Priprava kompleksnih spojeva molibdena(VI) s derivatima hidrazida octene kiseline

master's thesis

• Title (english): Preparation of molybdenum(VI) complexes with acetic acid hydrazide derivatives
• Author: Matea Pajski
• Mentor: Jana Pisk (mentor)
• Committee member: Jana Pisk (predsjednik povjerenstva)
• Committee member: Morana Dulić (član povjerenstva)
• Committee member: Davor Kovačević (član povjerenstva)
• Committee member: Mirta Rubčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2023-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Kompleksni spojevi molibdena(VI) i hidrazonskih liganada su vrlo dobar modelni sustav za
proučavanje enzimske aktivnosti molibdena u biološkim sustavima te se također koriste i kao
katalizatori mnogobrojnih reakcija. U sklopu ovog rada pripremljena su dva hidrazonska
liganda, derivati hidrazida octene kiseline i 2-hidroksibenzaldehida (H2L
1
), odnosno 2-hidroksi5-nitrobenzaldehida (H2L
2
). Reakcijama dioksobis(pentan-2,4-dionato)molibdena(VI) i
odgovarajućeg hidrazonskog liganda uz zagrijavanje pripravljeni su kompleksni spojevi
molibdena(VI). Mononuklearni kompleksni spojevi molibdena(VI), [MoO2(L)(D)] (L2–
=deprotonirani ligand, D=molekula otapala), sintetizirani su reakcijama u metanolu, etanolu i
acetonitrilu, a polinukleani kompleksni spojevi molibdena(VI), [MoO2(L)]n, dobiveni su
zagrijavanjem mononuklearnih spojeva na odgovarajuću temperaturu. Dobiveni hidrazonski
ligandi i kompleksni spojevi molibdena(VI) identificirani su i analizirani metodama infracrvene
spektroskopije, razlikovne pretražne kalorimetrije i termogravimetrijske analize. Kristalne i
molekulske strukture mononuklearnih kompleksa [MoO2(L1
)(MeOH)], [MoO2(L2
)(MeOH)],
[MoO2(L1
)(H2O)] i [MoO2(L2
)(EtOH)] određene su difrakcijom rentgenskih zraka na
jediničnom kristalu.

Abstract (english)

Molybdenum(VI) complexes with hydrazone ligands are an excellent model system for
studying the enzymatic activity of molybdenum in biological systems, also, they are used as
catalysts of many reactions. As a part of this thesis, two hydrazone ligands, derivatives of acetic
acid hydrazide and 2-hydroxybenzaldehyde (H2L
1
) or 2-hydroxy-5-nitrobenzaldehyde (H2L
2
)
were prepared. By reacting dioxobis(pentane-2,4-dionato)molybdenum(VI) and a
corresponding hydrazone ligand under high-temperature conditions, molybdenum(VI)
complexes were prepared. Mononuclear complexes of molybdenum(VI), [MoO2(L)(D)] (L2–
=deprotonated ligand, D=solvent molecule) were synthesized by reactions in methanol, ethanol,
and acetonitrile, while the polynuclear complexes of molybdenum(VI), [MoO2(L)]n were
obtained by heating the mononuclear complexes to an appropriate temperature. Obtained
hydrazone ligands and molybdenum(VI) complexes were identified and analyzed by infrared
spectroscopy, differential scanning calorimetry, and thermogravimetry. Crystal and molecular
structures of mononuclear complexes [MoO2(L1
)(MeOH)], [MoO2(L2
)(MeOH)],
[MoO2(L1
)(H2O)] and [MoO2(L2
)(EtOH)] were determined by using single crystal X-ray
diffraction.

• Keywords: hidrazid octene kiseline; hidrazon; kompleksi molibdena(VI); mononuklearni kompleksni spojevi; polinuklearni kompleksni spojevi
• Keywords (english): acetic acid hydrazide; hydrazone; molybdenum(VI) complexes; mononuclear complexes; polinuclear complexes
• Language: croatian
• URN:NBN: urn:nbn:hr:217:101299
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-09-22
• Created on: 2023-10-17 12:19:19