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1994[X]
1Author    Toshiyuki Takam, KeisukeN. Akam Ura, M. Ikito Ihara, Hisanobu Wakita, Toshio YamaguchiRequires cookie*
 Title    Raman Scattering and X-ray Diffraction Studies on Zinc(II) Bromide Solutions in Methanol and N,N-Dimethylformamide in the Temperature Range 77-333 K  
 Abstract    n Z i n c (I I) B r o m i d e S o l u t i o n s i n M e t h a n o l a n d N , N -D i m e t h y l f o r m a m i d e i n t h e T e m p e r a t u r e R a n g e 7 7 -3 3 3 K The structure o f zinc(II) brom o com plexes in m ethanol and N,N-dim ethylformam ide (D M F) (molar ratio [solvent]/[ZnBr?] = 10, temperature range 7 7 -3 3 3 K) has been investigated by Raman scattering and X-ray diffraction. In the m ethanol solution symmetric Z n -B r vibrations (vt) o f the dibrom o-and tribrom ozinc(II) com plexes were observed at 209 and 184 c m " 1, respectively. With decreasing temperature the intensity o f the vx band decreased for the dibrom o and increased for the tribromo complex. In addition, the Vj band for the tetrabromo complex appeared in the supercooled and glassy methanol solutions. In the D M F solution only one band, assigned to both the dibrom o-and tribromozinc(II) com plexes, was observed. Its intensity did not change with temper­ ature. The X-ray diffraction data revealed that the average number of Z n -B r interactions within the zinc (II) bromo com plexes does not change with temperature while the number of nonbonding Br • • • Br interactions within the com plexes increases from 1.5 at 298 K to 1.9 at 243 K for the methanol solution and from 1.3 at 298 K to 1.8 at 243 K for the D M F solution. These Raman and X-ray results have confirmed that in both m ethanol and D M F solutions at high temperatures the dibrom o species is predominantly formed, whereas at low temperatures the tribromo com plex is favored, the tetrabromo species being formed only in the supercooled and glassy m ethanol solutions. The temperature dependent equilibrium shifts of the zinc(II) bromo complexes in the methanol and D M F solutions are discussed together with previously reported results for the aqueous phase. 
  Reference    Z. Naturforsch. 49a, 1119 (1994); received O ctober 15 1994 
  Published    1994 
  Keywords    Raman spectroscopy, X-ray diffraction, Zinc(II) bromide, M ethanol, N, N -D im ethyl-formamide 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1119.pdf 
 Identifier    ZNA-1994-49a-1119 
 Volume    49