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Department of Chemistry (Chemicum) research in society from basics to applications research-based education knowledge in service Welcome to the Department of Chemistry!
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Department Composition (education) Laboratory of Analytical Chemistry Inorganic Chemistry Organic Chemistry Physical Chemistry Polymer Chemistry Radiochemistry Centre for Chemistry Education Chemistry ICT Center (eChemicum) Laboratory for Instruction in Swedish VERIFIN
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Strategic Focuses in Research (2004-2006) Green chemistry Material and nanochemistry Computational and theoretical chemistry Science teacher education and its reseach
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Green Chemistry is the use of chemistry for pollution prevention. More specifically, green chemistry is the design of chemical products and processes that are more environmentally benign.
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. Micro- and optoelectronics Space applications Nuclear waste purification Biomaterials Pharmaceuticals MATERIALS CHEMISTRY Application areas MOSFET transistor Grid filter for X-ray detector
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. Templating by porous materials → nanowires, nanorods Templating by fibers → nanotubes Electrospinning → nanowires, nanotubes Patterning with SAMs Nanoparticles Smart polymers and materials MAKING OF NANOMATERIALS
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. Nanowires, nanorods coated by ALD Glancing angle evaporation Patterning with SAMs Star polymers Block copolymers MAKING OF NANOSTRUCTURES + oblique evaporation + electrodeposition + dissolution of alumina + ALD free standing porous alumina
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. Dielectrics for gate oxides in MOSFETs Dielectric films for DRAMs and FERAMs Metal films Nitride films for barriers THIN FILM MATERIALS FOR MICROELECTRONICS Al 2 O 3 film deposited by ALD from AlCl 3 and Al(O i Pr) 3. TiCl 4 + Zn + NH 3 TiN in collaboration with Intel In collaboration with NIST
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INORGANIC IX MATERIALS: ”ION SIEVES” FOR HIGHLY SELECTIVE RADIONUCLIDE SEPARATIONS EXAMPLES:
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Gold nanoparticles with hydrophilic and hydrophobic polymer grafts
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Development of miniaturized analytical devices Electrospray devices –PDMS –SU-8 Miniaturized atmospheric pressure chemical ionization (APCI) and photoionization sources (APPI)
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Development of miniaturized analytical devices Methods based on porous silicon –Desorption Ionization On Silicon (DIOS) –Filtration devices SU-8 microchannels for CE laser MS porous area sample Midazolam MW: 325
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Milestones in noble-gas chemistry First compounds predicted already in 1902! Pauling 1933: XeF 6 and KrF 6 should be preparable. Bartlett 1962: first noble-gas compound, Xe[PtF 6 ]. In matrices: First : KrF 2 (Turner and Pimentel, 1963). Others: XeCl 2 (Nelson and Pimentel, 1967); ClXeF (Bondybey, 1971). Strong interactions in matrices: Cr(CO) 5 ---Rg (Perutz and Turner, 1975); Rg---BeO (Thompson and Andrews, 1994). XeAuF (Cooke and Gerry, 2004). HRgY Pettersson et al., 1995-)
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photolyzedinitial sample HI/Xe, 1:1000 annealed to 45 K
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18 Noble gas hydrides ArKrXe HXeH HXeI HXeBr HKrClHXeCl HArFHKrF HKrCNHXeCN HXeNC HXeOH HXeO HXeSH HXeNCO HKrCCHHXeCCH HXeCCXeH HXeCC HKrC 4 HHXeC 4 H
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HXeI 1.68 Å 3.1 Å +0.129+0.347-0.476 MP2/43333/433111/41111(Xe, I)/6-311++G(3d,3p) (H) Van der Waals -distances: H Xe 3.8 Å4.3 Å I Experimental:
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(HNg) + + Y - H + Ng + Y Avoided crossing HNgY molecules correlate with neutral atomic asymptote H-Ng-Y
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Effect of isotopic substitution on the fundamentals of HArF
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132.9 196.9
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Predicted organo-Ng-molecules Numerous Xe-containing organic molecules are known, normally containing F. Examples : R 2 Xe, where R = C 6 F 5 or 2,4,6-C 6 H 2 F 3 [CF 3 C CXe][BF 4 ] So far, no organic Ar compounds known. Non-halogen containing organic molecules predicted in 2002: Lundell et al. J. Phys.Chem. A 106 (2002) 11950. HXeC 6 H 5 HXeCCH HXeOC 6 H 5 HXeCCXeH
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Predicted organo-Ng-molecules The MP2/LJ18/6- 311++G(2d,2p) calculated structure and Mulliken charges of HCOOXeH Works for larger acids, glycine, alanine and valine. J. Lundell et al., Computers&Chemistry, 24 (2000) 325-330. Xe H
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Acetylenic systems HNgC 6 H and HNgC 8 H- molecules expected to be more stable than HNgC 4 H and HNgC 2 H First halogen-free organic Xe compounds. First organic Kr compounds. Challenge: Organic Ar- compound! C 2 H2.956 C 4 H3.558 C 6 H3.809 C 8 H3.996 Electron affinity: Electron affinity of C 2n H radicals localized at the C end.
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Bond lengths (Kr) 1.582.261.241.371.221.06 (Xe) 1.742.331.241.371.221.06 (Xe) 1.752.321.231.06 (Kr) 1.602.251.231.06 MP2/LJ18(Xe)/6-311++G(2d,2p) level
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Recent computational predictions H-Xe-C C-H H-Xe-C C-Xe-H H-Xe-C C-Xe- C C-Xe-C C-Xe-...-H E. C. Brown, A. Cohen and B. Gerber, JCP, 122 (2005) 171101. F-Kr-C C-H F-Kr-SiF 3 S. Yockel, A. Garg, A. Wilson, CPL., 411(2005)91.
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Applications? Very high energy compounds, could form solids! Specific activation of functional groups: ”Xe-catalysis”. Function of Xe in aenesthesia Solving the ”missing Xe-problem”
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