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Sökning: WFRF:(Figgemeier Egbert)

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1.
  • Aranyos, Viviane, et al. (författare)
  • Electropolymerisable bipyridine ruthenium(II) complexes: synthesis, spectroscopic and electrochemical characterisation of 4-((2-thienyl)ethenyl)-and 4,4'-di((2-thienyl) ethenyl)-2,2'-bipyridine ruthenium complexes
  • 2004
  • Ingår i: Polyhedron. ; 23, s. 589-598
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Four new ruthenium polypyridyl complexes with mono- or di-((2-thienyl) ethenyl) substituted bipyridines have been synthesized. The complexes were characterized by NMR, elemental analysis, UV-Vis absorption and electrochemistry (differentioal pulse and cyclic voltammetry). Electroactive polymer films of these complexes have been prepared by oxidative electropolymerisation and characterized by UV-Vis absorption spectroscopy and electrochemistry. The electrochemically induced polymerisation of the complexes resulted in a significant shift of the oxidation potential of the Ru(II)-Ru(III) process towards more positive potentials. Also, MLCT absorption band of the polymeric complexes is shifted towards shorter wavelengths. These results are interpreted in terms of an interrupiton of the conjugated system of the (2-thienyl)ethenyl-substituted bipyridine ligands due to a radical polymerisation mechanism affecting rather the ethenyl part of the ligand than the thienyl.</p>
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  • Eriksson, Mathilda, et al. (författare)
  • Utilization of a right-handed coiled-coil protein from archaebacterium Staphylothermus marinus as a carrier for cisplatin
  • 2009
  • Ingår i: Anticancer Research. - 0250-7005 .- 1791-7530. ; 29:1, s. 11-18
  • Tidskriftsartikel (refereegranskat)abstract
    • <p><strong>BACKGROUND:</strong></p> <p>The nano-sized right-handed coiled-coil (RHCC) protein, originating from the archaebacterium Staphylothermus marinus, is stable at high salt concentrations, high temperatures, high pressures and extremes of pH. Its crystal structure reveals four hydrophobic cavities which can incorporate heavy metals. Nano-sized compounds have been used to carry cytotoxic drugs to tumours, avoiding delivery to healthy tissue, in part due to enhanced permeability in tumour blood vessels (enhanced permeability and retention effect).</p> <p><strong>MATERIALS AND METHODS:</strong></p> <p>The ability of RHCC to carry the platinum-containing chemotherapeutic drug cisplatin to cells, while retaining the cytotoxic potential was tested both in vitro and in vivo.</p> <p><strong>RESULTS:</strong></p> <p>RHCC was able to bind and enter cells in vitro and was not severely toxic or immunogenic in mice. Moreover, RHCC incorporated cisplatin, without inhibiting the cytotoxic potential of the drug against tumour cell lines in vitro or in vivo.</p> <p><strong>CONCLUSION:</strong></p> <p>RHCC can be used as a carrier of cisplatin without abrogating the effect of the drug.</p>
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  • Figgemeier, Egbert, et al. (författare)
  • Modification of electron transfer properties in photoelectrochemical solar cells by substituting {Ru(terpy)(2)}(2+) dyes with thiophene
  • 2004
  • Ingår i: Inorganic Chemistry Communications. - 1387-7003 .- 1879-0259. ; 7:1, s. 117-121
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A comparison of the properties of the 2-thienyl-substituted carboxyphenyl {RuII(terpy)2} dyes with their non-substituted analogues has enabled us to gain insight into the electronic properties that are prerequisite for efficient electron injection into the TiO2 conduction band in photoelectrochemical solar cells. Introducing the thienyl group has a profound effect upon the efficiency of photoinduced electron injection. This effect can be explained by a significant shift in the LUMO position from the terpy ligand anchored on the TiO2 surface towards the 2-thienyl substituted ligand, which is shown by means of electrochemistry and semiempirical calculations.</p>
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  • Tsekouras, George, et al. (författare)
  • A bistable electrochromic material based on a hysteretic molecular switch immobilised on nanoparticulate metal oxide
  • 2008
  • Ingår i: Journal of Materials Chemistry. - 0959-9428 .- 1364-5501. ; 18:47, s. 5824-5829
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Combination of an electrochemically bistable Ru polypyridyl complex (2) with the metal oxide semiconductor Sb:SnO2 formed the basis of an electrochromic hybrid material characterised by a hysteretic response to applied potential. The electrochemical bistability of the molecular component arises from redox-triggered linkage isomerisation where an ambidentate ligand changes reversibly between N- and O-coordination in the Ru(II) and Ru(III) states, respectively. Reversible oxidation and reduction result in a pronounced electrochromic effect (change in UV-Vis absorption at the metal-to-ligand-charge- transfer (MLCT) band) and the potentials for interconversion between the states are separated by similar to 0.5 V due to the linkage isomerisation reactions. With a carboxylate anchoring group on the auxiliary ligand, the bistable molecular switch was immobilised on the surface of nanoparticulate Sb:SnO2 films. This resulted in an electrode material featuring a hysteretic electrochemical response where oxidation state and colour of the electrode depended on the electrochemical history of the system.</p>
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