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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of the structure of the flavin-binding sites of flavocytochrome P450 BM3 using surface enhanced resonance Raman scattering (1999)
    Springer
    European biophysics journal 28 (1999), S. 437-445 
    Details
    ISSN: 1432-1017
    Keywords: Key words Raman ; Surface enhanced resonance Raman scattering spectroscopy ; Flavins ; Flavocytochrome P450 BM3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Flavocytochrome P450 BM3, an FMN-deficient mutant (G570 D), the component reductase and an FAD-containing domain were studied using surface enhanced resonance Raman scattering (SERRS). They were compared to spectra obtained from the free flavins FAD and FMN. For the holoenzyme and reductase domain, FMN is displaced during SERRS analysis. However, studies with the G570 D mutant indicate that FAD is retained in its active site. Analysis of SERRS frequencies and intensities provides information on the nature of the flavin binding site and the planarity of the ring, and enables an interpretation of the hydrogen bonding environment around ring III of the isoalloxazine moiety. Hydrogen bonding is strong at N3–H, C2=O and C4=O, but weak at N5. Structural alteration of the FAD domain of P450 BM3 is caused by removal of the FMN-binding domain. Further, the hydrogen bond at N3–H is lost and that at C2=O is weakened and the isoalloxazine ring system in the FAD domain appears to adopt a more planar arrangement. Alterations in the environment of the FAD in its isolated domain are likely to relate to changes in the redox properties and suggest a close structural interplay of FAD with the FMN-binding domain in intact flavocytochrome P450 BM3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050226
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance Raman spectra of a Langmuir-Blodgett film of substituted copper phthalocyanine on n-type silicon (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 31-34 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance Raman excitation profiles for a substituted phthalocyanine dispersed as a polycrystalline powder in a silver disc were compared with those for a Langmuir-Blodgett (LB) multilayer of the same material on a silicon surface. There is a strong angular dependence of the efficiency of the scattering process. The LB profiles are strongly influenced by the electronic fields from the smooth semiconducting silicon surface, which gives rise to increased π-π* energy separation and comparatively efficient scattering from upper vibronic states.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250200107
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular recognition using surface-enhanced Raman scattering from citrate-reduced silver colloids in non-aqueous solvents (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 771-775 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Surface-enhanced Raman scattering (SERS) from citrate-coated colloidal particles suspended in organic solvents is used to study surface reactions in an organic phase. Stable colloids which gave good SERS were produced from ethanol and acetonitrile. SERS was easily discriminated from the bulk solvent Raman scattering. Compounds which are sparingly soluble in water including 2,2′-bipyridine and benzene-1,2,4,5-tetracarboxylic acid dianhydride produced good SERS in ethanol. In the latter case, no SERS was observed from an aqueous colloid. Therefore, some form of solvent-dependent molecular recognition may operate. The formation of a bipyridine complex with copper(II) at the surface in a solvent system in which the ligand and complex are both soluble was observed. The solvent altered surface reactions. In the ethanol colloid, in contrast to the result in aqueous colloid, pyridine does not replace citrate readily. This work demonstrates the potential for the expansion of the use of colloidal SERS into the field of surface reactions in contact with an organic phase and is related to metal liquid-like films.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250221208
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  • 4
    Electronic Resource
    Electronic Resource
    Resonance Raman excitation profile of cobalt phthalocyanine at room temperature and 10 K (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 595-600 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance excitation profiles have been obtained for cobalt phthalecyanine at both room temperature and 10 K using a compressed disc of silver and the phthalocyanine. Low-frequency vibrations are shown to be influenced mainly by displacements on the bonding nitrogen, but high-frequency vibrations show a more complex pattern with some evidence that the vibrations v3 and v28 depend on Cα displacements. By comparison with copper, there appears to be a greater degree of scattering from 0-0 and 0-1 transitions and there is a shift towards increase 0-0 scattering in the sharper low-temperature profiles. It is concluded that a distortion, dynamic at room temperature and static at low temperature, plays a key role in determining the relative scattering and this distortion is larger for copper phthalocyanine than for cobalt phthalocyanine.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250200908
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  • 5
    Electronic Resource
    Electronic Resource
    Surface-enhanced resonance Raman spectroscopy of sulphonated copper phthalocyanine at a silver electrode (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 375-380 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectrum of sulphonated copper phthalocyanine on a silver electrode surface is reported for four excitation wavelengths in the Q-band region at voltages between +0.6 and -0.6 V (vs SCE). SERS activity is observed and the bonding and orientation of the surface species are voltage dependent and are inferred from a vibrational analysis. Maximum scattering intensity is observed at -0.2 V (vs SCE) and is attributed to molecules bonded edge-on to the surface through SO3- groups.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250200606
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  • 6
    Electronic Resource
    Electronic Resource
    Surface enhanced resonance Raman scattering from cyanocobalamin and 5′-deoxyadenosylcobalamin (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 1075-1076 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Surface enhanced resonance Raman scattering (SERRS) from cobalamins is reported. To achieve efficient adsorption and strong SERRS, the molecule is adsorbed on a polysine-treated silver colloid surface. This provides an organic barrier between the cobalamin and the metal, preventing denaturation, and gives positively charged groups for efficient adsorption. The technique can be used for in situ studies of changes in the metal coordination sphere, as is illustrated by reduction on the surface using dithionite for both cyanocobalamin and 5′-deoxyadenosylcobalamin. The efficient energy transfer at the surface appears to prevent photodegradation, which is a problem with resonance, and the efficiency of SERRS allows measurements at low effective concentrations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250261210
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  • 7
    Electronic Resource
    Electronic Resource
    The use of compacted metal discs to measure Raman spectra (1985)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 16 (1985), S. 245-250 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Compacted discs prepared from a mixture of finely divided particles of a compound diluted in a large excess of metal powder facilitate the measurement of Raman spectra for some compounds which give poor scattering by conventional techniques. The method is most useful with coloured compounds. The advantages include simplicity, increased signal-to-noise ratio by factors of up to 1000 and decreased or altered fluorescence. The effect appears to be caused mainly by small crevices in the compacted metal surface which act as internal mirrors to produce many small multiple-reflection cells, but there is also evidence of an electronic interaction with the metal surface. Silver, aluminium and copper matrices were studied, silver being found to be the most advantageous, although aluminium under certain conditions may also be effective.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250160406
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal standard/metal disc method for the measurement of low-temperature resonance Raman spectra in the solid state (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 277-279 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Mounting a sodium nitrate crystal on the surface of a disc made by compacting silver powder and the material to be studied enables Raman spectra of compounds such as zinc and nickel phthalocyanine to be measured in such a way that relative peak inteasities in any one disc can be quantified using the nitrate as a standard. It is a good method for the measurement of low-temperature spectra of resonant compounds and for the measurement of temperature dependence.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180409
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  • 9
    Electronic Resource
    Electronic Resource
    The use of deposited sol to detect benzotriazole at a non-SERS-active copper surface (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 899-901 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250251108
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