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Kalarani N. Sangeetha S. Kamalakannan P. Venkappayya D. 《Russian Journal of Coordination Chemistry》2003,29(12):845-851
Complexes of Fe(III), Co(II), Ni(II), and Cu(II) with 4-dicyclohexylaminomethyl antipyrine (DCHAMA, L) were prepared and characterized by elemental and chemical analyses, IR, electronic absorption, 1H NMR and EPR spectroscopies, thermal analysis, and magnetic susceptibility measurements. The stoichiometry of the complexes was found to be MLX2, MLX3, or MLX2(H2O)2 where X = Cl or NO3. The ligand exhibits a bidentate mode of coordination. Thermal analysis of the chloro complexes shows a three stage decomposition pattern for the Cu(II) complex and a two stage decomposition pattern for Fe(III) and Co(II) complexes to yield the respective metal oxides as the end product. Kinetic and thermodynamic parameters such as n, E
a, H
#, S
#, and G
# were calculated using Coats–Redfern and Madhusudhanan–Krishnan–Ninan integral methods. The coordination number of the metal atom is found to influence the thermal stability of the complexes. The antimicrobial screening shows that the four-coordinated complexes are more active than the five- and six-coordinated ones and DCHAMA. 相似文献
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The association constants for α,α'-dialkylpyrrole:pyridine systems determined from infrared intensity measurements of the NH absorption band of the non-bonded pyrroles indicate that, although the α-substituents sterically hinder the formation of the NH-N bonded complexes, there is little evidence for any significant NH-π bonding. 相似文献
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