Derivati iminokumarina kao potencijalni fluorescentni pH senzori

undergraduate thesis

• Title (english): Iminocoumarine derivatives as potential fluorescent pH sensors
• Author: Andrea Martinović
• Mentor: Lidija Furač (mentor)
• Committee member: Lidija Furač (predsjednik povjerenstva)
• Committee member: Nataša Perin (član povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Applied Chemistry

Abstract

Svrha ovog rada jest optička karakterizacija kiselo-baznih svojstava novih derivata iminokumarina u otopinama s ciljem utvrđivanja njihove potencijalne senzorske primjene. Ovim radom određen je utjecaj strukture na svojstva spojeva 2-imino-3-(2-N-metilbenzimidazolil)kromen (IM1), 7-N,N-dietilamino-2-imino-3-(2-N-metilbenzimidazolil)kromen (IM2) i 7-N,N-dietilamino-2-imino-3-(2-N-5-nitro-1H-benzimidazolil)kromen (IM3) te je procijenjena njihova primjenjivost u senzorima za pH. Ispitivani spojevi spektralno su okarakterizirani u univerzalnom puferu i/ili etanolnim otopinama u rasponu vrijednosti pH od 1,00 do 13,00 primjenom UV-vidljive fluorescencijske i apsorpcijske spektrofotometrije. Također, utvrđen je utjecaj otapala na kiselo-bazna i spektralna svojstva ispitivanih spojeva.
Spektrofotometrijskom karakterizacijom u otopinama utvrđeno je da se spomenuti derivati iminokumarina mogu koristiti kao potencijalni fluorescentni pH senzori. Točnije, karakterizacijom kiselo-baznih svojstava pokazalo se kako su spojevi 2-imino-3-(2-N-metilbenzimidazolil)kromen (IM1) i 7-N,N-dietilamino-2-imino-3-(2-N-metilbenzimidazolil)kromen (IM2) puno bolji pH senzori od 7-N,N-dietilamino-2-imino-3-(2-N-5-nitro-1H-benzimidazolil)kromena (IM3). Važno je također spomenuti da su spomenuti spojevi okarakterizirani na Zavodu za opću i anorgansku kemiju kao potencijalne solvatokromne probe te kao optički senzori u otopinama i plastificiranoj polimernoj matrici.

Abstract (english)

The main idea of this work is the characterisation of novel iminocoumarine derivatives in order to determine their applicability as pH sensors. Structure – property relation and effect of pH is determined for compounds 2-imino-3-(2-N-methylbenzimidazolyl)chromen (IM1), 7-N,N-diethylamino-2-imino-3-(2-N-methylbenzimidazolyl)chromen (IM2) and 7-N,N-diethylamino-2-imino-3-(2-N-5-nitro-1H-benzimidazolyl)chromen (IM3) Compunds were characterised in the universal buffer solutions and/or ethanol solutions in the pH range 1,00 to 13,00 by UV-Visible flourescence and absorption spectrophotometry. Also, effect of solvent on acid - base properties of examined compounds was investigated.
Examined iminocoumarine derivatives can be used as a potential fluorescent pH sensors. It has been shown that compounds 2-imino-3-(2-N-methylbenzimidazolyl)chromen (IM1) and 7-N,N-diethylamino-2-imino-3-(2-N-methylbenzimidazolyl)chromen (IM2) are better pH sensors than 7-N,N-diethylamino-2-imino-3-(2-N-5-nitro-1H-benzimidazolyl)chromen (IM3). Also, it is important to mention that investigated compounds are previously characterised as a potential solvatochromic probes and optical sensors in solutions and polymer matrices.

• Keywords: pH senzori; fluorescencija i apsorpcija; derivati iminokumarina
• Keywords (english): fluorescent pH sensors; fluorescence and absorbance; iminocoumarine derivatives
• Language: croatian
• URN:NBN: urn:nbn:hr:149:380350
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-11-26 15:27:28