Nikljeve in kobaltove spojine s citronsko kislino

Zarnik, Boštjan (author), Kozlevčar, Bojan (mentor)

Sintetiziral sem eno kobaltovo(II) spojino in eno nikljevo(II) spojino z anionom citronske kisline (H4L = C6H8O7) in (CN3H6)4[Ni(HL)2](H2O)2. V obeh strukturah molekule vode in gvanidinijevi kationi stabilizirajo koordinacijsko zvrst z naboji in vodikovimi vezmi. Ti spojini sta izostrukturni s formulo (CN3H6)8[M4(L)4](H2O)8. Citratni anion je štirikrat deprotoniran 4 (L). Poskušal sem izolirati tudi druge podobne spojine, a mi nedvoumna sinteza in karakterizacija le teh ni povsem uspela. IR spektri izoliranih spojin so si zelo podobni zaradi istih sestavnih enot. Razlike se vidijo v UV-Vis spektrih, zaradi različne koordinacijske sfere in drugega kovinskega iona. Slednje je očitno predvsem pri magnetnih meritvah zaradi dveh nesparjenih elektronov pri Ni(II) oziroma treh pri Co(II), ki je visokospinski.

• Language: Slovenian
• Keywords: Nikelj, kobalt, citronska kislina, gvanidin, struktura
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2020
• PID: 20.500.12556/RUL-113755
• COBISS.SI-ID: 1538523587
• Publication date in RUL: 31.01.2020

Secondary language

• Language: English
• Title: Nickel and cobalt compounds with citric acid

Abstract

One cobalt(II) compound and one nickel(II) compound with citric acid anion (H4L = C6H8O7) have been synthesized. Water molecules and guanidinium cations are bonded stabilizing coordination moieties via net charges and hydrogen bonds. Both compounds are isostructural (CN3H6)8[M4(L)4](H2O)8. The citrat anion in these two compounds is fourtimes deprotonated 4- (L). An isolation of other similar compounds was also tried, however no clear synthesis along with the product characterization was succesfull. IR spectra of the isolated compounds are very similar due to the same coordination moieties. The differences among them are noticed clearly in the UV-Vis spectra due to different coordination spheres as well as another metal ion. The later is obvious especially at the magnetic data for two unpaired electrons per Ni(II) or three per Co(II) the later in high spin arrangement.

• Keywords: Nickel, cobalt, citric acid, guanidine, structure