**Acknowledgements**

The authors would like to convey their gratefulness to National Centre of Excellence in Physical Chemistry, University of Peshawar for providing us necessary support and facilities to carry out this study.

### **Author details**

Tahira Mahmood\*, Abid Ullah and Rahmat Ali National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan

\*Address all correspondence to: tahiramahmood@uop.edu.pk

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