20.500.12556/RUL-178254 Reakcije nikljevih ali cinkovih soli s pirazol-3-karboksilno kislino Reactions of nickel or zinc salts with pyrazole-3-carboxylic acid Izvedli smo reakcije med nikljevim(II) kloridom, nikljevim(II) nitratom heksahidratom, nikljevim(II) sulfatom heptahidratom, cinkovim kloridom ali cinkovim acetatom dihidratom s pirazol-3-karboksilno kislino (H$_2$pza) v topilih: voda, metanol, piridin ali acetonitril ob dodatku klorovodikove kisline. Množinska razmerja med cinkovimi oziroma nikljevimi ioni in H$_2$pza so bila 1 : 2. Sinteze so potekale v vodi pri temperaturi 80 °C, v ostalih topilih pa pri sobni temperaturi. Kristalizacija je potekala na zraku ali pa v zaprtem sistemu z znižanim tlakom. Izolirali smo kristale že znanih spojin [Ni(Hpza)$_2$(H$_2$O)$_2$] in [Zn(Hpza)$_2$(H$_2$O)$_2$], kar smo potrdili z rentgensko strukturno analizo. Sintetizirali smo tudi nove spojine [Ni(Hpza)$_2$(py)$_2$]$_2$⋅py, [NiCl$_2$(HpzaMe)$_2$], [NiCl$_2$(H$_2$pza)$_2$]⋅2H$_2$O in [ZnCl$_2$(HpzaMe)$_2$]. Strukturo kompleksov [Ni(Hpza)$_2$(py)$_2$]$_2$⋅py in [ZnCl$_2$(HpzaMe)$_2$] smo določili z rentgensko strukturna analizo. Uporabili smo tudi druge analitske metode, kot so: infrardeča spektroskopija, CHN analiza in termična analiza. Ugotovili smo, da je deprotonacija H$_2$pza in koordinacija Hpza$^-$ na cinkov ali nikljev ion potekla v vodi, če reakcijski zmesi nismo dodali klorovodikove kisline. V metanolu je v prisotnosti klorovodikove kisline H$_2$pza reagirala, tvorila je ester, tako sta se na nikljev ali cinkov ion pri teh pogojih koordinirali dve molekuli estra HpzaMe. V aprotičnem topilu, acetonitrilu, v prisotnosti klorovodikove kisline deprotonacija H$_2$pza ni potekla, na nikljev ion sta se koordinirali dve molekuli H$_2$pza. We conducted reactions between nickel(II) chloride, nickel(II) nitrate hexahydrate, nickel(II) sulfate heptahydrate, zinc chloride, or zinc acetate dihydrate and pyrazole-3-carboxylic acid (H$_2$pza) in water, methanol, pyridine, or acetonitrile with a catalytic amount of hydrochloric acid. The molar ratio of nickel or zinc ions to H$_2$pza was 2 : 1. Reactions were carried out in water at 80 °C and in other solvents at room temperature. Crystallizations were performed in air at room temperature or in a closed system under reduced pressure. We isolated crystals of the known compounds [Ni(Hpza)$_2$(H$_2$O)$_2$] and [Zn(Hpza)$_2$(H$_2$O)$_2$], as confirmed by X-ray structure analysis. We also synthesized four new compounds: [Ni(Hpza)$_2$(py)$_2$]$_2$⋅py, [NiCl$_2$(HpzaMe)$_2$], [NiCl$_2$(H$_2$pza)$_2$]⋅2H$_2$O, and [ZnCl$_2$(HpzaMe)$_2$]. The structures of [Ni(Hpza)$_2$(py)$_2$]$_2$⋅py and [ZnCl$_2$(HpzaMe)$_2$] were determined by X-ray structural analysis. We also used other analytical methods such as infrared spectroscopy, CHN elemental analysis, and thermal analysis. We concluded that the processes of H$_2$pza deprotonation and Hpza$^–$ coordination to the nickel or zinc ion occurred in water without the addition of hydrochloric acid to the reaction mixture. In methanol, with the addition of hyrdochloric acid, H$_2$pza reacted and formed an ester; thus, two molecules of the ester HpzaMe coordinated to the nickel or zinc ion under these conditions. In the aprotic solvent acetonitrile, in the presence of hydrochloric acid, deprotonation of H$_2$pza did not occur, and two molecules of H$_2$pza coordinated to the nickel ion. pirazol-3-karboksilna kislina nikelj cink koordinacijske spojine pyrazole-3-carboxylic acid nickel zinc complex compounds true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-01-22 10:05:04 2026-01-22 10:05:08 2026-01-30 12:58:55 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 25708 266811651 Geohelli_Blaz_-_Reakcije_nikljevih_ali_cinkovih_soli_s_pirazol-3-karboksilno_kislino.pdf Geohelli_Blaz_-_Reakcije_nikljevih_ali_cinkovih_soli_s_pirazol-3-karboksilno_kislino.pdf 1 4C1D00C57D6FF23A06785AC704DC43F7 ecaede5ead3abdd8a449bdc868199553f4045e15d3b5ab7c8b0f45975a5c0c35 74bc4deb-f771-11f0-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=225913 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0