Priprava i katalitička aktivnost kompleksnih spojeva molibdena(VI) s derivatima 2,4-dihidroksibenzaldehida

master's thesis

• Title (english): Synthesis and catalytic activity of molibdenum(VI) complexes with 2,4-dihydroxybenzaldehyde derivatives
• Author: Arijeta Bafti
• Mentor: Jana Pisk (mentor)
• Committee member: Jana Pisk (predsjednik povjerenstva)
• Committee member: Sanda Rončević (član povjerenstva)
• Committee member: Tajana Begović (član povjerenstva)
• Committee member: Mirta Rubčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2019-11-15, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U okviru ovog rada pripravljena su dva hidrazonska liganda, derivati 2,4-dihidroksibenzaldehida s
2-aminobenzhidrazidom (H2L1), odnosno 4-aminobenzhidrazidom (H2L2). Reakcijom
[MoO2(acac)2] i odgovarajućeg aminobenzhidrazona, H2L1,2, pripravljeni su kompleksni spojevi
molibdena(VI). Mononuklearni kompleksni spojevi, [MoO2(L)(MeOH)], su dobiveni iz metanolne
otopine, a dinuklearni, [MoO2(L)]2, i polinuklearni, [MoO2(L)]n, iz acetonitrilnih otopina.
Kompleksni spojevi su identificirani i analizirani metodom infracrvene spektroskopije, nuklearne
magnetske rezonancije, termogravimetrijskom i elementnom analizom. Difrakcijom rentgenskog
zračenja na jediničnom kristalu je određena molekulska i kristalna struktura oba liganda i
dinuklearnog kompleksnog spoja molibdena(VI), [MoO2(L1)]2. Katalitička aktivnost pripravljenih
dinuklearnih i polinuklearnih spojeva ispitana je u reakcijama (ep)oksidacije cikloheksena s
različitim oksidansima (vodenom otopinom tert-butil hidroperoksida, tert-butil hidroperoksidom u
dekanu i otopinom vodikova peroksida), u uvjetima bez dodataka dodatnih organskih otapala u
reakcijsku smjesu. Provedene katalitičke reakcije potpomognute su mikrovalnim zračenjem.

Abstract (english)

As part of this diploma thesis, synthesis of two hydrazine ligands, derivatives of 2,4-
dihydroxybenzaldehyde with 2-aminobenzhydrazide (H2L1) or 4-aminobenzhydrazide (H2L2).
By the reaction of [MoO2(acac)2] and corresponding aminobenzhydrazone ligand, complexes
of molybdenum(VI) were synthesized. Two mononuclear complexes [MoO2(L)(MeOH)] were
syntesised from a methanolic solution, whereas two dinuclear ([MoO2(L1,2)]2 and one
polynuclear [MoO2(L1)]n complexes have been synthesized from acetonitrilic ones. All
complexes were identified by the infrared spectroscopy, nuclear magnethic resonance,
thermogravimetric and element analysis. Molecular and crystal structures of both of the
hydrazone ligands (H2L1, H2L2) and of dinuclear dioxomolybdenum(VI) complex
([MoO2(L1)]2×MeCN) were determined by the single crystal X-ray diffraction. Catalytic activity
of dinuclear and polynuclear complexes was tested in the microwave assisted solvent-free
(ep)oxidation of cyclohexene with different oxidants (aqueous tert-butyl hydroperoxide, tertbutyl
hydroperoxide in decane and hydrogen peroxide solution).

• Keywords: cikloheksen; hidrazoni; epoksidacija; mikrovalno zračenje; kompleksi molibdena(VI)
• Keywords (english): cyclohexene; solvent-free (ep)oxidation; hydrazones; microwave-assisted; molybdenum(VI)
• Language: croatian
• URN:NBN: urn:nbn:hr:217:951651
• 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: Open access; Embargo expiration date: 2021-11-15
• Created on: 2019-12-10 12:37:40