Priprava, strukturna i električna karakterizacija kompleksnih spojeva molibdena i bakra sa Schiffovim bazama

master's thesis

• Title (english): Preparation, structural and electrical characterization of molybdenum and copper complex with Schiff bases
• Author: Martina Stojić
• Mentor: Jana Pisk (mentor)
• Mentor: Luka Pavić (mentor)
• Committee member: Jana Pisk (predsjednik povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Committee member: Đani Škalamera (član povjerenstva)
• Committee member: Mirta Rubčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2021-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U sklopu ovog diplomskog rada pripravljena su dva hidrazonska liganda: (E)-2-hidroksi-N‘-(2-hidroksi)-5-nitrobenziliden (H2L1) i (E)-4-hidroksi-N‘-(2-hidroksi)-5-nitrobenziliden (H2L2) iz 2-hidroksibenzhidrazida ili 4-hidroksibenzhidrazida te 2-hidroksi-5-nitrobenzaldehida u metanolu. Karakterizirani su razlikovnom pretražnom kalorimetrijom (DSC) i infracrvenom spektroskopijom (IR). Nakon toga su pripravljeni kompleksi liganada s [MoO2(acac)2] i [Cu(OAc)2]∙H2O u MeOH i MeCN. U reakciji sa MeOH nastaju mononuklerani kompleksi Mo(VI): [MoO2(L1)(MeOH)], [MoO2(L2)(MeOH)], dok u MeCN nastaju polinuklearni [MoO2(L1)]n i dinuklearni kompleks [MoO2(L2)]2∙2H2O. Suprotno tomu, reakcijom [Cu(OAc)2]∙H2O s H2L1, u MeOH ili MeCN, nastaje dinuklearni kompleks [Cu2(L1)2], dok s H2L2 u MeOH nastaje [Cu2(L2)2]∙3MeOH. Svi kompleksni spojevi su analizirani s IR, i termogravimetrijskom analizom (TG), te elementnom analizom (EA). Molekulska i kristalna struktura [MoO2(L1)]n određena je difrakcijom rendgenskog zračenja na jediničnom kristalu. Pomoću metode impedancijske spektroskopije (IS) je praćena in situ moguća polimerizacija kompleksa te su istraživana električna/dielektrična svojstva u širokom temperaturnom i frekvencijskom području.

Abstract (english)

As a part of this diploma thesis, two hydrazone ligands, (E)-2-hydroxy-N'(2-hydroxy)-5-nitrobenzylidene)benzohydrazide (H2L1) and (E)-4-hydroxy-N'-(2-hydroxy)-5-nitrobenzylidene)benzohydrazide (H2L2) were prepared from 2-hydroxybenzhydrazide or 4-hydroxybenzhydrazide and 2-hydroxy-5-nitrobenzaldehyde, in methanol. They were characterized by differential scanning calorymetry (DSC) and infrared spectroscopy (IR). After that complexes with the ligands were prepared with [MoO2(acac)2] and [Cu(OAc)2] H2O in MeOH and MeCN. In reaction with the MeOH mononuclear Mo(VI) complexes, [MoO2(L1)(MeOH)], [MoO2(L2)(MeOH)] were obtained, while the reaction in MeCN gave [MoO2(L1)]n and [MoO2(L2)]2∙2H2O. On the contrary, H2L1 with [Cu(OAc)2] H2O in the MeOH or MeCN gave the dinuclear complex [Cu2(L1)2] , while H2L2 in combination with [Cu(OAc)2] H2O in MeOH gave [Cu2(L2)2]∙3MeOH. All complexes were analyzed by IR, termogravimetric analysis (TG) and elemental analysis (EA). Molecular and crystal structure of [MoO2(L1)]n was determined by x-ray diffraction on the monocrystal. Using impedance spectroscopy method (IS) posibility of polymerization of complexes was followed in-situ and their electrical/dielectric properties were examined in wide temperature and frequency range.

• Keywords: električna provodnost; dielektrična permitivnost kompleksni spojevi molibdena(VI) i bakra(II)
• Keywords (english): electrical conductivity; dielectric permitivity; complex compounds of molybdenum(VI) and copper(II)
• Language: croatian
• URN:NBN: urn:nbn:hr:217:454982
• 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: 2023-09-23
• Created on: 2021-09-30 11:10:51