Pregled bibliografske jedinice broj: 1171879
Investigating the Impact of Supramolecular Connectivity on Mechanical Properties of Crystals
Investigating the Impact of Supramolecular Connectivity on Mechanical Properties of Crystals // IV. Simpozij supramolekulske kemije - knjiga sažetaka
Zagreb, Hrvatska, 2021. str. tba-tba (pozvano predavanje, domaća recenzija, sažetak, znanstveni)
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Naslov
Investigating the Impact of Supramolecular
Connectivity on Mechanical Properties of Crystals
Autori
Borovina, Mladen ; Pisačić, Mateja ; Husinec, Ana ; Badurina, Valentina ; Đaković, Marijana
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
IV. Simpozij supramolekulske kemije - knjiga sažetaka
/ - , 2021, Tba-tba
Skup
IV. simpozij supramolekulske kemije (Supramolecular Chemistry 2021)
Mjesto i datum
Zagreb, Hrvatska, 10.12.2021
Vrsta sudjelovanja
Pozvano predavanje
Vrsta recenzije
Domaća recenzija
Ključne riječi
crystals ; cadmium ; copper ; coordination polymers ; mechanical bendability
Sažetak
Recent findings in the field of crystal engineering of molecular crystals have shifted the paradigm that crystals are brittle, rigid, and easily break when mechanical force is applied to them. There is a growing number of scientific papers which show that molecular crystals can also exhibit plastic and/or elastic deformation as a response to applied mechanical force. While these new phenomena are certainly interesting the mechanisms that lead to these extraordinary behaviors are not completely understood and require additional research. Our previous research has found that cadmium(II) halide coordination polymers with halogen substituted pyrazine ligands can exhibit bending deformation and revert to their original state as long they are not bent beyond a certain threshold (i.e. the critical radius).1 It was also shown that halogen bons formed between halide and halogen atoms could indeed play a crucial role in defining the mechanical properties of these crystals. Halogen substituted pyrazines are considered relatively weak halogen bond donors and the interactions that they form are comparable to weak hydrogen bonds.2 Therefore replacing weak halogen bond donors with weak hydrogen bond donors could in theory produce similar mechanical responses in crystals. To investigate this venue, we opted to use nitropyridine ligands since they also have a conformationally rigid structure as well as nitro groups which can serve both as a potential hydrogen bond acceptor and due to their electron withdrawing nature have an activating effect on present C–H hydrogen bond donors. We also expanded our research to copper(II) halides (chloride and bromide) to investigate if findings for cadmium(II) halide compounds could be applied to different metal halides which possess similar structural features (i.e. form 1D coordination polymers). All four possible coordination polymers were successfully crystalized and gave needle like crystals which were of adequate quality for mechanical property measurements. Their crystal structures were also successfully determined and correlated with observed mechanical responses.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
POVEZANOST RADA
Projekti:
--IP-2019-04-1242 - Od oblika do funkcije: Fleksibilni kristalni materijali s kontroliranim mehaničkim odzivom (FlexibleCrystals) (Đaković, Marijana) ( CroRIS)
Ustanove:
Prirodoslovno-matematički fakultet, Zagreb