Naslov
Impact of metal coordination on amide synthons in isonicotinamide complexes

Autori
Popović, Zora ; Đaković, Marijana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
21st Conference of the Serbian Crystallographic Society, Abstracts / Dejan Poleti, Aleksandra Dapčević - Beograd : Serbian Crystallographic Society, 2014, 62-63

ISBN
978-86-912959-1-2

Skup
21st Conference of the Serbian Crystallographic Society

Mjesto i datum
Užice, Srbija, 11.06.2014. - 14.06.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Supramolecular structures; amide synthons; Co(II); Ni(II); complexes; X-ray

Sažetak
The design of supramolecular architectures by self-assembly of small building blocks has become a major research area owing to its potential for practical applications [1]. Although in crystal engineering the metal–ligand bond plays a determining role, dictating the resultant supramolecular topology of the metal–organic frameworks (MOFs), the secondary interactions, such as hydrogen bonding, π–π interactions, etc. also have a significant influence in shaping the final architecture. The self-assembly of coordination frameworks is also highly affected by various other parameters such as the dynamic nature of the metal–ligand bonds, structural preferences of the metal ions, nature of ligating topologies of the ligand, metal–ligand ratio, nature of counter ions and various experimental conditions (solvents, pH, temperature, crystallization methods). Therefore, it is still difficult to predict the final outcome and much work has to be done to improve our understanding of all the factors influencing the final supramolecular architecture. Pyridinecarboxamide ligands have been used as effective tools to organize metal building blocks into extended assemblies by combining their metal coordinating ability, robust hydrogen-bonding ability and π–π stacking between aromatic rings [2]. Employing the mentioned strategy we synthesized and structurally determined the following complexes: [Co(isn)2(NCS)2(H2O)2]2H2O (1), [Ni(isn)2(NCS)2(H2O)2]2H2O (2) [Co(isn)3(NCS)2(H2O)]2.5H2O (3), where isn = isonicotinamide. In all three structures there is a lack of self-complementary amide-amide dimeric R24(8) or catemeric C(4). Instead, R46(12) hexamers are found in 1 and 2, and R24(8) tetramers in 3, and an additional very complicated hydrogen bonding 3D-framework is resulted, due to participation of crystal water molecules. Crystal packing of 1 and 2 viewed down Crystal packing of 3 viewed down the a axis the b axis [1] B.H. Northorp et al., Acc. Chem. Res., 42 (2009) 1554. [2] M. Đaković et al., CrystEngComm, 13 (2011) 5863.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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