1. Department of Dyestuff Technology; Institute of Chemical Technology; Mumbai 400019 India
2. Molecular Photonics Laboratory; School of Chemistry; Newcastle University; Bedson Building Newcastle upon Tyne NE1 7RU UK
3. Bio-Organic Division; Bhabha Atomic Research Centre; Mumbai 400085 India
4. Laser and Plasma Technology Division; Bhabha Atomic Research Centre; Mumbai 400085 India
5. Laboratoire de Chimie Organique et Spectroscopies Avancées (LCOSA); Ecole Européenne de Chimie; Polymères et Matériaux; Université de Strasbourg; 25 rue Becquerel 67087 Strasbourg Cedex 02 France