Organic compounds that interact both with certain biological targets and display specific photophysical properties can be utilized as molecular tools to visualize and possibly affect disease related processes taking place in living organisms. In this regard, porphyrins are a class of naturally occurring molecules that possess intriguingly interesting photophysical properties where they can act as luminescent probes by emitting detectable light, as well as photosensitizers in the light mediated therapy denoted photodynamic therapy. In this thesis, the porphyrin structure has been synthetically combined with other types of molecules to achieve compounds with desirable multimodal characteristics. During my doctoral studies at Chemistry department at Linköping university, several people have contributed to the scientific work that I carried out, helped me with the everyday matters or supported me in general. I would like to thank all these fantastic people and especially acknowledge some of them: Professor Peter Nilsson, my supervisor, for all the guidance and support through the years. You are an expert on helping me see the possibilities in seemingly tiny things that would eventually lead to fascinating research projects. Professor Peter Konradsson, my co-supervisor, for the help in navigating in the world of organic chemistry and for the all the philosophical discussions about the rest of the world. All the past and present members of the Nilsson group: Therése for always being the wise and calm ideal of a researcher; Hamid with his never-disturbed and inspiring enthusiasm in synthetic chemistry; the chatty and positive Bisse for all her advice on chemistry and life, and for all the enjoyable coffee breaks and lunches; Elisabet for being one of the few downright good people left in this world and surely one of the persons with the highest number of different interests; Hanna for the fruitful collaborations and pleasant company; Karin, Rozalyn, Leffe, Jeff, Andreas, Timmy and Mikaela for all the help and for all the memorable moments at works. Mathias Elgland, another downright good person with a plethora of positive qualities ranging from being an excellent chemist to a worthy friend. I am deeply grateful for all the scientific collaborations and the friendship along the side. Thank you for your most enjoyable company over my many years at Linköping university! Linda Lantz, my roomie and a dear colleague and a friend, for cheering my days with interesting scientific and even more interesting non-scientific talk. You inspire with you strong and independent angles of life philosophy. Marcus Bäck, for being a truly understanding and reliable friend and a helpful colleague, and for backing me up with "Det gör du rätt i". Jakob Wallgren for m/baking my days with all these splendid pastries and with your pleasant company! People in Organic chemistry corridor: Xiongyu Wu, a true sensei in chemistry; Yun, Tobias, Roger.