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Acknowledgements
The authors thank Prof. S. Muthusamy, School of Chemistry,
Bharathidasan University, Tiruchirappalli-24 for the NMR mea-
surement, Dr. M. Ashok, Assistant Professor, National Institute
of Technology, Tiruchirappalli-18 for the UV–vis–NIR measure-
ment and Dr. K. Sivaji, Assistant Professor, Department of Nuclear
Physics, University of Madras, Chennai-25 for the microhardness
measurement. The authors thank the University Grant Commis-
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