Acknowledgement

I express my deep gratitude to my PhD mentor, Prof. Dr. Wolfgang Rettig, who kindled my interest in the field of Photophysics. His esteemed guidance and constant encouragement helped me to achieve my goal in my area of research. I would like to thank him for his unconditional support apart from my research during my stay in Berlin.

My sincere thanks to Dr. Monique Martin, ENS, Paris, who gave me an opportunity to do my transient absorption measurements in Paris. I extend my thanks to her colleagues for making my stay enjoyable.

I also would like to thank Prof. René Lapouyade and Prof. A.I. Tolmachev for providing the compounds for the most parts of the investigations carried out in this thesis.

I thank Dr. Wilfried Weigel with whom I have always had friendly discussions regarding my work. His technical and academic expertise has helped me to put this thesis into a good shape. Apart from his academic help, he paved a stepping stone to learn “Ice skatting” in Berlin.

I also thank Mr. Hani-El-Gezawi, Dr. Vladimir Kharlanov and Dr. Liudmil Antonov for their help and discussion throughout my work.

My special thanks go to Mrs. Annette Rothe, who always had helping hands from the beginning until ending of my stay in Berlin. I have learned better German from her rather than from the language school.

I would like to thank friends and co-workers in the Institute of chemistry for helping me during my course of study.

Last but not least, I thank my parents and family, who encourage me always to do my work what I wish for. Their innumerable support and blessings always motivate me to go further into the pinnacle of success.


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