Go toArchive
Browse byFacets
Bookbag ( 0 )
'35 C1 NQR study' in keywords
Results  1 Item
Sorted by   
Section
Publication Year
1997 (1)
1Author    A. R. Ofial, S.-Q Dou, V. G. Krishnan, H. Paulus, H. Fuess, Al WeissRequires cookie*
 Title    X-Ray and 35 C1 NQR Studies on the Trichloroacetyl Group in Covalent and Ionic Compounds of L-Valine and DL-Valine  
 Abstract    The crystal structures and 35 C1 NQR of trichloroacetyl-DL-valine (1), trichloroacetyl-L-valine (2), as well as the salts of trichloroacetic acid with DL-valine (3) and L-valine (4) have been investigated. Crystal data are for (1): Monoclinic, C2/c, a= 15.835(4) Ä, b= 10.481 (3) Ä, c = 14.046(4) A, /? = 103.28(1), Z = 8; (2): Orthorhombic, P2 1 2 1 2 1 , a = 12.117(3) Ä, 6=10.896(3) Ä, c= 8.718(2) Ä, Z = 4; (3): Triclinic, PI, a= 17.269(3) Ä, 6 = 8.504(3) Ä, c = 10.427(4) A, a = 105.38(2), £ = 96.98(2), y = 96.24(2), Z = 2; (4): Monoclinic, P2 1? a = 10.378(4) A, 6 = 20.349(8) A, c= 11.890(5) A, B = 95.28(2), Z = 8. The onset of rotational motion within the trichloroacetyl groups bleaches out 35 C1 NQR lines between 115 K and 185 K for (l)-(4). While TCA-L-valine (1), TCA-DL-valine (2), and TCA*) • DL-valine (+) (3) do not show any phase transition in the temperature range 77 K to 295 K, TCA <_) • L-valine (+) (4) shows more than one phase transition above 77 K before the three NQR signals bleach out at 164 K. 
  Reference    Z. Naturforsch. 52a, 249—258 (1997); received August 30 1996 
  Published    1997 
  Keywords    35 C1 NQR study, trichloroacetyl, valine, crystal and molecular structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0249.pdf 
 Identifier    ZNA-1997-52a-0249 
 Volume    52