Transition metal complexes with thiosemicarbazide-based ligands. Part L. Synthesis, physicochemical properties and crystal structures of Co(II) complexes with acetone S-methylisothiosemicarbazone
Apstrakt
In this paper, we report the synthesis of three novel Co(II) complexes with acetone S-methylisothiosemicarbazone (L), (CH3)(2)C-2 = N-1-(NH)-H-2-C-1(SCH3)=(NH)-H-3. The complexes are characterized by IR spectroscopy and magnetic measurements while in the case of [CoL2Cl]I (1) and [CoLBr2] (2) the crystal structures have been determined by X-ray diffractometry. In both complexes the bidentate L ligand is coordinated in its imido form. In contrast to the other isothiosemicarbazide-based ligands, the molecule of L contains a localized double bond between the carbonyl and isothiosemicarbazide moieties (C-2 = N-1). The coordination polyhedron of I is best described as a distorted trigonal bipyramid. In the aim of a structural comparison, the analysis of similar five-coordinate bis(bidentate)-Co(II) and bis(bidentate)-Co(III) complexes containing two five-membered chelates has been carried out. The results suggest that if there is no steric hindrance between the ligands in the basal plane th...ese complexes prefer a square-pyramidal geometry. The trigonal bipyramidal geometry of I is attributed to the steric interaction of L molecules caused by their favorable planarity. In complex 2 Co(II) exhibits a distorted tetrahedral geometry. The deformation of the coordination polyhedron is mainly attributed to the small bite angle of L. The similar position of the IR absorption bands in the spectra of 1 and 3 suggest their similar structural features. The values of the effective magnetic moments (mu(eff)) per cobalt (II) for the three complexes are slightly higher than the values expected for the spin-only S = 3/2 systems. (c) 2005 Elsevier Ltd. All rights reserved.
Ključne reči:
cobalt complexes / isothiosemicarbazide / X-ray analysis / penta-coordination / five-membered chelate ringsIzvor:
Polyhedron, 2006, 25, 5, 1096-1104
DOI: 10.1016/j.poly.2005.08.051
ISSN: 0277-5387
WoS: 000236392900003
Scopus: 2-s2.0-33644656749
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Novaković, Slađana B. AU - Bogdanović, Goran A. AU - Leovac, Vukadin M. PY - 2006 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3000 AB - In this paper, we report the synthesis of three novel Co(II) complexes with acetone S-methylisothiosemicarbazone (L), (CH3)(2)C-2 = N-1-(NH)-H-2-C-1(SCH3)=(NH)-H-3. The complexes are characterized by IR spectroscopy and magnetic measurements while in the case of [CoL2Cl]I (1) and [CoLBr2] (2) the crystal structures have been determined by X-ray diffractometry. In both complexes the bidentate L ligand is coordinated in its imido form. In contrast to the other isothiosemicarbazide-based ligands, the molecule of L contains a localized double bond between the carbonyl and isothiosemicarbazide moieties (C-2 = N-1). The coordination polyhedron of I is best described as a distorted trigonal bipyramid. In the aim of a structural comparison, the analysis of similar five-coordinate bis(bidentate)-Co(II) and bis(bidentate)-Co(III) complexes containing two five-membered chelates has been carried out. The results suggest that if there is no steric hindrance between the ligands in the basal plane these complexes prefer a square-pyramidal geometry. The trigonal bipyramidal geometry of I is attributed to the steric interaction of L molecules caused by their favorable planarity. In complex 2 Co(II) exhibits a distorted tetrahedral geometry. The deformation of the coordination polyhedron is mainly attributed to the small bite angle of L. The similar position of the IR absorption bands in the spectra of 1 and 3 suggest their similar structural features. The values of the effective magnetic moments (mu(eff)) per cobalt (II) for the three complexes are slightly higher than the values expected for the spin-only S = 3/2 systems. (c) 2005 Elsevier Ltd. All rights reserved. T2 - Polyhedron T1 - Transition metal complexes with thiosemicarbazide-based ligands. Part L. Synthesis, physicochemical properties and crystal structures of Co(II) complexes with acetone S-methylisothiosemicarbazone VL - 25 IS - 5 SP - 1096 EP - 1104 DO - 10.1016/j.poly.2005.08.051 ER -
@article{ author = "Novaković, Slađana B. and Bogdanović, Goran A. and Leovac, Vukadin M.", year = "2006", abstract = "In this paper, we report the synthesis of three novel Co(II) complexes with acetone S-methylisothiosemicarbazone (L), (CH3)(2)C-2 = N-1-(NH)-H-2-C-1(SCH3)=(NH)-H-3. The complexes are characterized by IR spectroscopy and magnetic measurements while in the case of [CoL2Cl]I (1) and [CoLBr2] (2) the crystal structures have been determined by X-ray diffractometry. In both complexes the bidentate L ligand is coordinated in its imido form. In contrast to the other isothiosemicarbazide-based ligands, the molecule of L contains a localized double bond between the carbonyl and isothiosemicarbazide moieties (C-2 = N-1). The coordination polyhedron of I is best described as a distorted trigonal bipyramid. In the aim of a structural comparison, the analysis of similar five-coordinate bis(bidentate)-Co(II) and bis(bidentate)-Co(III) complexes containing two five-membered chelates has been carried out. The results suggest that if there is no steric hindrance between the ligands in the basal plane these complexes prefer a square-pyramidal geometry. The trigonal bipyramidal geometry of I is attributed to the steric interaction of L molecules caused by their favorable planarity. In complex 2 Co(II) exhibits a distorted tetrahedral geometry. The deformation of the coordination polyhedron is mainly attributed to the small bite angle of L. The similar position of the IR absorption bands in the spectra of 1 and 3 suggest their similar structural features. The values of the effective magnetic moments (mu(eff)) per cobalt (II) for the three complexes are slightly higher than the values expected for the spin-only S = 3/2 systems. (c) 2005 Elsevier Ltd. All rights reserved.", journal = "Polyhedron", title = "Transition metal complexes with thiosemicarbazide-based ligands. Part L. Synthesis, physicochemical properties and crystal structures of Co(II) complexes with acetone S-methylisothiosemicarbazone", volume = "25", number = "5", pages = "1096-1104", doi = "10.1016/j.poly.2005.08.051" }
Novaković, S. B., Bogdanović, G. A.,& Leovac, V. M.. (2006). Transition metal complexes with thiosemicarbazide-based ligands. Part L. Synthesis, physicochemical properties and crystal structures of Co(II) complexes with acetone S-methylisothiosemicarbazone. in Polyhedron, 25(5), 1096-1104. https://doi.org/10.1016/j.poly.2005.08.051
Novaković SB, Bogdanović GA, Leovac VM. Transition metal complexes with thiosemicarbazide-based ligands. Part L. Synthesis, physicochemical properties and crystal structures of Co(II) complexes with acetone S-methylisothiosemicarbazone. in Polyhedron. 2006;25(5):1096-1104. doi:10.1016/j.poly.2005.08.051 .
Novaković, Slađana B., Bogdanović, Goran A., Leovac, Vukadin M., "Transition metal complexes with thiosemicarbazide-based ligands. Part L. Synthesis, physicochemical properties and crystal structures of Co(II) complexes with acetone S-methylisothiosemicarbazone" in Polyhedron, 25, no. 5 (2006):1096-1104, https://doi.org/10.1016/j.poly.2005.08.051 . .