Acquisition and Upgrade of X-ray Diffractometers at the University of Maryland

这份来自化学研究仪器和设施（CRIF）项目和主要研究仪器（MRI）项目的合同将使马里兰大学化学和生物化学系、物理和材料工程系获得CCD单晶x射线衍射系统、可变温度阶段的粉末x射线衍射系统，并升级现有的衍射仪。这种设备将加强若干领域的研究，包括：(1)固体硫化物、硒化物和氧硫化物的合成、结构和性质；(2)过渡金属插入p嵌段多阴离子的研究；(3)掺杂稀土锰钙钛矿中“巨”磁阻的研究；(4)金属-硫金属酸盐在缺氧地下水中有害金属迁移中的协同性研究；(5)自组装离子载体的研究；(6)有机金属化学和合成方法。x射线衍射仪用于对分子的完整三维结构进行精确的测量。所获得的信息给出了给定分子的所有键距和键角的精确值，并给出了分子相对于邻近分子的空间排列的准确信息。

This award from the Chemistry Research Instrumentation and Facilities (CRIF) Program and the Major Research Instrumentation (MRI) Program will enable the Departments of Chemistry and Biochemistry, Physics and Materials Engineering at The University of Maryland in College Park to acquire a CCD single crystal X-ray diffraction system, a powder X-ray diffraction system with variable temperature stage, and to upgrade an existing diffractometer. This equipment will enhance research in a number of areas including the following: (1) synthesis, structures and properties of solid state sulfides, selenides and oxysulfides, (2) insertion studies of transition metals into p-block polyanions, (3) studies of `colossal` magnetoresistance in doped rare-earth manganese perovskites, (4) studies of metal-thiometalate cooperativity in the transport of hazardous metals in anoxic ground waters, (5) self-assembled ionophores, and (6) organometallic chemistry and synthetic methods. The X-ray diffractometer is used to make accurate and precise measurements of the full three dimensional structure of a molecule. The information obtained gives the precise values of all the bond distances and bond angles of a given molecule and it gives accurate information about the spatial arrangement of the molecule relative to the neighboring molecules.