I. Combinatorial studies for aluminophosphate molecular sieves. II. Hydrogermylation on hydride terminated germanium(100) surfaces
Abstract
In Part I, we describe an efficient methodology for the combinatorial synthesis of microporous, materials based on automatic dispensing of reagents into autoclave blocks followed by synthesis, isolation and automated structure analysis with X-ray diffractometry. The method is characterized by low reagent consumption and efficient sample recovery. The syntheses of the aluminophosphate phases using the above combinatorial strategies are described. The aluminophosphate study discusses the influence of combined organometallic and organic structure directing agents on the resulting phases (e.g., AFI, AEL and AST structure types), based on the different size and flexibility of the templating agents. Furthermore, the effects of the concentration of single templates, Al sources, and different templates as well as mixed template system on the crystallization of aluminophosphates are examined. In part II, we present novel strategies to prepare organic monolayers on hydride-terminated Ge(100) surfaces utilizing the available Ge–H bonds as chemical handles. The new hydride-terminated Ge(100) surface was prepared by utilizing an efficient preparation method involving soaking in an aqueous 10% HF solution. Lewis acid mediated hydrogermylation of alkynes and alkenes on the hydride-terminated Ge(100) surfaces results in alkenyl and alkyl surfaces, respectively, bound through Ge–C bonds. Thermal treatment of hydride terminated Ge surface with neat alkenes and alkynes, or solutions in mesitylene, also results in similar organic monolayers. Finally, these two approaches were contrasted with UV photoinduced hydrogermylation of alkenes. The resulting organic monolayers were characterized by infra-red spectroscopy (ATR-FTIR), stability studies, and contact angle measurements.
Degree
Ph.D.
Advisors
Buriak, Purdue University.
Subject Area
Chemistry|Materials science
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