Bakrove spojine s pirazinojsko kislino

Stopar, Andrej (author), Petriček, Saša (mentor)

Sintetizirali smo kristalinične komplekse iz bakrovih(II) soli in pirazinojske kisline. Uporabili smo bakrov(II) nitrat, sulfat ali klorid, ki smo mu dodali pirazinojsko kislino in topilo. Sinteze so potekale v acetonitrilu, etanolu ali mešanici teh topil z vodo. V nekaterih poskusih smo dodali koncentrirano klorovodikovo, žveplovo ali dušikovo kislino in opazovali njen vpliv na potek reakcije. V večini poskusov je nastal eden izmed dveh produktov, dipirazinoatobaker(II) [Cu(pyza)$_2$] ali diakvadipirazinoatobaker(II) [Cu(H$_2$O)$_2$(pyza)$_2$]. Kompleks, v katerem se je koordinirala molekula pirazinojske kisline, je nastal le ob dodatku koncentrirane klorovodikove kisline v zmes bakrovega(II) klorida in pirazinojske kisline v acetonitrilu. Izolirali smo kompleks s formulo [CuCl$_2$(pyzaH)$_2$]·2H$_2$O. Med prekristalizacijo tega produkta v zaprtem sistemu pri nižjem tlaku je nastal kristalinični kompleks [CuCl(H$_2$O)(pyza)]$_n$. Za vse produkte smo posneli IR spektre, za nekatere vzorce pa je bila izvedena tudi termična, elementna, rentgenska praškovna in rentgenska strukturna analiza.

• Language: Slovenian
• Keywords: baker, pirazinojska kislina, koordinacijska kemija.
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2024
• PID: 20.500.12556/RUL-155104
• COBISS.SI-ID: 189916931
• Publication date in RUL: 20.03.2024

Secondary language

• Language: English
• Title: Copper compounds with pyrazinoic acid

Abstract

We have synthesized crystalline complexes from copper(II) salts and pyrazinoic acid. We used copper(II) nitrate, sulfate and chloride, to which we added pyrazinoic acid and a solvent. The syntheses were done in acetonitrile, ethanol or mixtures of these solvents with water. In some experiments we also added concentrated hydrochloric, sulfuric or nitric acid and observed its effect on the reaction. Most experiments resulted in one of two products, dipyrazinoatocopper(II) [Cu(pyza)$_2$] or diaquadipyrazinoatocopper(II) [Cu(H$_2$O)$_2$(pyza)$_2$]. A complex, in which a molecule of pyrazinoic acid was coordinated, was only produced with the addition of concentrated hydrochloric acid. We isolated a complex with the formula [CuCl$_2$(pyzaH)$_2$]·2H$_2$O. During recrystallization of this product in a closed system at low pressure the crystalline complex [CuCl(H$_2$O)(pyza)]$_n$ was formed. IR spectra were recorded for all products, thermal, elemental, X-ray diffraction and X-ray structural anaylsis were also carried out for some samples.

• Keywords: copper, pyrazinoic acid, coordination chemistry