Cobalt(III) complexes with 2-acetyl- and 2-formylpyridine 4N-methylthiosemicarbazones

Castiñeiras, A.; West, Douglas X.; Gebremedhin, Haileselassie; Romack, Timothy J.

doi:10.1016/0020-1693(93)03706-g

Cited by 49 publications

(10 citation statements)

References 22 publications

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“…Deprotonation of the ligand accompanied by tautomerisation generates the iminothiolate form and the negative charge so formed is delocalized in the C-N-N-C system, as is reflected by their intermediate bond distances (Table 2). These values compare well with those of other six-coordinate Co(III) complexes of related NNS donor ligands [25]. The C-S bond distances [ca.…”

Section: Description Of Crystal Structuressupporting

confidence: 80%

“…The broad band is due to the S→Co(III) charge transfer transition, as is also evident from the solution spectral study. The other two bands may be assigned as 1 A 1g → 1 T 1g and 1 A 1g → 3 T 2g transitions, respectively [25]. In methanolic solution, it displays S→Co(III) charge transfer transition (LMCT) at 413 nm (ε, 27,653 L mol −1 cm −1 ) without any d-d bands.…”

Section: Description Of Crystal Structuresmentioning

confidence: 99%

“…In methanolic solution, it displays S→Co(III) charge transfer transition (LMCT) at 413 nm (ε, 27,653 L mol −1 cm −1 ) without any d-d bands. The absence of the latter may presumably be due to the intrusion of trails of intense CT bands into the visible portion of the spectrum, which obscures the weaker d-d bands [25,29].…”

Section: Description Of Crystal Structuresmentioning

confidence: 99%

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X-ray structures of iron(III) and cobalt(III) complexes containing 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethylthiosemicarbazone

Pal

Barik²,

Aich

et al. 2006

Struct Chem

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Iron(III) and cobalt(III) complexes of types [Fe(LEt) 2 ]ClO 4 ·3/2C 6 H 6 (1) and [Co(LEt) 2 ]ClO 4 ·2CH 2 Cl 2 (2) with a new pyrimidine-derived thiosemicarbazone ligand, 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethylthiosemicarbazone (HLEt), having N, N, S donor centers have been synthesized and characterized by X-ray crystallography. The structural study shows distorted octahedral geometry for both 1 and 2 with MN 4 S 2 chromophores. The space group of 1 is C2/c (monoclinic) and that of 2 is P2 1 2 1 2 1 (orthorhombic). The electrochemical electron transfer study in MeCN solutions shows a one-electron reductive response presumably due to a metal(III)-metal(II) couple.

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Section: Description Of Crystal Structuressupporting

confidence: 80%

Section: Description Of Crystal Structuresmentioning

confidence: 99%

Section: Description Of Crystal Structuresmentioning

confidence: 99%

See 1 more Smart Citation

X-ray structures of iron(III) and cobalt(III) complexes containing 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethylthiosemicarbazone

Pal

Barik²,

Aich

et al. 2006

Struct Chem

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“…[38][39][40] This fact was further confirmed by the appearance of two new bands in the range 1572-1596 cm −1 and 752-754 cm −1 that corresponds to υ(C=N-N=C) and υ(C-S) stretching vibrations respectively. 41 …”

Section: Infrared Spectramentioning

confidence: 99%

Nickel(II) complexes containing ONS donor ligands: Synthesis, characterization, crystal structure and catalytic application towards C-C cross-coupling reactions

et al. 2015

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Nickel(II) complexes containing thiosemicarbazone ligands [Ni(L) 2 ] (1-3) (L = 9,10-phenanthrenequinonethiosemicarbazone (HL 1 ), 9,10-phenanthrenequinone-N-methylthio semicarbazone (HL 2 ) and 9, 10-phenanthrenequinone-N-phenylthiosemicarbazone (HL 3 )) have been synthesized and characterized by elemental analysis and spectroscopic (IR, UV-Vis, 1 H, 13 C-NMR and ESI mass) methods. The molecular structures of complexes 1 and 2 were identified by means of single-crystal X-ray diffraction analysis. The analysis revealed that the complexes possess a distorted octahedral geometry with the ligand coordinating in a uni-negative tridentate ONS fashion. The catalytic activity of complexes towards some C-C coupling reactions (viz., KumadaCorriu, Suzuki-Miyaura and Sonogashira) has been examined. The complexes behave as efficient catalysts in the Kumada-Corriu and Sonogashira coupling reactions rather than Suzuki-Miyaura coupling.

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“…Cyclic voltammetry support the Ru II /Ru III redox behavior of this metal in trinuclear complexes. [167][168][169][171][172][173][174][175][176][177], where a uninegative thiosemicarbazone coordinates to the Co center via, N 4 , N 3 , S, or O, N 3 , S-donor atoms (N 4 or O belong to R 1 group, pyrazolyl, pyridine, or uracil moiety at C 2 carbon atom). Fig.…”

Section: Reaction Of Trans-[rumentioning

confidence: 99%

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

Lobana¹,

Sharma²,

Bawa³

et al. 2009

Coordination Chemistry Reviews

603

332

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Cobalt(III) complexes with 2-acetyl- and 2-formylpyridine 4N-methylthiosemicarbazones

Cited by 49 publications

References 22 publications

X-ray structures of iron(III) and cobalt(III) complexes containing 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethylthiosemicarbazone

X-ray structures of iron(III) and cobalt(III) complexes containing 2-S-methyl-6-methyl-4-formylpyrimidine-N(4)-ethylthiosemicarbazone

Nickel(II) complexes containing ONS donor ligands: Synthesis, characterization, crystal structure and catalytic application towards C-C cross-coupling reactions

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

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