Cobalt(II) complexes with pyridine and 5-[(E)-2-(aryl)-1-diazenyl]-quinolin-8-olates: synthesis, electrochemistry and X-ray structural characterization

Nine new cobalt(II) compounds, trans-[Co(L PAQ ) 2 (Py) 2 ] (1), trans-[Co(L PAQ ) 2 (3-MePy) 2 ] (2), tran s-[Co(L MeAQ ) 2 (Py) 2 ] (3), trans-[Co(L OMeAQ ) 2 (Py) 2 ] (4), trans-[Co(L OEtAQ ) 2 (Py) 2 ]·2(H 2 O) (5), tran s-[Co(L CAQ ) 2 (Py) 2 ] (6), trans-[Co(L BAQ ) 2 (Py) 2 ] (7), ci s-[Co(L...

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Published inJournal of coordination chemistry Vol. 71; no. 16-18; pp. 2856 - 2874
Main Authors Basu Baul, Tushar S., Nongsiej, Khrawborlang, Rocha, Bruno G. M., Guedes da Silva, M. Fátima C.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 17.09.2018
Taylor & Francis Ltd
Subjects
Aromatic compounds
Chemical analysis
cobalt
Cobalt compounds
Configurations
Crystals
Electrochemistry
Infrared analysis
Infrared spectroscopy
Ligands
Magnetic measurement
magnetic moment
NMR spectroscopy
secondary ligands
Single crystals
Spectrum analysis
Structural analysis
structure elucidation
Substituted quinolin-8-olate
T shape
X-ray diffraction
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Summary:Nine new cobalt(II) compounds, trans-[Co(L PAQ ) 2 (Py) 2 ] (1), trans-[Co(L PAQ ) 2 (3-MePy) 2 ] (2), tran s-[Co(L MeAQ ) 2 (Py) 2 ] (3), trans-[Co(L OMeAQ ) 2 (Py) 2 ] (4), trans-[Co(L OEtAQ ) 2 (Py) 2 ]·2(H 2 O) (5), tran s-[Co(L CAQ ) 2 (Py) 2 ] (6), trans-[Co(L BAQ ) 2 (Py) 2 ] (7), ci s-[Co(L BAQ ) 2 (3-MePy) 2 ] (8a) and tran s-[Co(L BAQ ) 2 (3-MePy) 2 ]·2(3-MePy) (8b) (primary ligand: L XAQ  = substituted 5-[(E)-2-(aryl)-1-diazenyl]quinolin-8-olate; secondary ligands: Py = pyridine, 3-MePy = 3-methylpyridine), have been synthesized and characterized by elemental analysis, IR and UV-vis spectroscopy. Magnetic measurements of the cobalt compounds were performed in solution by 1 H NMR spectroscopy using the Evans' method while their redox properties were studied by cyclic voltammetry. Single-crystal X-ray diffraction analysis of the compounds revealed their octahedral geometries and trans configuration, except for 8a, which has a cis configuration. Intermolecular noncovalent interactions were detected, π···π interactions in 5, C - H···π interactions in 2 and C - H···π edge-to-face (T-shaped) arrangements in 3, 4, 6, and 7.
ISSN:0095-8972
1029-0389
DOI:10.1080/00958972.2018.1506876