Synthesis, characterization, molecular modeling and anti-algal activities of a Schiff base and its m+2 complexes
2011
Khan, Zahid | Tanoli, Muhammad Asad Khan | Maqsood, Zahida T. | Ahmed, Tehseen | Mumtaz, Majid
In present work Four new complexes of 2-hydroxy-5-methylbenzaldehyde-N-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)hydrazine have been synthesized with sometransition metals, i.e. Ni+2, Cu+2 , Co+2 and Zn+2 in non-aqueous medium. Complexeswere characterized by magnetic moment, conductance, scanning electron microscopy(SEM) and spectroscopic investigations including infrared, ultraviolet-visible and atomicabsorption spectroscopy. To support experimental characterization, quantum mechanicaland molecular mechanical (QM/MM) calculations were performed. Experimental resultswith the support of QM and MM computations highlighted the proposition about theligand to be bound to the metal ions in a tridentate manner through its phenolic oxygen,azomethine nitrogen and carbonyl group (C=O). On the basis of experimental andcomputational results, tetrahedral geometry is proposed for Cu+2 complex and distortedtetrahedral geometry is proposed for Zn+2 complex while octahedral geometries areproposed for Co+2 and Ni+2 complexes. For all compounds, anti-cyanobacterial (algicidal)activity was evaluated against three marine cyanobacteria i.e. Pseudoanabaenalonchoides, Lyngbya contorta, and Spirulina major. It was found that the metalcomplexes are more potent anti-cyanobacterial agents than the ligand.
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