Naslov
Self-assembly of two isomorphous thiocyanate complexes of Co(II) and Ni(II) with 3-hydroxypicolinamide

Autori
Đaković, Marijana ; Došen, Maja ; Popović, Zora

Izvornik
Journal of chemical crystallography (1074-1542) 41 (2011), 2; 180-185

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

Ključne riječi
cobalt(II); nickel(II); 3-hydroxypicolinamide; crystal structure; hydrogen bonding

Sažetak
The synthesis, thermal and spectral characterization, and crystal structure of isomorphous thiocyanate cobalt(II) and nickel(II) complexes with 3-hydroxypicolinamide (3-OHpia), [M(C6H6N2O2)2(NCS)2]•2H2O, are reported. The metal(II) ions are chelated by two cis-oriented 3-OHpia and two thiocyanate ligands in distorted octahedral geometry. The distortion within the coordination sphere is mainly imposed by formation of the chelate rings. The compounds crystallize in monoclinic space group P2/c with two symmetrically independent molecules and a = 14.4945(2) Å, b = 8.5906(1) Å, c = 16.3865(3) Å, beta = 105.987(2)°, Z = 4 (1) and a = 14.4927(5) Å, b = 8.5912(3) Å, c = 16.2712(6) Å, beta = 105.740(4)°, Z = 4 (2). Commonly observed supramolecular amide synthons are not robust enough to accommodate thiocyanate ions and H2O molecules. But instead, neutral complexes are linked through hydrogen bonds leading to two different hydrogen bonding ribbon motifs involving amide moieties and H2O molecules [C(8)R22(12) along c axis] and amide moieties and thiocyanate ions [C(8)R22(16) along b axis] for symmetrically related molecules labelled as 1 [Co1 (1) and Ni1 (2)] and 2 [Co2 (1) and Ni2 (2)], respectively.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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