭圆粘度键连接的二聚体。

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