Lim Hyung Kyu, Choi Young Sun, Hong Seung Tae
LG CHEM Research Park, Daejeon 305-380, Republic of Korea.
Acta Crystallogr C. 2011 Jun;67(Pt 6):i36-8. doi: 10.1107/S0108270111015861. Epub 2011 May 5.
The previously unknown crystal structure of magnesium perchlorate anhydrate, determined and refined from laboratory X-ray powder diffraction data, represents a new structure type. The title compound was obtained by heating magnesium perchlorate hexahydrate at 523 K for 2 h under vacuum and it crystallizes in the monoclinic space group P2(1)/c. The asymmetric unit contains one Mg (site symmetry -1 on special position 2a), one Cl and four O sites (on general positions 4e). The structure consists of a three-dimensional network resulting from the corner-sharing of MgO(6) octahedra and ClO(4) tetrahedra. Each MgO(6) octahedron share corners with six ClO(4) tetrahedra. Each ClO(4) tetrahedron shares corners with three MgO(6) octahedra, with one O-atom corner dangling. The ClO(4) tetrahedra are oriented in such a way that one-dimensional channels parallel to [100] are formed between the dangling O atoms.
通过实验室X射线粉末衍射数据确定并精修的无水高氯酸镁的未知晶体结构代表了一种新的结构类型。标题化合物是通过在真空下于523 K加热六水合高氯酸镁2小时获得的，它结晶于单斜空间群P2(1)/c中。不对称单元包含一个Mg（位于特殊位置2a上的位点对称性为-1）、一个Cl和四个O位点（位于一般位置4e上）。该结构由MgO(6)八面体和ClO(4)四面体通过角共享形成的三维网络组成。每个MgO(6)八面体与六个ClO(4)四面体共享角。每个ClO(4)四面体与三个MgO(6)八面体共享角，有一个O原子角悬空。ClO(4)四面体的取向使得在悬空的O原子之间形成平行于[100]的一维通道。
