Poređenje teorijskog i eksperimentalnog ispitivanja procesa protonacije nekih tionova u kiselim medijima

Autori

  • Mirjana S. Jankulovska Ss.Cyril and Methodius University, Faculty of Agricultural Sciences and Food, Skopje, North Macedonia Autor
  • Vesna Dimova Ss.Cyril and Methodius University, Faculty of Technology and Metallurgy, Skopje, North Macedonia Autor
  • Ilinka Spirevska Ss.Cyril and Methodius University, Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Skopje, North Macedonia Autor
  • Milena Jankulovska University St. Kliment Ohridski, Faculty of Veterinary Medicine, Skopje, North Macedonia Autor

DOI:

https://doi.org/10.5937/zasmat2101009J

Ključne reči:

1,2,4-triazolin-3-tioni, protonacija, konstante disocijacije, afinitet protona, UVspektrofotometrija, PM3 poluempirijska metoda

Apstrakt

PM3 poluempirijska metoda korišćena je za kvantno-hemijsko istraživanje kako bi se istražila elektronska svojstva i odredio centar za protonaciju u 1,2,4-triazolin-3-tionu. Potvrda centra za protonaciju u kiselom mediju ispitivanih jedinjenja izvršena je korišćenjem vrednosti atomskog naboja, kao i vrednosti protonskog afiniteta. Rezultati poluempirijskih izračunavanja pokazali su da je centar za protonaciju u molekulu tiona bio atom sumpora. Ponašanje tiona ispitivano je u mineralnom kiselinskom medijumu pomoću UV spektroskopije. Uticaj snage kiseline i priroda njenog aniona na proces protonacije diskutovana je korišćenjem tri različite mineralne kiseline za protonaciju (perhlorna, hlorovodonična i fosforna kiselina). Proces protonacije u perhlornoj i hlorovodoničnoj kiselini odvijao se u jednom koraku, dok u fosfornoj kiselini nije završen ni kada je koncentracija imala maksimalnu vrednost. Vrednosti konstante disocijacije protoniranih oblika (pKBH+) i parametar solvatacije m* izračunate su u skladu sa metodom funkcije "višak kiselosti" (Cox and Yates) koristeći podatke apsorpcije iz eksperimentalnih i rekonstruisanih spektra (Karakteristična VektorskaAnaliza - CVA). Određene vrednosti pKBH+ u hlorovodoničnoj kiselini imale su više negativne vrednosti od onih dobijenih u medijumu perhlorne kiseline. Vrednosti pKBH+ bile su u saglasnosti sa literaturnim podacima za ovu klasu jedinjenja.

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2021-03-15

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