Slojeviti hibridni organsko-anorganski halogenokuprati(II) i halogenomanganati(II) – od strukturnih karakteristika do termičkih, magnetskih i električnih svojstava

doctoral thesis

• Title (english): Layered hybrid organic-inorganic halocuprates(II) and halomanganates(II) – from structural features to thermal, magnetic and electric properties
• Author: Edi Topić
• Mentor: Mirta Rubčić (mentor)
• Committee member: Biserka Prugovečki (predsjednik povjerenstva)
• Committee member: Ivan Halasz (član povjerenstva)
• Committee member: Damjan Pelc (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2023-04-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry
• Universal decimal classification (UDC): 54 - Chemistry. Crystallography. Mineralogy

Abstract

U okviru ovog rada pripravljene su i u čvrstom stanju istražene tetraklorokupratne(II),
tetrabromokupratne(II) i tetrakloromanganatne(II) soli izvedene iz monoamina, diamina i
triamina različitih geometrijskih karakteristika i kemijskih funkcionalnosti. Poseban naglasak
pri istraživnju posvećen je strukturnim karakteristikama priređenih spojeva, njihovim
termičkim svojstvima, te odabranim magnetskim i električnim svojstvima. Iz difrakcijske
strukturne analize priređenih spojeva, te simetrijske i statističke analize literaturno opisanih
primjera, postavljena su geometrijska ograničenja i očekivanja za ovaj tip spojeva, koja su
omogućila predlaganje smislenih strukturnih modela iz podataka difrakcije na prahu.
Predložena je prava simetrija feroelektrične faze etilamonijevog tetraklorokuprata(II) iz
podataka neutronske difrakcije, određene su strukture triju aperiodičnih kristala. Izučene su
promjene u strukturi metilamonijevih halogenokuprata(II) uslijed supstitucijskog miješanja na
položaju halogenidnog iona. Analizirana su magnetska svojstva slojevitih hibrida u ovisnosti o
odabranim gradivnim ionima i dimenzionalnosti anorganske okosnice, te su kvantificirane
modulacije u magnetskim svojstvima u supstitucijski miješanim kristalima.

Abstract (english)

In this work, tetrachlorocuprate(II), tetrabromocuprate(II) and tetrachloromanganate(II) salts
derived from monoamines, diamines and triamines with different geometric characteristics and
chemical functionalities were prepared and investigated in the solid state. An emphasis was
given to the structural characteristics, thermal properties, and selected magnetic and electrical
properties of prepared compounds. Geometric limitations and expectations were derived for
this type of materials from the diffraction structural analysis of prepared compounds, and the
symmetry and statistical analysis of those described in the literature, which enabled the proposal
of meaningful structural models from powder diffraction data. The true symmetry of the
ferroelectric phase of ethylammonium tetrachlorocuprate was proposed from neutron
diffraction data. Structures of three aperiodic crystals were determined. Changes in the structure
of methylammonium tetrahalocuprates(II) due to substitutional mixing of halide ions were
quantified. The magnetic properties of the layered hybrids were analyzed in relation to the
selection of building ions and the dimensionality of the inorganic framework. Modulations of
the magnetic properties in substitutionally mixed crystals were quantified.

• Keywords: slojeviti materijali; strukturna analiza; termička svojstva; magnetizam; električna svojstva
• Keywords (english): layered materials; structural analysis; thermal properties; magnetism; electric properties
• Language: croatian
• URN:NBN: urn:nbn:hr:217:519214
• Promotion: 2023
• Study programme: Title: Doctoral study in chemistry; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija (doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija)
• Type of resource: Text
• Extent: LXXXIII, 121 str ; 30 cm
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-04-17
• Created on: 2023-04-27 13:40:03