Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"hexafluorobenzene"”.
-
A Nanosecond Laser Spectrophotometric and Product Investigation of the Chemistry of Fluorenylidene
… chemistry of fluorenylidene has been studied in hexafluorobenzene, cyclohexane, cyclopropane, spiropentane, acetonitrile, and Freon 113 spectroscopically, and chemically by isolation and characterization of products. Proposal of an equilibrium between singlet and triplet fluorenylidene has been …
-
Improved mass spectrometry characterization of organic compounds using analyte preconcentration and radio-frequency ionization.
… by high electron affinity molecules (e.g., hexafluorobenzene) in a 9.4 tesla FT-ICR mass spectrometer. Results from the electron attachment rate constant for hexafluorobenzene, using a post-RF electron trapping FT-ICR experiment, indicate that RFI process involves RF-generated electrons.
-
Effect of the fractionation and immobilization on the sorption properties of humanic acid
… 19F-NMR was used to study the sorptive uptake of hexafluorobenzene by the humic acid and its fractions. It was found that humic acid molecules have different chemical environments into which organic pollutant such as hexafluorobenzene can sorb. Small humic acid molecules have at least three …
-
Time-Resolved Studies of Aryl Carbenes
… acetonitrile, 2.0 (+OR-) 0.5 x 10('9) s('-1) in hexafluorobenzene, and > 7 (+OR-) 1 x 10('9) s('-1) in cyclohexane. An additional transient absorbing at 470 nm and 500 nm which is attributed to the 9-fluorenyl radical appears with a rate constant of 7.2 (+OR-) 1.9 x 10('8) s('-1) in cyclohexane …
-
Adhesion/Diffusion Barrier Layers for Copper Integration: Carbon-Silicon Polymer Films and Tantalum Substrates
… 800 K, with dewetting occurred only above 400 K. Hexafluorobenzene moieties can also be incorporated into the growing film with good thermal stability. Studies on the Ta substrates demonstrate that even sub-monolayer coverages of oxygen or carbide on polycrystalline Ta significantly degrade the …
-
Synthesis, Properties, and Reactivity of Pentafluorophenyl Substituted Cyclopentadienes and Their Transition Metal Complexes
… by the reaction of sodium cyclopentadienide and hexafluorobenzene (C6F6) under varying conditions. Corresponding C6F5-substituted cyclopentadienyl ligands (sodium salts) are obtained upon deprotonating the dienes with NaH. Complexes of Mn(I), Re(I), Fe(II), Co(II), Zr(IV) are synthesized by …
-
Morphological and Structure-Property Analyses of Poly(arylene ether sulfone)-Based Random and Multiblock Copolymers for Fuel Cells
… is not well-known. The choice of linkage type, hexafluorobenzene (HFB) vs. decafluorobiphenyl (DFBP), appears to have small but observable influences on multiblock copolymers with disulfonated and unsulfonated poly(arylene ether sulfone) oligomers. DFBP linkages promote greater phase separation …
-
Development of New Synthetic Approaches to Biologically-Active Peptides
… making use of disulfide crosslinking with hexafluorobenzene in biologically active p53 peptides. Residues of the biologically active pDI peptide that had been shown to be tolerant to substitution were replaced with cysteine (analogues), including D-cysteine, homocysteine and penicillamine. …
-
Electron Transfer and Other Reactions Using Atomic Metal Anions
The atomic metal anions Rb-, Cs-, Cu-, Ag- and Fe- have been generated in the gas phase and reacted with various neutral reactants in a triple quadrupole mass spectrometer. The metal anions were formed via electrospray ionization of the metal-oxalate solutions and form in gas phase between the …