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  • 1
    Electronic Resource
    Electronic Resource
    Temperature-Dependent Axial Ligation Changes and Photoreduction of Iron-Protoporphyrin-IX Dimethyl Ester Chloride at Low Temperatures Monitored by Resonance Raman Technique (1995)
    s.l. : American Chemical Society
    Inorganic chemistry 34 (1995), S. 346-349 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00105a053
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance Raman studies of hydrogenase-catalyzed reduction of cytochrome c3 by hydrogenation. Evidence for heme-heme interactions (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 6617-6623 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00228a004
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  • 3
    Electronic Resource
    Electronic Resource
    Reply to "Nuclear spin relaxation in NH4ClO4 and ND4ClO4'' (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1205-1205 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 180 K phase transformation in NH4ClO4 could not be detected by measurements of spin–lattice relaxation times for chlorine and deuterium isotopes by Bastow et al. due to much slower time scale of this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455236
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature-dependent Raman study of ammonium perchlorate single crystals: The orientational dynamics of the NH+4 ions and phase transitions (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 7018-7027 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A detailed temperature-dependent study of the Raman spectra of oriented single crystals of NH4ClO4 is reported in the spectral regions of lattice modes and internal vibrations of the ClO−4 and NH+4 ions between 10 and 300 K. The internal modes of the ClO−4 ions show splitting into several components due to site and correlation field effects. The linewidth, frequency shift, and intensities of some of the internal modes of the ClO−4 and NH+4 ions and the frequency shift of a few lattice modes show anomalous temperature dependence around 180 and at 40 K. These anomalies have been explained in terms of phase transformations associated with the changes in hydrogen bonding strength and reorientational freedom of the NH+4 ions in the lattice. The low temperature transition at 40 K exhibits a sharp and discontinuous anomaly in some of the spectral parameters measured in this study which is associated with order–disorder-type transition. The measured linewidth of the ν'1 mode in the diagonal scattering configuration can be understood in terms of vibrational dephasing of the ν1 excited state due to vibrational–librational coupling. The estimated activation energies in the 50–160 K and 10–40 K temperature ranges are found to be 141 and 51 cm−1, respectively, which correspond to the observed NH+4 librational frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450624
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental investigations on poly(ethylene oxide) based sodium ion conducting composite polymer electrolytes dispersed with SnO2 (2000)
    Springer
    Ionics 6 (2000), S. 248-259 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New Na+ ion conducting composite polymer electrolytes comprising of polyethylene oxide (PEO)-NaClO4 and PEO-NaI complexes dispersed with SnO2 are reported. The results of the studies based on optical microscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infra-red (FTIR) spectroscopy, impedance analysis and mechanical testing are presented and discussed. The electrical conductivity of ≈5·10−5 S·cm−1 at 40 °C was achieved for the dispersion of ≈10 wt.% of SnO2 in both systems. The composition dependence of the conductivity has been well correlated with the variation in glass transition temperature and degree of crystallinity. A substantial enhancement in the mechanical properties of the composite films was observed at the cost of slight decrease in the conductivity at higher concentration of SnO2. The temperature dependence of the conductivity follows apparently the Arrhenius type thermally activated process below and above the melting temperature of PEO. The conductivity of the materials has been found to be strongly humidity dependent. The materials are shown to be ionic with tion〉0.9. The electrochemical stability of the materials has been observed to be up to ≈3.2 V for (PEO)25NaClO4+x% SnO2 and is limited to ≈1.9 V for (PEO)25NaI+x% SnO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374074
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  • 6
    Electronic Resource
    Electronic Resource
    Raman spectroscopic study of phase transformation in single crystals of cadmium fluorosilicate hexahydrate (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 367-374 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A detailed temperature-dependent Raman study of oriented single crystals of CdSiF6 · 6H2O down to 10 K was made in the region of internal vibrations and lattice modes. The frequency shifts, Iinewidths and intensities of some of the modes associated with the [Cd(OH2)6]2+ and (SiF6)2- ions show abrupt changes at temperatures around 220 K and some doubly degenerate modes split into two components. These studies suggest that the system undergoes a structural phase transition at ca. 220 K.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250200605
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  • 7
    Electronic Resource
    Electronic Resource
    Optical phonons in α-NiSO4·6H2O single crystal (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 327-339 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Laser excited Raman spectra of a single crystal of α-NiSO4·6H2O have been attributed to the phonons originating only from the Raman active modes of isolated H2O (C2v), SO42- (Td) and Ni(H2O)62+ (Oh) units. It has been shown that Th symmetry considered earlier for NI(H2O)62+ complex by Jager and Schaack is not consistent with the crystal structure of α-NiSO4·6H2O and results in an erroneous symmetry classification of 288 phonon branches of the unit cell. A correct classification of these branches is reported. It is inferred that the SO42- and Ni(H2O)62+ polyhedra do not show large distortions from their respective Td and Oh symmetries at room temperature.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020402
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  • 8
    Electronic Resource
    Electronic Resource
    Rotational isomers of ethyl dithioacetate and ethyl thionoacetate: A Raman studyNRCC Publication No. 19494. (1981)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 11 (1981), S. 390-392 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of ethyl dithioacetate (CH3CS2C2H5) and ethyl thionoacetate (CH3C(=S)OC2H5) have been measured as a function of temperature in the liquid phase and in the solid phase at low temperature. For both compounds disappearance of several bands from the liquid spectrum on solidification established the presence of more than one conformer in the liquid phase. Temperature variation studies on band pairs whose components belong to different isomers gave enthalpy differences of 598±48 cal mol-1 and 1072±65 cal mol-1 between the conformers of CH3CS2C2H5 and CH3C(=S)OC2H5 respectively. The most probable low-energy conformer, in both instances, is the s-cis form with all the heavy atoms contained in a single plane.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250110518
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  • 9
    Electronic Resource
    Electronic Resource
    Resonance Raman spectra of protohemin and protohemin-imidazole complexNational Research Council of Canada Contribution No. 13915. (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 163-173 
    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 spectra of aqueous solutions of protohemin and its complex with imidazole have been obtained using several exciting lines from Ar+ and HeCd lasers. The effects of different axial ligands to iron in hemin are reflected in the resonance Raman spectra of their respective complexes. Within experimental limits, hemin does not show any anomalously polarized bands (Q1 〉 ¾) while its complex with imidazole shows several such bands when excitation is in the α and β absorption regions. When excitation is in the Soret region, a polarized band ∼ 1500 cm-1 appears in the spectra of hemin-imidazole complex and heme proteins. It is proposed as a spin state marker as well as to characterize the position of the iron ion relative to the porphyrin plane.Excitation profiles for some of the bands of hemin confirm the assigment of the α band near 5300 Å in the unresolved visible absorption spectrum.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020207
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  • 10
    Electronic Resource
    Electronic Resource
    Infrared and Raman spectroscopic studies of KHSO4 crystals (1982)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 13 (1982), S. 209-212 
    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 spectra of KHSO4 single crystals in different geometries have been investigated in the 10-4000 cm-1 range at 300 K, 150 K and 120 K. The infrared spectra of polycrystalline KHSO4 have also been measured. An interpretation of these results consistent with the crystal structure and other information on this system is presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250130303
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