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181Author    Hideta Ishihara, Shi-Qi Dou, Keizo Horiuchi, V. G. Krishnan, Helmut Paulus, Hartmut Fuess, Alarich WeissRequires cookie*
 Title    Isolated versus Condensed Anion Structure II; the Influence of the Cations (1,3-propanediammonium, 1,4-phenylendiammonium, and w-propylammonium) on Structures and Phase Transitions of CdBr^-Salts A 79,81 Br N Q R and x . ray structure Analysis  
 Abstract    The influence of the cations on the condensation of anions CdBr 4 2 ~ in salts (A')CdBr 4 (II) and (A) 2 CdBr 4 (II) is studied by 79,81 Br NQR and X-ray crystal structure determinations. (A')CdBr 4 : A' = [H 3 N(CH 2) 3 NH 3 J 2+ (1) crystallizes with a layer-type anion structure at 298 K and A' = [l,4-(H 3 N) 2 C 6 H 4 J-+ (2) crystallizes with a chain-type anion structure at 298 K. (A) 2 CdBr 4 : A = [n-H 3 C(CH 2) 2 NH 3 ] + (3) crystallizes with a layer-type anion structure at 293 K. (1) shows successive phase transitions at 328, 363, and 495 K according to the NQR and DSC measurements. Phase IV of (1): at 298 K orthorhombic, Pnma, Z = 4,a = 772.1 (4), b = 1905.4(9), c = 789.8(4) pm. 81 Br NQR spectrum showed a doublet at 77 K (phase IV) with v x = 61.177 and v 2 = 45.934 MHz and also a doublet at 350 K (phase III) with z/, = 57.581 and u 2 = 48.747 MHz. (2): at 295 K orthorhombic, Pnma, Z = 4, a = 802.5(3), b = 1775.1(6), c = 881.9(3) pm; the five-coordinated Cd atom and one-dimensional [CdBr 4 J~~ anion chain structure was observed. This coordination and chain structure are very rare for (A')CdX 4 (II) or (A)-,CdX 4 (II). Two 81 Br NQR lines were observed at 77 K: v x = 70.159 and z/ 3 = 40.056 MHz. One more line appeared at 85 K: v 2 = 53.622 MHz. A 81 Br NQR triplet was observed at 273 K: v x = 67.919, v 2 = 56.317, and u 3 = 40.907 MHz. (3) shows successive phase transitions at 121, 135, 165, and 208 K according to the NQR, DSC, and DTA measurements. Phase I of (3): at 293 K orthorhombic, Cmca, Z = 4, a = 783.4(4), b = 2480.2(10), c = 806.5(4) pm. 81 Br NQR doublet was observed at 77 K (phase V) and at 300 K (Phase I) with t/, = 61.060 and i/ 2 = 54.098 MHz (77 K); v x = 55.835 and u 2 = 55.964 MHz (373 K). No NQR line could be observed in phases II, III, and IV. 
  Reference    Z. Naturforsch. 51a, 1216—1228 (1996); received August 12 1996 
  Published    1996 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-1216.pdf 
 Identifier    ZNA-1996-51a-1216 
 Volume    51 
182Author    Alfred Klemm, Lutz SchäferRequires cookie*
 Title    Association in Molten Salts and Mobility Isotherms showing the Chemla Effect  
 Abstract    In 1984 a model for additive binary molten salt mixtures had been proposed that allowed for a qualitative understanding of the occurence of the Chemla effect (equal internal mobilities at a certain mixing ratio of the salts). In that model the presence of three ions (1,2 and 3) and two neutral molecules (4 and 5) consisting of two ions is assumed, and the ratios K\ = x* / x\x^ and A'2 = X5 / X2X3 of their mole fractions are assumed to be independent of the mixing ratio of the salts. In the present paper, that model is compared with recent experimental results on the system (Li, Cs)Cl obtained in Japan. The comparison shows that the model is too simple for a quantitative description of systems showing the Chemla effect. Rather a dependence of A'I and h'2 on the mixing ratio of the salts must be assumed. 
  Reference    Z. Naturforsch. 51a, 1229—1235 (1996); received October 20 1996 
  Published    1996 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-1229.pdf 
 Identifier    ZNA-1996-51a-1229 
 Volume    51 
183Author    A. Held, L. Ya, H. L. Baranov, E. W. Selzle, SchlagRequires cookie*
 Title    A Unified Mechanism for the Production of ZEKE States  
 Abstract    ZEKE states are highly stabilized Rydberg states which exist below each ionic eigenstate of a molecular system even high up into the continuum. The stability and neutrality of these states is the basis on which the high resolution ZEKE technique for the study of molecular ions is built upon. A new mechanism is proposed for the production of ZEKE states from optically accessible, relatively short lived Rydberg states. The mechanism is based on experimental results for a range of fields and ion concentrations. The experiments were performed with pulsed and static electric fields of different magnitudes at various ion concentrations. 
  Reference    Z. Naturforsch. 51a, 1236—1246 (1996); received November 18 1996 
  Published    1996 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-1236.pdf 
 Identifier    ZNA-1996-51a-1236 
 Volume    51 
184Author    S. R. LoganRequires cookie*
 Title    The Rationale of Trouton's Rule and of the Trouton-Hildebrand-Everett Rule  
 Abstract    In seeking a rational basis for the general rules regarding the enthalpy of vaporisation of a liquid, it is shown that whereas Trouton's Rule is consistent with the assumption that the effective molar volume, v, for translational motion in the liquid is a constant fraction (2 x 10" 5) of the molar vol-ume of vapour at 1 atm, the rather better approximation of Trouton, Hildebrand and Everett (THE), which corrects for the effects of varying molecular density in the vapour, re-quires that v be 1.5 cm 3 mol" 1 for all substances. The intro-duction of the apparently more reasonable assumption that v is a constant fraction of the molar volume of the liquid, is shown to lead to an expression exhibiting much poorer cor-relation. It thus offers no improvement to Trouton's rule nor to the THE rule. 
  Reference    Z. Naturforsch. 51a, 1247—1248 (1996); received October 9 1996 
  Published    1996 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-1247_n.pdf 
 Identifier    ZNA-1996-51a-1247_n 
 Volume    51