Naslov
Synthesis, spectroscopic and structural investigation of two nickel(II) thiocyanate complexes with isonicotinic acid

Autori
Đaković, Marijana ; Popović, Zora ; Smrečki-Lolić, Neven

Izvornik
Journal of molecular structure (0022-2860) 888 (2008), 1/3; 394-400

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nickel(II) thiocyanate complex; isonicotinic acid; co-crystals; X-ray crystal structure; IR-spectra; TGA/DTA analysis

Sažetak
Two co-crystals trans-[Ni(NCS)2(H2O)2(isonicH)2] with isonicotinic acid and water molecules (isonicH = isonicotinic acid i.e. pyridine-4-carboxylic acid) were obtained by reaction of Ni(NO3)2.6H2O, isonicH and KSCN in 1:2:2 molar ratio in aqueous media. One co-crystal [Ni(NCS)2(H2O)2(isonicH)2]2.4(isonicH).3H2O (2), is obtained from reaction which has been performed at room temperature while the other one, [Ni(NCS)2(H2O)2(isonicH)2].(isonicH).2H2O (1), was obtained by refluxing the reaction mixture for a few hours. The complexes are characterized by IR-spectroscopy and thermal and X-ray crystallographic methods. The vompounds crystallize in monoclinic C2/c (1) and P21/c (2) space groups and in both complexes N4O2 nearly-perfect octahedron around nickel is established. In both compounds molecules are linked into three-dimensional framework by O-H...O, N-H...O and O-H...S hydrogen bonds. The co-crystallized isonicotinic acid molecules are mutually linked forming C21(7)[R21(4)] (1) and in C(7) (2) hydrogen-bond motifs along b axis. The IR and thermal data correlate with the structures of the complexes in the solid state.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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