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Shiv Nadar University

A series of 16-membered macrocyclic complexes of cobalt(II) and nickel(II) of the type [M(H2Cy1-4)] have been synthesized and characterized on the basis of spectral, magnetic and conductivity studies. The macrocyclic ligands H4Cy1-4 are tetrabasic having four imido hydrogen but behave in a dibasic manner. Out of eight nitrogens, four imido and four imino, ligands utilize four imido nitrogens for square planar coordination forming four 7:5:7:5 chelate rings giving rise to a 16 membered macrocyclic framework. The red coloured nickel(II) complexes are diamagnetic in nature, whereas cobalt(II) complexes with chocolate brown colour are of low spin type. Low molar conductivity values in the range 3-7 ohm-1 cm2 mol-1 suggest complexes to be non-electrolytic in nature. High dilute conditions generally employed in the synthesis of macrocyclic complexes in order to dispense with polymerization reaction have been avoided in the present study and advantage of orientation effect has been taken to have high yield.

World University root node

Chemical Engineering

(SoE) School of Engineering

Asian Journal of Chemistry

Metal dihydrazide precursors as building blocks for new macrocyclic architectures with tetradentate octaaza dibasic ligands

Semicarbazones of substituted benzaldehydes were synthesized and their effect on endogenous protein hydrolysis in liver homogenate was studied. It was found that p-nitrobenzaldehyde semicarbazone exerted maximum effect.

Effect of semicarbazones on endogenous protein hydrolysis in liver homogenate

Synthesis of 14-membered macrocyclic complexes of cobalt(II) and nickel(II) of the type [M(mac1-3)] are reported. The complexes have been characterized on the basis of analytical, metal conductivity, magnetic susceptibilities, infrared, electronic, spectral data and electrochemical studies. Infrared spectral data show that the ligands behave in a diabasic tetradentate manner in all the complexes. Electronic spectral data and magnetic moment value are indicative of square planar geometry. The nickel complexes were red or orange to yellow in colour, whereas cobalt(II) complexes were chocolate brown in colour. High dilute conditions were maintained to dispense with polymerization reaction. The thermodynamic parameters E1/2 are found within the range -1.34 to -1.50 V.

Synthesis, spectroscopic and electrochemical studies of Cobalt(II) and Nickel(II) macrocyclic complexes derived from Oxalodihydrazide and Aldehydes/Propanone