Crystal structure of 2-hydroxy-3-carboxy-1-naphthaldehyde semicarbazone copper(II) complex
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LAZARESKU, Ana, LOZAN, Vasile, MELNIK, E., KRAVTSOV, Victor. Crystal structure of 2-hydroxy-3-carboxy-1-naphthaldehyde semicarbazone copper(II) complex. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 121. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Crystal structure of 2-hydroxy-3-carboxy-1-naphthaldehyde semicarbazone copper(II) complex


Pag. 121-121

Lazaresku Ana1, Lozan Vasile1, Melnik E.2, Kravtsov Victor2
 
1 Institute of Chemistry,
2 Institute of Applied Physics
 
Disponibil în IBN: 5 noiembrie 2019


Rezumat

Semi- and thiosemicarbazones, their derivatives and metal complexes attract attention for a long time due to significant bioactivities and wide pharmacological versatility [1-3]. In continuation of our study on semi- and thiosemicarbazone compounds of 3d metals, a new copper(II) complex with new Schiff base (H3L) obtained by interaction of 2-hydroxy-3-carboxy1-naphthaldehyde and N(4)-phenyl-semicarbazide moiety has been synthesized and characterized by single crystal X-ray method. The crystals of complex with composition [Cu(H2L)Br]*0.5H2O*0.5dmso crystallize in the non-centrosymmetric monoclinic space group P21 with unit cell parameters: a = 8.1743(5), b = 28.735(2), c = 8.7870(4) Å, b = 102.643(5)°, V = 2013.9(2) Å3. The asymmetric unit comprises two similar square-planar Cu(II) complexes with ONOBr coordination surrounding provided by threedentate organic ligand (Cu-O distances are in the range 1.865(8)-1.935(8) Å and Cu-N 1.930(8)-1.962(8) Å), and Br- anion (Cu-Br distances are 2.334(2) and 2.339(2) Å), (Figure). The orientation of carboxylic group is stabilized by an intramolecular O–H***O hydrogen bond 2.49(1) Å. The ligands in symmetry independent complexes differ by mutual arrangement of five-membered metalocycle and phenyl moiety of semicarbazone fragment. The corresponding dihedral angles are equal to 41.4 and 9.3°. In the crystal complexes are linked in chains by N–H***Ohydrogen bonds with N2***O7 and N5***O4 distances 2.74(1) and 2.75(1) Å, respectively (Figure).figureThe crystal structure reveals infinite columns of complexes due to stacking interactions between their planar metallocycles and naphthalene moieties with average interplanar distance 3.4Å.