Kristalni koordinacijski polimeri kadmijevih(II) halogenida s cijanopiridinskim ligandima - supramolekulsko povezivanje i mehanički odziv

master's thesis

• Title (english): Crystal coordination polymers of cadmium(II) halogenides with cyanopyridine ligands - supramolecular conectivity and mechanical response
• Author: Amanda Posavec
• Mentor: Marijana Đaković (mentor)
• Committee member: Marijana Đaković (predsjednik povjerenstva)
• Committee member: Vesna Petrović Peroković (član povjerenstva)
• Committee member: Sanda Rončević (član povjerenstva)
• Committee member: Željka Soldin (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2019-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U okviru ovog rada sintetizirani su koordinacijski polimeri kadmijevih(II) halogenida s nitrilnim
derivatima piridina kao ligandima. Priređeno je 6 kompleksnih spojeva ([CdCl2(3-CNpy)2]n (A1),
[CdBr2(3-CNpy)2]n (A2), [CdI2(3-CNpy)2]n (A3), [CdCl2(4-CNpy)2]n (B1), [CdBr2(4-CNpy)2]n (B2) i
[CdI2(4-CNpy)2]n (B3)) klasičnom otopinskom sintezom. Priređeni spojevi analizirani su infracrvenom
spektroskopijom, metodama termičke analize te difrakcijom rendgenskog zračenja u praškastom
uzorku, te im je određena molekulska i kristalna struktura rendgenskom strukturnom analizom
metodom difrakcije rendgenskog zračenja u monokristalnom uzorku. U kristalnom pakiranju
ustanovljena je važnost supramolekulskih interakcija, prvenstveno vodikovih veza ali i dipol-dipol
interakcija, kod povezivanja polimernih lanaca u kristalnu strukturu. Također, ispitan je odziv
igličastih kristala na primjenu vanjske mehaničke sile čime je ustanovljen njihov elastičan odziv u
slučaju spojeva A1, A2 i B1 te plastičan u slučaju B2, dok su se kristali spojeva A3 i B3 pokazali
nefleksibilnima. Opaženi mehanički odzivi korelirani su s jakosti i usmjerenosti ostvarenih
supramolekulskih interakcija u kristalnom pakiranju priređenih spojeva.

Abstract (english)

This diploma thesis presents synthesis of coordination polymers of cadmium(II) halides with
3-cyanopiridine and 4-cyanopiridine. Six compounds ([CdCl2(3-CNpy)2]n (A1), [CdBr2(3-CNpy)2]n
(A2), [CdI2(3-CNpy)2]n (A3), [CdCl2(4-CNpy)2]n (B1), [CdBr2(4-CNpy)2]n (B2) and [CdI2(4-CNpy)2]n)
(B3) were prepared by classical solution synthesis. The products were characterized by infrared
spectroscopy, thermal methods and powder X-ray diffraction, while molecular and crystal structure
were determined by single crystal X-ray diffraction analysis. The importance of supramolecular
interactions (particularly hydrogen bonds and dipole-dipole interactions) in linking polymeric
building units into the supramolecular architecture is established. Also, the response of needle-like
crystals to the application of external mechanical force was investigated, and elastic (A1, A2, B1) and
plastic (B2) flexibility was established. Furthermore, crystals of two compounds (A3 and B3) showed
to be stiff and brittle. The observed mechanical responses were correlated with the strength and
geometry of supramolecular interactions in the crystal packings of prepared products.

• Keywords: 3-cijanopiridin; 4-cijanopiridin; fleksibilni kristali; kadmij(II); koordinacijski polimeri
• Keywords (english): cadmium(II); coordination polymers; 3-cyanopyridine; 4-cyanopyridine; flexible crystals
• Language: croatian
• URN:NBN: urn:nbn:hr:217:767846
• 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: 2021-09-27
• Created on: 2019-10-11 10:23:04