1. Department of Chemistry, Pondicherry University, Puducherry 605014, India
2. Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan R.O.C
3. Department of Chemistry, Nirmala College for Women, Coimbatore 641018, India
4. Department of Physics, University of Limerick, Castletroy, Limerick V94 T9PX , Republic of Ireland