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Abstract
Two aroylhydrazones, viz., isonicotinic acid [1‐(furan‐2‐yl)ethylidene]hydrazide (IFEH) and isonicotinic acid [1‐(thiophene‐2‐yl)ethylidene]hydrazide (ITEH) have been synthesized by the interaction of 2‐furyl methyl ketone and 2‐thienyl methyl ketone with isonicotinic acid hydrazide in ethanol. Metal chelates of these hydrazones of the compositions [Cu(IFE)2(H2O)2] · H2O (1), [Ni(IFE)2] · H2O (2), [Co(IFE)2(H2O)2] (3), [Mn(IFE)2(H2O)2] · H2O (4), [Zn(IFE)2] · H2O (5), [Cu(ITE)2] (6), [Zn(ITE)2] (7), [Sm(ITE)2(OAc)(H2O) (8) and [Th(ITE)2(NO3)2] (9) (HOAc=CH3COOH) have been prepared. The coordination behaviour of these two hydrazones with different metal ions has been discussed on the basis of analytical data, electronic spectra, magnetic measurements, thermogravimetric analyses, and infrared and nuclear magnetic resonance spectral studies.
Acknowledgments
The authors are thankful to Justice Gulab Gupta, Vice‐chancellor of this University, for encouragement, and Professor K. K. Mishra, Head, Department of Chemistry, for laboratory facilities and helpful discussions. Analytical facilities provided by the Central Drug Research Institute, Lucknow, India, and the Regional Sophisticated Instrumentation Centre, Indian Institute of Technology, Chennai, India, are gratefully acknowledged. Thanks are also due to Referee I for constructive suggestions.