Femtosecond transient absorption studies of two novel energetic tetrazole derivatives

• Main Authors: Naga Krishnakanth Katturi, Chinmoy Biswas, Nagarjuna Kommu, Sai Santosh Kumar Raavi, Venugopal Rao Soma
• Format: Article
• Language: English
• Published: Elsevier 2021-06-01
• Series: Chemical Physics Impact
• Subjects: Transient absorption; Energetic materials; Nitro compounds; Tetrazoles; Excited-state dynamics
• Online Access: http://www.sciencedirect.com/science/article/pii/S2667022421000062

Excited-state dynamics of two novel energetic nitrogen-rich aryl-tetrazole molecules were investigated using femtosecond transient absorption spectroscopy. The internal conversion from Sn to S1 occurred in the 0.3–0.5 ps; vibrational relaxation within S1 states transpired in a 1.8–5 ps time scale and, subsequently, the intersystem crossing was observed with lifetimes of 7.8 ps and 129 ps. The nitro-substituted tetrazole demonstrated a faster decay with a weaker fluorescence compared to the amino-substituted derivative. We believe that the high nitrogen content in the former resulted in a possible more rapid nonradiative decay.