1. Department of Chemistry; New Horizon College of Engineering; Bangalore 560 103 India
2. Department of Physics; B N M Institute of Technology; Bangalore 560 070 India
3. Department of Chemistry; B N M Institute of Technology; Bangalore 560 070 India
4. Department of Chemistry; Malnad College of Engineering; Hassan 573 202 India
5. Department of Chemistry; School of Engineering and Technology, Jain University; Ramanagara 562 112 India