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mer-Bis(2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazole-4-carbaldehyde 4,4-dimethylthiosemicarbazonato-κ3S,N,O)cobalt(III) tetrafluoroborate

“…The cobalt complexes reported with the 2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazole-4-carbaldehyde 4,4-dimethylthiosemicarbazone ligand in our earlier paper (El-Sawaf et al, 1998) were high-spin octahedral Co II complexes. The present result indicates that, during crystalization, the Co II salt was oxidized to the Co III salt, as has been reported to happen with thiosemicarbazone complexes of Co II with poorly coordinating anions such as BF À 4 (Maichle et al, 1995).…”

“…The title compound was obtained as reported elsewhere (El-Sawaf et al, 1998). Table 1 Selected geometric parameters (Å , ).…”

“…Similarly, antipyrine (2,3-dimethyl-1-phenylpyrazol-5one) and its derivatives possess a wide variety of biological activity. We have reported the preparation and characterization through elemental analysis, physical and spectral studies, of coordination compounds of Fe III , Co II and Co III with 4-formylantipyrine N(4)-methyl-, N(4)-dimethy-and 3-piperidylthiosemicarbazones (El-Sawaf et al, 1998). In this paper, we report the crystal structure of the Co III complex, (I), with 2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazole-4carbaldehyde 4,4-dimethylthiosemicarbazone.…”

Mononuclear and heterobimetallic palladium(II) and platinum(II) complexes containing the mixed ligands N-(2-pyridyl or 2-pyrimidyl) acetamide and tertiary diphosphine

“…The i.r. spectra of the Pd-Co complexes showed either a single strong intensity band at around 350 cm )1 assigned to m(Co-Cl) in a tetrahedral environment [19] of complexes (16), (29) and (41) or two These are listed here for comparison.…”

Coordination modes of 5-pyrazolones: A solid-state overview

“…[Co(HL 43 in MeOH under reflux [95]). In a similar way to previous compounds, the monodeprotonated ligands coordinate the metal through the O, N3 and S atoms.…”