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2001 (1)
1994 (1)
1Author    ValentinP. Feshin, PeterA. Nikitin, IsmailA. AlievRequires cookie*
 Title    79'81Br NQR Spectra of Alkyl(4-Bromophenyl)Sulphides  
 Abstract    The 79,81Br NQR spectra of compounds of the series 4-BrC6H 4SR with R = (C H 2)"H (n = 1,2, 4 -9), (CH 2)I)C H (C H 3)2 (n = 0 -2) and C H m(C H 3)3_m were obtained at 77 K. The halogen atom electron densities in these compounds and chlorine-containing analogs are compared. The ratio of the amplitudes of the N Q R frequency oscillations in chlorine-and brom ine-containing compounds with R = (CH2)nH corresponds to the ratio of the polarizabilities of 35C1 and 79Br. The variation of the alkyl groups R influences the electron distribution of the halogen atom. 
  Reference    Z. Naturforsch. 49a, 639—641 (1994); received November 4 1993 
  Published    1994 
  Keywords    NQR spectra, Frequency, Alkyl(4-bromophenyl)sulphides, Oscillation effect 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0639.pdf 
 Identifier    ZNA-1994-49a-0639 
 Volume    49 
2Author    K. S. Suresh3, K. P. Rameshb, C. Raghavendra Rao3, J. RamakrishnabRequires cookie*
 Title    Pressure Dependence of the Chlorine NQR in Three Solid Chloro Anisoles  
 Abstract    The 35C1 Nuclear Quadrupole Resonance (NQR) frequency (V q) and spin lattice relaxation time (T{) in the three anisoles 2,3,4-trichloroanisole, 2,3,6-trichloroanisole and 3,5-dichloroanisole have been measured as a function of pressure upto 5.1 kbar at 300 K, and the data have been analysed to estimate the temperature coefficients of the NQR frequency at constant volume. All the three com­ pounds show a non linear variation of the NQR frequency with pressure, the rate of which is positive and decreases with increasing pressure. In case of 3,5-dichloroanisole the value becomes negative in the higher range of pressure studied. The spin lattice relaxation time T{ in all the three compounds shows a weak dependence on pressure, indicating that the relaxation is mainly due to the torsional motions. 
  Reference    Z. Naturforsch. 56a, 764—772 (2001); received July 19 2001 
  Published    2001 
  Keywords    NQR, 35C1, Frequency, Spin-lattice Relaxation Time, Torsional Motion, Pressure and Temperature Dependence, 3,5-dichloroanisole, 2,3,4-trichloroanisole, 2,3,6-trichloroan­ isole 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0764.pdf 
 Identifier    ZNA-2001-56a-0764 
 Volume    56