摘要:

AbstractThe laser Raman spectra of the solid hematoporphyrin free‐base H2Hem, the diacid, [H4Hem]2+and the platinum complexes, [H4Hem]2+[PtCI4]2−, the Sitting‐Atop complex (SAT),cis‐Pt(H2Hem) Cl2and the platino‐hematoporphyrin PtHem have been studied in the range 500 to 1800 cm−1. The spectra of the platinum complexes are significantly different from those of hematoporphyrin and changes of the band profiles upon incorporation of the platinum atom into the porphyrin plane are shown. An interesting change is observed in the series H2Hem →cis‐Pt(H2Hem) Cl2→ PtHem in the region 1300–1650 cm−1. The Raman lines in this region are normally assigned to the vibrational modes of CC and CN. The Raman spectra provide another evidence of the exi

ISSN:0377-0486    

DOI:10.1002/jrs.1250040102

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractTen out of eleven Raman active modes were detected in [Ni(NH3)6] X2powders, apart from internal modes of the X−ions. The Raman active lattice mode happens to agree fairly well with the predictions of a model based on the electrostatic potential field of point charges. The X = Cl compound showed evidence of losing ammonia during irradiation with the laser beam. Two modes (the NNiN angle deformation and the lattice vibration) are especially sensitive to the NH3−vacancies thus

ISSN:0377-0486    

DOI:10.1002/jrs.1250040103

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThe polarized Raman spectrum of a dilute solid solution single crystal of Ba2+CrO 42−doped in KI has been obtained. The polarization data confirm the previous assignments based on infrared absorption investigations alone. The Raman polarization measurements strongly indicate the presence of non‐randomly oriented Ba2+CrO 42−ion pairs possessing mainlyC2ν andCss

ISSN:0377-0486    

DOI:10.1002/jrs.1250040104

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThe Raman spectra of solid glyoxal‐d1and glyoxal‐d2have been recorded at −190°C from 100 to 3000 cm−1. Fundamental frequencies of glyoxal‐d2were observed at 2169, 1709, 1131, 944, 908 and 543 cm−1and assigned as the CD stretching, CO stretching, CD rocking, CC stretching, CD wagging and CCO bending modes respectively. The infrared spectra of the solids have been recorded from 90 to 4000 cm−1. For C2D2O2this gives the other six fundamentals at 2177, 1685, 1022, 643, 343 and 174 cm−1. The rule of mutual exclusion holds rigorously showing that the molecule has a centrosymmetric structure in the crystal and that the site isCi(1). The Raman and infrared spectra of glyoxal‐d1show many coincidences, confirming the breakdown of the rule of mutual exclusion when the center of symmetry is lost on partial deuteration. Fundamentals are assigned at 2882, 2161, 1720, 1699, 1352, 1116, 1005, 981, 710, 548, 357 and 193 cm−1. The frequency shifts

ISSN:0377-0486    

DOI:10.1002/jrs.1250040105

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractExperiment on Raman scattering in KH2AsO4and KD2AsO4single crystals in the temperature range of 50–300 K has shown an anomalous isotope effect on the linewidths of a fewA1modes in the 200–900 cm−1region. The widths in the deuterated crystal are narrowed by a factor of two to four depending on the line and temperature. The behaviour of the proton relaxation time has been obtained as a function of temperature and found to be very similar to those obtained by Lowendes et. al. from the spectral feature of the soft mode. A drastic decrease in the linewidths by a factor of three occurs at the ferroelectric phase trans

ISSN:0377-0486    

DOI:10.1002/jrs.1250040106

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThe assignment of the Raman frequencies from 200 to 1800 cm−1has been made taking into account the values calculated by Brandmülleret al.for a planar molecule since only the H atoms of NH2are out of the plane. In the crystal theV NO2sline is unusually weak and the 1276–1284 cm−1broad band is extremely strong: its complexity is explained by a Fermi resonance whose development can be followed with temperature variations. On the other hand the line of the deuterated pNA is always sharp because the resonant combination is related to a NH2vibration. The observation of this Fermi resonance confirms the non‐planar structure of the molecule in t

ISSN:0377-0486    

DOI:10.1002/jrs.1250040107

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThe complete single crystal Raman spectra of K3Mn(CN)6and the Raman spectrum of an aqueous solution of this compound were recorded at room temperature. The number of lines with low wave numbers makes it possible to exclude a crystal structure composed solely of unit cells with the monoclinic space groupC 2h5. All spectral data are in agreement with space groupD 2h14. AnOD‐structure can not be ruled out, but no positive evidence has been found for it. In the solution Raman spectrum all Raman active vibrations of the free ion are obs

ISSN:0377-0486    

DOI:10.1002/jrs.1250040108

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractLattice vibration frequencies of the low‐temperature modification (below 391 K) of 1,8‐dinitronaphthalene have been observed. The temperature dependence of the frequencies is discussed in relation to the phase transition mechan

ISSN:0377-0486    

DOI:10.1002/jrs.1250040109

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractThe Raman spectra ofN‐methylacetamide,N‐ethylacetamide, andN‐methylpropionamide have been recoraed using the laser lines at 6471 Å, 4765 Å, 4762 Å, 3507 Å. and 2573 Å for excitation. Appreciable intensity enhancement has been observed for the amide I and III lines in the UV excited spectra; the amide II lines show up clearly in the spectra using 2573 Å excitation, and theG‐methyl andN‐methyl symmetric deformation lines are also enhanced. The possible usefulness of the Raman spectra of peptide molecules obtained using ultraviolet excitati

ISSN:0377-0486    

DOI:10.1002/jrs.1250040110

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY

摘要:

AbstractHigh intensity resonance Raman overtone progressions out to ν = 3, 14, 23, 24, 25, 17, and 3 have been observed with 457.9 nm, 476.5 nm, 488.0 nm, 514.5 nm, 530.9 nm, 568.2 nm, and 647.1 nm excitation respectively, for monomeric iodine isolated in an argon matrix. The normalised intensities have been determined and plotted as excitation profiles for the overtones. There is substantial evidence indicating a resonance coupling not only with the3∏Ou+electronic state of I2, but also with the1∏1ustate. The following spectroscopic constants for matrix‐isolated iodine have been calculated from the wavenumber data: ωe= (213.70±0.22) cm−1, ωeXe= (0.60±0.01) cm−1, and ωeYe= (−

ISSN:0377-0486    

DOI:10.1002/jrs.1250040111

出版商:John Wiley&Sons, Ltd.    

年代:1975

数据来源: WILEY