1. Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, West Bengal, India, Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, West Bengal, India, Department of Chemistry, Dinabandhu Andrews College, Garia, Kolkata, West Bengal, India, and Department of Engineering Science, Haldia Institute of Technology, Haldia-721657, Midnapore East, India.