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    STUDIA PHYSICA - Issue no. 1 / 2004  
         
  Article:   PH DEPENDENCE OF THE FREE AND ADSORBED PAPAVERINE MOLECULAR SPECIES. VIBRATIONAL APPROACH.

Authors:  N. LEOPOLD, SIMONA CINTĂ PÂNZARU, M. BAIA, C. LEHENE, O. COZAR, WOLFGANG KIEFER.
 
       
         
  Abstract:  The Raman spectra of papaverine aqueous solutions at acid pH values, as well as SERS spectra of papaverine adsorbed to colloidal silver surfaces at different acid and basic pH values were recorded and the assignments of papaverine vibrational modes were accomplished on the basis of density functional theory (DFT) calculations. The pH dependence Raman study is possible in the pH range under 6.5, for upper values the solubility being dramatically diminished. The pH dependence SERS spectra of papaverine reveals the chemisorption of the protonated and the neutral papaverine molecules to colloidal silver particles, as well as the coexistence of both molecular species adsorbed to the silver surface. The orientations to the silver surface of the two molecular species were discussed.  
         
     
         
         
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