20.500.12556/RUL-185994 Sinteza zeolitnih imidazolatnih ogrodij z uporabo cinkovega oksida Synthesis of zeolitic imidazolate frameworks using zinc oxide Zeolitna imidazolatna ogrodja (ang. Zeolitic imidazolate frameworks ZIF) so podskupina kristaliničnih kovinsko-organskih poroznih materialov (ang. Metal organic frameworks MOF), pri katerih kovinski ion (največkrat Zn2+ ali Co2+) skupaj z imidazolatnimi povezovalci tvorijo zeolitom podobne tridimenzionalne strukture. Da se izognemo majhnim izkoristkom na račun padajočega pH kot posledica kisline, ki nastane pri reakciji, uporabimo cinkov oksid, s pomočjo katerega je produkt reakcije voda. Za učinkovitejši prenos protona z imidazolatnega povezovalca uporabimo kislino, ki neposredno vpliva na kinetiko kemijske reakcije. V okviru diplomskega dela sem pripravila ZIF-93 in ZIF-71. Kot topilo za reakcijo sem uporabila okolju prijaznejši metanol ter mravljično kislino, da ima enako stransko skupino kot metanol – metil. Opazovala sem hitrost nastanka produktov glede na količino mravljične kisline v topilu, vpliv mešanja ter vpliv prisotnosti vode pri reaktantih in produktih sinteze ZIF-71. Fazno sestavo vzorcev sem analizirala z rentgensko praškovno difrakcijo ter z metodo Rietveldovega prilagajanja. Zeolitic imidazolate frameworks (ZIFs) are a subgroup of crystalline porous materials known as metal-organic frameworks (MOFs) in which zeolite-like three-dimensional structures are formed by coordinating metal ions (typically Zn or Co) with imidazolate linkers. To avoid low level yields caused by a decrease in pH resulting from the acid formed during reaction, zinc oxide is used as the zinc precursor. This ensures that water is the only by-product of the reaction. Additionally, formic acid is used to achieve a more efficient proton transfer from the imidazolate linker, which directly affects the kinetics of the chemical reaction. In this work, ZIF-93 and ZIF-71 were synthesised. Methanol was used as an environmentally friendly solvent, along with formic acid with the same side group as methanol (methyl). The rate of product formation was investigated as a function of the formic acid concentration in the solvent. Furthermore, the effect of stirring and the effect of water present among reactants or products in the synthesis of ZIF-71 were evaluated. Phase analysis was performed using X-ray powder diffraction and the Rietveld refinement method. ZIF-93 ZIF-71 rentgenska praškovna difrakcija kvantitativna analiza ZIF-93 ZIF-71 X-ray powder diffraction quantitative analysis true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-08-25 14:10:05 2026-08-25 14:10:16 2026-08-26 04:13:07 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 25904 Celar_Lara_-_Sinteza_zeolitnih_imidazolatnih_ogrodij_z_uporabo_cinkovega_oksida.pdf Celar_Lara_-_Sinteza_zeolitnih_imidazolatnih_ogrodij_z_uporabo_cinkovega_oksida.pdf 1 B01D47C91EAFB0BB550BC0E46AF305FD c77013bbb4a38c4765fb37ca9ba32e4a29201d2a1ccfd8bc534b1730482cdf01 867adaa8-a07d-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=245033 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0