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1996 (1)
1Author    IgorA. KyuntselRequires cookie*
 Title    C1 NQR Study of Thermoactivated Motions of Nitro Groups in Picryl Chloride  
 Abstract    The temperature dependences of the 35 C1 NQR frequency (v), spin-lattice relaxation time (T^), and spin-spin relaxation time (T 2) have been studied in 2,4,6-trinitrochlorobenzene (picryl chloride) from 77 K up to the melting point (354 K). The 7\ (T) curve exhibits a pronounced composite mimimum near 300 K which gives evidence for the reorientations of the two ort ho-N0 2 groups around their two-fold symmetry axes with the activation energies of 27.4 kJ mol 1 and 31.2 kJ mol 1 . These values can be related to the ortho-N0 2 groups having the twist angles of 33° and 81°, respectively (the crystal structure of picryl chloride is known). The T 2 (T) dependence exhibits interesting features, too: a deep minimum about 140 K and a new rapid decrease above 270 K. 
  Reference    Z. Naturforsch. 51a, 713—715 (1996); received October 10 1995 
  Published    1996 
  Keywords    NQR, reorientation motion, nitro group 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0713.pdf 
 Identifier    ZNA-1996-51a-0713 
 Volume    51