Polymeric Co(II) dicarboxylates with nicotinamide-like pillars: crystal structures, dmf adsorption and magnetic properties
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CHIŞCA, Diana; CROITOR, Lilia; COROPCEANU, Eduard; PETUHOV, Oleg; VOLODINA, Galina; BACA, Svetlana; KRAMER, Karl W; LIU, Shixia; HAUSER, J; DECURTINS, Silvio; FONARI, Marina. Polymeric Co(II) dicarboxylates with nicotinamide-like pillars: crystal structures, dmf adsorption and magnetic properties. In: Materials Science and Condensed Matter Physics. Editia a 8-a, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, pp. 139-140. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia a 8-a, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Polymeric Co(II) dicarboxylates with nicotinamide-like pillars: crystal structures, dmf adsorption and magnetic properties


Pag. 139-140

Chişca Diana1, Croitor Lilia1, Coropceanu Eduard2, Petuhov Oleg2, Volodina Galina1, Baca Svetlana1, Kramer Karl W3, Liu Shixia3, Hauser J3, Decurtins Silvio3, Fonari Marina1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 Institute of Chemistry of the Academy of Sciences of Moldova,
3 University of Bern
 
Disponibil în IBN: 29 iulie 2019


Rezumat

The Co(II) coordination networks are interesting through their remarkable adsorptive, catalytic and magnetic properties, and by their unique solvatochromic and vaporchromic behavior that makes these materials attractive targets as the sensing tools. The great variety of the reported Co(II) based coordination polymers represent the mixed-ligand systems as well as the systems with the ditopic ligands that combine both carboxylic and pyridine functions in one molecule such as nicotinic acid and its derivatives. Herein, we report the syntheses and single-crystal structures for six coordination polymers, 1D arrays {[Co(adi)(iso-nia)2].(dmf)}n, (1), [Co(adi)(iso-nia)2]n, (2), {[Co2(suc)(ac)2(isonia)4][Co2(suc)(sucH)2(iso-nia)4].(dmf)2]}n (3), and 2D sheets [Co(adi)(nia)2]n, (4) {[Co(bdc)(nia)2].dmf}n (5), and {[Co(mal)(S-nia)(H2O)]·dmf}n (6), where adi=adipate, mal=malonate, suc=succinate, bdc=1,4-benzenedicarboxylate, ac=acetate anions, nia=nicotinamide, iso-nia=isonicotinamide, S-nia=thionicotinamide. The coordination arrays in 1-5 are built from the similar {Co2(COO)2} binuclear clusters, while the 2D network 6 with the S-nia ligand is built on the single-metal building block. All the crystal lattices are supported by hydrogen bonding with nicotinamide-like ligands acting as pillar or dangling terminal ligands. Four crystal lattices 1, 3, 5, and 6 host the dmf solvent via the NH…O hydrogen bonding and π-π stacking interactions with the coordination networks. Compound 2 is a solvent-free apohost obtained from 1 by the single-crystalto-single-crystal (SC-SC) transformation of 1. The crystal 2 withstands its morphology, crystal system and 1D coordination array. The soaking of 2 in dmf reveals the reversible transformation in this system since 2 came back to the unit cell parameters fixed for 1 that was confirmed unambiguously by the X-ray studies. The conclusion is following that even the 1D coordination polymer sustained by several rather strong H-bonds demonstrates to maintain its structural integrity towards the removal/adhesion of the solvent, in this particular case being the dmf molecules. The magnetic properties for compounds 1, 5 and 6 have been investigated and will be discussed.  Acknowledgments. Authors thank SCOPES IZ73Z0_152404/1 for financial support. Authors from Moldova thank Project CSSDT 15.817.02.06F for support.