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In 32A Lewis, the primary instruments at CHEXRAY are a Bruker/Nonius SMART CCD area-detector diffractometer and a Bruker APEX CCD area-detector. Each are equipped with a nitrogen-flow low-temperature apparatus. These are the primary instruments for data collection and are used by the crystallographer and by other authorized users. Three polarizing microscopes, one with a video camera, are used to evaluate crystal quality, and are open to use by all people in the College of Chemistry. There are also two X-ray generators with precession cameras.
CHEXRAY only performs single-crystal analyses. CHEXRAY shares 32A Lewis with an X-ray generator and powder diffraction cameras which belong to Prof. Jeffrey Long. and Prof. Angelica Stacy also has an X-ray powder diffractometer which is located in 521 Latimer. These are private-use instruments and not part of the CHEXRAY Facility. In 32 Lewis are the computers and terminals used to analyze the X-ray data. There are three X-terminals , all of which can log on to the microVAX, the Alphastation, the SGI O 2 workstation or the Linux server PC. These control the structure solution software and can show ORTEP diagrams of the molecules. Currently installed software includes TeXsan from Molecular Structure Corporation and SHELXTL from Bruker. Molecular plots can also be printed out on the laser printers or plotted on the inkjet color plotter or transferred to the dye sublimation plotter in the Graphics Lab. Structures can also be transferred to the Tektronix CAChe system and displayed on the 3-D monitor or used as a basis for molecular mechanics calculations. CHEXRAY also maintains the Cambridge Structural Database for access by anyone in the College of Chemistry. Manuals for its use are located in 32 Lewis. Use of the CSD is free to all academic users. The X-window terminals allow for access in 32 Lewis, or the CSD can be called up via remote login across the ethernet connections within the College. The CSD can be used for convenient literature searches for known structures and can be used as a source of coordinates to use as starting points for modelling. Coordinate files from the CSD can be easily transferred to the CAChe, the Graphics Facility, or your own computer. |
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