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'Protonation' in keywords Facet   Publication Year 1988  [X]
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1988[X]
1Author    A. Heinrich, W. PreetzRequires cookie*
 Title    Darstellung und Schwingungsspektren von Alkyl-und Rhodanohydrohexaboraten Preparation and Vibrational Spectra of Alkyl and Rhodano Hydrohexaborates  
 Abstract    Treatment of B 6 H 6 2 " with iodoalkanes and (SCN) 2 in organic solvents affords the monosubsti-tuted protonated hexaborates RB 6 H 6 ", R = CH 3 , C 2 H 5 < C 3 H 7 , C 4 H 9 , C 8 H 17 and SCN, respective-ly. The acidity constants of these weak Brönsted acids range for the alkylated species from 8.8 to 9.6, and for R = SCN the pk a value is ~5. From basic solutions the salts Cs 2 RB 6 H 5 can be precipitated, which show band patterns in the IR and Raman spectra typical for monosubstituted hydrohexaborates. The protonated compounds RB 6 H 6 " are distinguished from the corresponding Brönsted bases RB 6 H 5 2 " by a high frequency shift of the BH stretching vibrations in the order of 100 cm" 1 . For Cs 2 (SCN)B 6 H 5 , S coordination of SCN" is supposed because of the high frequency of v CN : 2144 cm" 1 . 
  Reference    Z. Naturforsch. 43b, 1327—1331 (1988); eingegangen am 8. Juli 1988 
  Published    1988 
  Keywords    Alkylhydrohexaborates, Rhodanohydrohexaborate, Protonation, IR Spectra, Raman Spectra 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1327.pdf 
 Identifier    ZNB-1988-43b-1327 
 Volume    43