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Journal of the Serbian Chemical Society
2007, vol. 72, br. 5, str. 495-512
jezik rada: engleski
izvorni naučni članak
doi:10.2298/JSC0705495A

Volumetrijsko i viskozno karakterisanje i određivanje indeksa prelamanja amino kiselina u vodenom rastvoru glicerola
Department of Chemistry, Jamia Millia Islamia, New Delhi, India

e-adresa: anwar_jmi@yahoo.co.in

Sažetak

Gustine, viskoznost i indeksi prelamanja rastvora nekih amino kiselina (glicin, DL-alanin, DL - α - amino-n- buterna kiselina, L - valin i L-leucin ) koncentracija 0,02-0,10 m u 5 % v/v vodenom rastvoru glicerola određivane su na temperaturama 298,15, 303.15, 308.15 i 313.5 K. Iz eksperimentalnih podataka izračunate su prividne molarne zapremine, prividne molarne zapremine pri beskonačnom razblaženju, parcijalne molarne zapremine prelaza amino kiselina iz vodenih rastvora u vodeni rastvor glicerola, kao i A i B koeficijenti Jones-Dole-ove jednačine amino kiselina. Promene slobodne energije aktivacije viskoznog toka dobijene su primenom teorije prelaznog stanja na B koeficijent i određene su odgovarajuće promene entalpije i entropije aktivacije. Nađeno je da se prividna molarna zapremina pri beskonačnom razblaženju, B koeficijent i promena slobodne energije rastvorenih amino kiselina linearno menjaju sa povećanjem broja ugljenikovih atoma u alkilnom lancu amino kiselina i da se razdvajaju doprinosi cviterjonskog kraja NH3 + i COO- grupa, kao i metilenske ( CH2) grupe amino kiselina. Iz eksperimentalnih vrednosti indeksa prelamanja izračunate su molarne refrakcije ternarnih smeša amino kiselina i vodenog rastvora glicerola. Rezultati su interpretirani sa aspekta interakcija rastvorena supstanca-rastvarač i rastvorena supstanca-rastvorena supstanca u mešanom rastvaraču.

Ključne reči

apparent molar volumes; transfer volumes; viscosity B-coefficient; activationparameters; side-chain contributions

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