Kobaltove spojine z benzojsko kislino

Marinč, Nika (author), Kozlevčar, Bojan (mentor)

Sintetizirala sem tri kobaltove(II) koordinacijske spojine z anionom benzojske kisline (C7H6O2 = HL) iz izhodnega kobaltovega(II) nitrata heksahidrata. V dveh primerih sem uporabila tudi dodaten nevtralen dušikov donorski ligand nikotinamid oziroma 2-aminopiridin. Kot topilo sem uporabila vodo ali acetonitril. Nastale so spojina Co(L)(OH) 1, spojina [Co(L)2(C6H6N2O)2(H2O)2] 2 in spojina [Co(L)2(C5H6N2)2] 3. Prisotnost Co(II) pri vseh spojinah je najbolj jasna v UV-Vis spektru s trakom pri 500 nm. V IR spektrih opazimo O-H in N-H trakove nad 3000 cm-1 za različne dodatne ligande poleg benzoatnega aniona. Nižja vrednost magnetnega momenta pri spojini 1 od ostalih dveh se sklada z UV delom UV-Vis spektra, saj nakazuje drugačno, verjetno mostovno povezavo ligandov pri tej spojini.

• Language: Slovenian
• Keywords: kobalt(II), benzojska kislina, nikotinamid, 2-aminopiridin, acetonitril, voda
• 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-116207
• COBISS.SI-ID: 16697091
• Publication date in RUL: 23.05.2020

Secondary language

• Language: English
• Title: Cobalt compounds with bezoic acid

Abstract

Three coordination compounds with benzoic acid anion (C7H6O2 = HL) were synthesized using cobalt(II) nitrate hexahydrate. A neutral nitrogen donor ligands nicotinamide and 2-aminopyridine were additionally added in two cases. Either water or acetonitrile were applied as a solvent. Thus, Co(L)(OH) 1, [Co(L)2(C6H6N2O)2(H2O)2] 2 and [Co(L)2(C5H6N2)2] 3 compounds were isolated. A Co(II) presence in all compounds is most clearly visible within UV-Vis spectra with a band ati 500 nm. The IR spectra reveal O-H and N-H bands above 3000 cm-1 due to different additional ligands besides the initial benzoat anion. A lower magnetic moment value for the compound 1 compared to the others, is in agreement with the UV section of the UV-Vis spectra, suggesting different, probably bridging ligand coordination, only for this compound.

• Keywords: cobalt(II), benzoic acid, nicotinamide, 2-aminopyridine, acetonitrile, water