Premium
Effects of inorganic salts on the spectral behavior of poly( N ‐vinyl‐2‐pyrrolidone) in aqueous solutions
Author(s) -
Güner Ali
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000314)75:11<1434::aid-app16>3.0.co;2-n
Subject(s) - aqueous solution , bathochromic shift , salt (chemistry) , chemistry , cationic polymerization , solvent , 2 pyrrolidone , polymer , polymer chemistry , polyelectrolyte , inorganic chemistry , organic chemistry , fluorescence , physics , quantum mechanics
Electronic spectral behavior of poly( N ‐vinyl‐2‐pyrrolidone) (PVP) was determined in aqueous solutions including a variety of inorganic salts (phosphates, mono‐ and dihydrogen phosphates, sulfates, chlorides, nitrates, bisulfites, and persulfates) for several concentrations. The n → π* excitations are shifted to longer wavelengths depending on the nature and the concentration of salt. The resulting dependence of λ max on the molar concentration can be expressed to show the increasing effect of anionic and cationic species in bathochromic shift. The increasing order of effectiveness of anions in shifting the λ max is S 2 O 8 = > S 2 O 5 = > PO 4 3− > HPO 4 2− > SO 4 2− > H 2 PO 4 2− > Cl − . The order for the cation is as Na + ≈ K + ≈ NH 4 + in the 0.1–0.6 M concentration range and Na + ≈ K + > NH 4 + in > 0.6 M aqueous solutions. The changes observed in λ max by the salt were correlated with the changes occurring in the structure of water and the polymer–solvent interactions. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1434–1439, 2000