Six Flexible and Rigid Co(II) Coordination Networks with Dicarboxylate and Nicotinamide-Like Ligands: Impact of Noncovalent Interactions in Retention of Dimethylformamide Solvent
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CHIŞCA, Diana, CROITOR, Lilia, KOROPCHANU, E., PETUHOV, Oleg, VOLODINA, Galina, BACA, Svetlana, KRAMER, Karl W, HAUSER, J, DECURTINS, Silvio, LIU, Shi-Xia, FONARI, Marina. Six Flexible and Rigid Co(II) Coordination Networks with Dicarboxylate and Nicotinamide-Like Ligands: Impact of Noncovalent Interactions in Retention of Dimethylformamide Solvent. In: Crystal Growth and Design, 2016, nr. 12(16), pp. 1011-1024. ISSN 1528-7483. DOI: https://doi.org/10.1021/acs.cgd.6b01226
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Crystal Growth and Design
Numărul 12(16) / 2016 / ISSN 1528-7483

Six Flexible and Rigid Co(II) Coordination Networks with Dicarboxylate and Nicotinamide-Like Ligands: Impact of Noncovalent Interactions in Retention of Dimethylformamide Solvent
DOI: https://doi.org/10.1021/acs.cgd.6b01226

Pag. 1011-1024

Chişca Diana1, Croitor Lilia1, Koropchanu E.23, Petuhov Oleg2, Volodina Galina1, Baca Svetlana1, Kramer Karl W4, Hauser J4, Decurtins Silvio4, Liu Shi-Xia4, Fonari Marina1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 Institute of Chemistry of the Academy of Sciences of Moldova,
3 Tiraspol State University,
4 University of Bern
 
Disponibil în IBN: 20 octombrie 2017


Rezumat

Six mixed-ligand Co(II) coordination polymers, {[Co(adi)(iso-nia)2]·dmf}n (1), [Co(adi)(iso-nia)2]n (2), {[Co2(suc)(ac)2(iso-nia)4][Co2(suc)(sucH)2(iso-nia)4]·2dmf}n (3), [Co(adi)(nia)2]n (4), {[Co(bdc)(nia)2]·dmf}n (5), and {[Co(mal)(S-nia)(H2O)]·dmf}n (6), were synthesized and characterized by single crystal X-ray analysis. They are based on four dicarboxylic acids, namely, malonic (H2mal), succinic (H2suc), adipic (H2adi), and 1,4-benzenedicarboxylic (H2bdc) acids, as well as three nicotinamide-like ligands, isonicotinamide (iso-nia), nicotinamide (nia) and thionicotinamide (S-nia). Compounds 1, 2, and 3 represent one-dimensional coordination polymers, whereas 4, 5, and 6 exhibit two-dimensional structures. The coordination arrays in 1-5 are built from the similar [Co2(COO)2] binuclear clusters, while framework 6 is based on mononuclear metal nodes. All crystal lattices are supported by hydrogen bonding with nicotinamide-like ligands acting as pillars or dangling terminal ligands. Four crystal lattices 1, 3, 5, and 6 host dmf solvent via NH···O hydrogen bonding and π- π stacking interactions with the coordination networks. Details of the reversible dmf release-uptake by 1 and 2, and contribution of hydrogen bonding in stabilization of the solvent-free structures 2 and 4 are discussed. All new solids were characterized by IR spectroscopy and thermogravimetric analysis, while magnetic measurements are reported for compounds 1, 5, and 6. The magnetic data show the typical behavior of Co(II) ions originating from pronounced zero-field splitting within the ground state with contributing effects from weak antiferromagnetic exchange interactions.

Cuvinte-cheie
Amides, carbon dioxide, Carboxylation, Cobalt compounds, Crystal, Magnetic field effects, solvents,

latticesDangling bonds, Ground stateHydrogen bonds, IonsLigands, PolymersSingle crystals, Thermogravimetric analysisX ray analysis

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