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1992 (1)
1Author    Li Pang, E.A C Lucken, P. TissotRequires cookie*
 Title    An NQR and Calorimetric Study of a Phase Transition in tetrakis (a-Phenylethylamine)-bis (isothiocyanato) nickel (II) / örf/ftf-Dichlorobenzene Clathrate  
 Abstract    The 35 C1 NQR spectrum of ortho-dichlorobenzene as a guest molecule in tetrakis(x-phQny\ethy\-amine)-6i's(isothiocyanato)nickel(II), has been studied in the temperature range of 77 K to 250 K. At 77 K the clathrate has two resonances of equal intensity at 35.840 and 36.080 MHz, to be compared with those of pure orr/io-dichlorobenzene, where there are three lines at 35.580, 35.775 and 35.824 MHz. At 230 K there occurs an irreversible phase change which results in the expulsion of the ortho-dichlorobenzene from the host crystal, and the NQR signals thereafter correspond to the three lines of the unclathrated guest molecule. These events were also followed and confirmed by a calorimetric study in the range 210-300 K. The phase change is thought to be due to a transformation of the host molecule, where the thiocyanato groups are in the trans configuration in the clathrate, to the eis configuration, which is known not to form a clathrate. 
  Reference    Z. Naturforsch. 47a, 251—253 (1992); received July 27 1991 
  Published    1992 
  Keywords    Order-disorder effects, Phase transition Potential energy, Host-guest interaction 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0251.pdf 
 Identifier    ZNA-1992-47a-0251 
 Volume    47