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  • 1
    Electronic Resource
    Electronic Resource
    Raman resonance excitation profile of the μ-oxobis[pentacyanomanganate (III)] ion (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 577-579 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The resonance Raman spectra of potassium μ-oxobis[pentacyanomanganate(III)] cyanide, K7[Mn2O(CN)10]CN, were measured using exciting lines at 356.4, 406.7, 530.9, 568.2, 603.5, 647.1 and 676.4 nm. By combining these data with those obtained previously (excitations at 457.9, 476.5, 488.0, 496.5, 514.5 and 608.6 nm), the excitation profiles were plotted for three totally symmetric vibrations at 1880 (CNax strech), 527 (MnCax stretch) and 259 cm-1 (MnOMn stretch). It was found that the equation derived by Mingardi et al. can adequately express these excitation profiles and that the previous assignment of the electronic transition at 509 nm needs revision.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180808
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance Raman spectra of dioxygen adducts of manganese(II) porphyrins in dioxygen matrices (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 315-319 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The resonance Raman spectra of side-on type dioxygen adducts of Mn(TMP), Mn(TPP) and Mn(OEP), where TMP, TPP and OEP denote the dianions of tetramesityl-, tetraphenyl- and octaethyl-porphines, respectively, were measured in O2-Ar(1 : 30) matrices at ca. 15 K. The bands near 990, 710 and 430 cm-1 were assigned to ν(O2), νs(Mn—O) and νa(Mn—O), respectively, based on 16O2/18O2 isotopic shifts and normal coordinate calculations on an isosceles MnO2 moiety. Vibrational coupling between the νs (Mn—O) and porphyrin modes obscured the location of the former mode in the spectra of Mn(TPP)O2 and Mn(OEP)O2. The bands near 825 cm-1 which appear in all three porphyrins are shifted 34-36 cm-1 on 16O2/18O2 substitution. Evidence is presented to show that this band is due to the ν(Mn=O) of oxomanganese(IV) porphyrin, which was produced by photo-cleavage of the O—O bond of the dioxygen adduct. These ν(Mn=O) are ca. 70 cm-1 higher than those observed in acetonitrile solution. This has been attributed to the difference in the spin state; the oxomanganese(IV) porphyrins in acetonitrile solution are of high spin whereas those produced in O2-Ar matrices are of low spin.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250220603
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  • 3
    Electronic Resource
    Electronic Resource
    Resonance Raman spectra of the O2 adducts of cobalt ‘picket-fence’ porphyrin complexes of 3, 5-dichloropyridine (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 27-30 
    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 are reported for the 16O2 and 18O2 adducts of cobalt porphyrin complexes with 3,5-dichloropyridine (DCP) for three different ‘picket-fence’ porphyrins. It is shown that the v(O - O) effectively couples with an internal mode of DCP giving rise to complicated spectral patterns. These spectral patterns were carefully analyzed to reveal the inherent wavenumbers of v(O - O) which are shown to vary as expected, given the known relative hydrogen bonding capabilities of the three different superstructured porphyrins.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260106
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative study of aclacinomycin versus adriamycin by means of resonance Raman spectroscopy (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 133-141 
    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 adriamycin and aclacinomycin A were examined in their H2O and D2O solutions. These spectra appear totally different from each other, but the differences are found to be similar to those between 1,4- and 1,8-dihydroxyanthraquinone, which are considered to be model chromophores of adriamycin and aclacinomycin, respectively. Surface-enhanced resonance Raman spectra of these two drugs were also compared by the use of silver sols. The effects of DNA binding on the resonance Raman spectra are also significantly different for these two drugs. Adriamycin was found to be intercalated in the CpG (or GpC) site of the DNA duplex, but aclacinomycin in the TpA (or ApT) site. Most of the differences in the spectra and sequence specificity are explained in terms of the molecular structures of their chromophores, i.e. in the adriamycin chromophore (1,4-dihydroxyanthraquinone) two OH groups are hydrogen bonded to different C=O groups, whereas in the aclacinomycin chromophore (1,8-dihydroxyanthraquinone) two OH groups form hydrogen bonds with the same C=O group, leaving the other C=O group free from any intramolecular hydrogen bonding.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210211
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular distortion of distamycin on binding to DNA as revealed by Raman spectroscopy (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 321-326 
    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 distamycin and its complex with DNA were examined in both H2O and D2O solutions. To facilitate band assignments, Raman spectra of several small model compounds of distamycin were also obtained. On binding to DNA, the C=O stretching band at 1620 cm-1 (amide I band) of distamycin was shifted upwards by 14 cm-1, whereas a strong pyrrole-ring stretching band at 1437 cm-1 was shifted downwards by 7 cm-1 in H2O. In addition, most of the Raman bands including amide I, II and III became narrower and sharper on binding to DNA. These results indicate that, in the free state, the dihedral angles around the C—C and N—C bonds connecting the pyrrole ring and the peptide chain of distamycin fluctuate near 0° (coplanar configruation), whereas in the bound state these angles are fixed and markedly shifted from 0°. Previous x-ray and NMR studies on distamycin (netropsin)-DNA complexes show that such deviations occur when these drug molecules are bound in the minor groove of DNA. Molecular distortion of distamycin caused by interaction with other polynucleotides has also been elucidated by using such spectral characteristics as diagnosis.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210508
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  • 6
    Electronic Resource
    Electronic Resource
    Raman spectra of matrix-isolated and solid chromiumhexacarbonyl (1978)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 7 (1978), S. 341-345 
    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 Cr(CO)6 have been measured in an Argon matrix at 13 K and in the solid state at 292 and 13 K. As expected only the A1g, Eg and F2g modes were observed in the matrix spectra. The ν4(Eg) mode was observed split into a polarized and a depolarized component. This indicated a lowering of the symmetry from Oh to D4h or one of its subgroups. Depolarization ratios obtained in the matrix were close to values obtainable in liquids. In the low temperature solid state spectra all thirteen fundamental modes as well as several overtones and combination bands were observed. The six modes ν5(F1g) (inactive), ν6(F1u), ν7(F1u), ν8(F1u), ν12(F2u) (inactive) and ν13(F2u) (inactive), which were previously inferred from overtones and combinations, were observed for the first time.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250070611
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