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  Global Journal of Analytical Chemistry. Volume 2, Issue 3 (2011) pp. 114-124
  Research Article
 
Vibrational analysis of 4, 4'-methylene diphenyl diisocyanate
  G. A. Pitsevicha, Maksim Shundalaua, M. A. Ksenofontovb, D. S. Umreikob  
     
a Physics Faculty, Belarusian State University (BSU) Minsk, Belarus
b A.N. Sevchenko Research Institute for Applied Physical Problems of BSU, Minsk, Belarus

   
  Abstract  
  Vibrational Raman and FT-IR absorption spectra of 4,4'-methylene diphenyl diisocyanate (MDI) have been recorded. The ab initio and density functional theory calculations (B3LYP/cc-pVDZ) have been performed for the MDI geometric structure and force field. The fully optimized structure has been obtained using Quadratic Approximation gradient method and is proved by its Hessian. Vibrational spectra have been simulated; bands and lines in IR or Raman spectra of the MDI molecule have been identified and attributed.
     
  Keywords  
  IR and Raman spectra; 4,4'-methylene diphenyl diisocyanate; Ab initio computations; DFT; Force field scaling  
     
   
   
   
   
     

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