Svojstva homo- i heterometalnih kompleksnih spojeva priređenih upotrebom građevnih blokova tris(oksalato)kromata(III) i tris(oksalato)ferata(III) s alkil-amonijevim kationima

doctoral thesis

• Title (english): Properties of homo- and heterometallic complexes prepared using tris(oxalato)chromate(III) and tris(oxalato)ferrate(III) building blocks with alkyl-ammonium cations
• Author: Ana Lozančić
• Mentor: Marijana Jurić (mentor)
• Committee member: Željka Soldin (predsjednik povjerenstva)
• Committee member: Ana Šantić (član povjerenstva)
• Committee member: Jasminka Popović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2025-01-24, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry
• Universal decimal classification (UDC): 54 - Chemistry. Crystallography. Mineralogy

Abstract

Reakcijama vodenih otopina građevnih blokova [M(C2O4)3]3– (M = Cr3+, Fe3+) koji sadrže katione (CH3)2(C2H5)NH+ odnosno (CH3)(C2H5)2NH+ s jednostavnim solima prijelaznih metala (Cu2+, Mn2+ ili Co2+) uz dodatak N-donorskih liganada priređena su 23 nova spoja s ugrađenim alkil-supstituiranim kationima. Izolirano je 13 heterometalnih (8 [MnIICrIII], 3 [CoIICrIII], 1 [MnIIFeII] i
1 [CoIIFeIII]) i 10 homometalnih (7 [CrIII], 2 [FeIII] i 1 [MnII]) spojeva, različite nuklearnosti i dimenzionalnosti. Svojstva priređenih sustava istraživana su IR- i UV/Vis-spektroskopijom, termičkom analizom, difrakcijom rendgenskih zraka u monokristalu i prahu, te mjerenjem magnetizacije. Električna svojstva odabranih spojeva su istražena impedancijskom spektroskopijom mjerenjem ovisnosti vodljivosti o relativnoj vlažnosti i temperaturi. Tri izabrana heterometalna spoja istražena su kao molekulski prekursori za dobivanje čistih faza oksida spinelne strukture termičkom razgradnjom u jednom koraku. Četiri spinelna oksida su dobivena pirolizom smjese dvaju ili triju oksalatnih kompleksa pomiješanih u odgovarajućem omjeru. Svim oksidima istražena su (mikro)strukturna i optička svojstva, te fotokatalitička aktivnost u razgradnji organskih bojila pod vidljivim zračenjem bez i uz dodatak H2O2, a odabranima magnetska i električna svojstva.

Abstract (english)

By reacting aqueous solutions of the building blocks [M(C2O4)3]3– (M = Cr3+, Fe3+) containing cations (CH3)2(C2H5)NH+ or (CH3)(C2H5)2NH+ with simple salts of transition metals (Cu2+, Mn2+ or Co2+), with the addition of N-donor ligands, 23 new compounds with incorporated alkyl- substituted cations were prepared. 13 heterometallic (8 [MnIICrIII], 3 [CoIICrIII], 1 [MnIIFeII] and 1 [CoIIFeIII]) and 10 homometallic (7 [CrIII], 2 [FeIII] and 1 [MnII]) compounds with different nuclearity and dimensionality were isolated. The properties of the prepared compounds were investigated by IR and UV/Vis spectroscopy, thermal analysis, single-crystal and powder X-ray diffraction and magnetization measurements. The electrical properties of selected compouns were investigated using impedance spectroscopy by measuring the dependence of conductivity on relative humidity and temperature. Three selected heterometallic compounds were investigated as molecular precursors for the preparation of pure oxide phases with spinel structure by thermal decomposition in one step. Four spinel oxides were obtained by pyrolysis of a mixture of two or three oxalate complexes in a suitable ratio. The (micro)structural, optical and photocatalytic properties in the degradation of the organic dyes under visible irradiation without and with addition of H2O2 were investigated for all oxides, as well as the magnetic and electrical properties for selected oxides.

• Keywords: tris(oksalato) građevni blokovi; homometalni spojevi; iheterometalni spojevi; molekulski prekursori; mješoviti metalni oksidi; protonska vodljivost; fotokatalitička aktivnost
• Keywords (english): tris(oxalato) building blocks; homometallic compounds; heterometallic compounds; molecular precursors; mixed metal oxides; proton conductivity; photocatalytic activity
• Language: croatian
• URN:NBN: urn:nbn:hr:217:568415
• Promotion: 2025
• Project: Number: IP-2019-04-5742; Title: Topološka raznolikost oksalatnih spojeva: sinteza, svojstva i upotreba za okside; Title: Topological Versatility of Oxalate-Based Compounds: Synthesis, Properties and Oxide-Related Usage; Acronym: TOPOXAL-SYPROXID; Leader: Marijana Jurić; Jurisdiction: Croatia; Funder: Hrvatska zaklada za znanost; Funding stream: Research Projects
• Study programme: Title: Doctoral study; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica u području prirodnih znanosti (doktor/doktorica u području prirodnih znanosti)
• Type of resource: Text
• Extent: LIV, 174 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-01-31 14:04:24