摘要:

Harmonic force fields (in-plane) for gallium and indium trihalides are developed from complete or incomplete experimental assignments of vibrational frequencies. The missing frequencies are predicted from the calculations Mean amplitudes of vibration are calculated.

ISSN:0038-7010    

DOI:10.1080/00387017508067308

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The near ultra-violet absorption spectrum of parafluoro phenetole has been studied in vapour phase. About 135 red degraded Bands have been measured. These have been explained in terms of five ground state (187, 258, 346, 633 and 855 cm1) and seven excited state (151, 306, 527, 816, 966, 1279 and 1328 cm−1) fundamental frequencies. A red shift of 1243 cm−1of (0,0) hand relative to that of Phenetole is also observed.

ISSN:0038-7010    

DOI:10.1080/00387017508067309

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A harmonic force field is developed and an assignment of the vibrational frequencies for Ga2Cl6is proposed. The mean amplitudes of vibration are calculated.

ISSN:0038-7010    

DOI:10.1080/00387017508067310

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

In a recent communication, Keszthelyi1claims that our application2of the well-known equation used to describe the relative yield of excimer and mono-mer emission in spectroscopic studies3,4

ISSN:0038-7010    

DOI:10.1080/00387017508067311

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The bands of the B-X system of BiI have been photographed in the second order of a 35 ft concave grating spectrograph (with a dispersion of 0.33 Åing;/mm and resolution 2 × 180,000). A precise vibrational analysis of this system has been carried out and the vibrational constants WeYe and WeZe for the upper and lower states have been evaluated for the first time.

ISSN:0038-7010    

DOI:10.1080/00387017508067312

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

In the present paper we describe the35Cl NQR investigation of PCl3-reorientations in the molecules of three trichlorophosphazocompounds, Cl3P=NCC1(CC13)2(I), C13P=NP(O)(CC13)2(II), C13P=NCOCF3(III). In order to elucidate the quantitative parameters of the reorientational motion we have used (unlikeI) the temperature dependence of the quadrupole spin-lattice relaxation time T1which is very sensitive to a molecular dynamics2,3.

ISSN:0038-7010    

DOI:10.1080/00387017508067313

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Resonance Raman spectra of Mesoporphyrin IX dimethylester in solution were obtained using various wavelengths in the region of electronic band IV. Vibrational data, as well as variations in the depolarization ratios and the band intensities with excitation wavelengths were compared to those previously obtained for porphin. The new data provide confirmation of the existence of three, most probably purely electronic transitions in band IV of both Mesoporphyrin IX dimethylester and porphin.

ISSN:0038-7010    

DOI:10.1080/00387017508067314

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The 220 MHz1H nmr spectra of the title compounds (1a) and (2a), respectively, at low temperature in CDCl3solution are interpreted in terms of two interconverting chair forms with unequal populations (Ke= 1.17, δG° ∼70 cals/mole for1aand Ke= 1.8, δG° ∼0.2 kcal/mole for2aat −30°C). A strong intramolecular OH…S hydrogen bond in both compounds reduces the number of degrees of freedom of the bulky N-thiobenzoyl substituent, which nearly eclipses the equatorial α-CH2hydrogen atoms in both comformations. Steric interactions between the 6′ phenyl proton and the hetero-ring α-CH2protonstransto the thiocarbonyl group are different in the two conformations oflaand2a.

ISSN:0038-7010    

DOI:10.1080/00387017508067315

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Recently, Braunstein and Clark1described the synthesis and vibrational spectra of complexes containing the AuCl2, AuBr2and AuI2ions. In order to obtain a deeper insight into the vibrational properties of these anions it seems interesting to calculate, using the available spectroscopic data, values for the mean amplitudes of vibration and some related quantities.

ISSN:0038-7010    

DOI:10.1080/00387017508067316

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

According to the donor-acceptor model of hydrogen bonding, the intermolecular bonds R-AH…BR1and R-A−…H+BR1are, in the main, of the same nature1. In this case, the charge transfer at acid-base interaction

ISSN:0038-7010    

DOI:10.1080/00387017508067317

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor