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'Pyrazine' in keywords Facet   section ZfN Section A  [X]
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1995 (1)
1987 (1)
1Author    G. Brolo, DonaldE. IrishRequires cookie*
 Title    Alexandre  
 Abstract    Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday Raman spectra of aqueous pyrazine have been investigated in acidic media: HCl from pH = 4 up to 11 M; HC104 from 0.1 M to 12 M; H2S04 form 0.1 M to 18 M. From observation of the shifts of the bands from neutral solutions, it has been possible to identify bands uniquely characteristic of unprotonated pyrazine and its two protonated forms. The diprotonated form was only observed for high concentrations of HC104 and H2S04. From bandfitting of the spectral contours it has been possible to construct the species distribution diagram and estimate the pK values. Raman bands of the three species have been identified and assigned. The results are used to explain an unassigned band at 1235 cm-1, reported by several authors, in SERS from pyrazine on silver and gold elec­ trodes. R a m a n S p e c tr a l S tu d ie s o f A q u e o u s A c id ic P y r a z in e S o lu tio n s 
  Reference    Z. Naturforsch. 50a, 274—282 (1995); received October 31 1994 
  Published    1995 
  Keywords    Pyrazine, Pyrazinium, SERS, Raman spectroscopy 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0274.pdf 
 Identifier    ZNA-1995-50a-0274 
 Volume    50 
2Author    Karl Hensen, Jens GaedeRequires cookie*
 Title    Thermodynamische Interpretation der Schmelzdiagramme binärer Systeme aus Methylchlorsilanen und Pyridazin bzw. Pyrazin  
 Abstract    By analyzing the cooling curves and the resulting melting point diagrams of the chloro-methylsilane-pyridazine and pyrazine systems the existence of the incongruently melting addition compounds CH 3 SiCl 3 • Pyridazine, (CH 3) 2 SiCl 2 • (Pyridazine) 2 , (CH 3) 3 SiCl • (Pyridazine) 2 , CH 3 SiCl 3 • (Pyrazine) 2 , (CH 3) 2 SiCl 2 • (Pyrazine) 2 , (CH 3) 3 SiCl • (Pyrazine) 2 was proved. By electro-optical measurements of the turbidity point it was proved that the system (CH 3) 3 SiCl-Pyridazine exhibits a miscibility gap which intersects the liquidus curve of the amine. Based on certain approximations it was possible to fit thermodynamic functions to the experimental results to obtain the excess data of mixing of the corresponding systems. These data allow for a more profound understanding of the Lewis-acid base behaviour of the silanes and amines. A) Experimentelle Ergebnisse 
  Reference    Z. Naturforsch. 42a, 341—351 (1987); eingegangen am 23. Juli 1986 
  Published    1987 
  Keywords    Chloromethylsilanes, Pyridazine, Pyrazine, Phase Diagrams, Addition Compounds, Thermo-dynamic Excess Functions 
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 TEI-XML for    default:Reihe_A/42/ZNA-1987-42a-0341.pdf 
 Identifier    ZNA-1987-42a-0341 
 Volume    42