H and J-Molecular Aggregates: Deviations from Classical Behavior

Paranitroaniline (PNA), a prototype example of donor-¿-acceptor nitroanilinic system, is known to possess large NLO response. However, in the literature, two PNA dimer conformations dimeric structure H and J-dimeric structure have accounted for the global minimum. Among polyacenes, tetracene (TC) and its derivatives represented a perfect energetic balance for both SF as well as its inverse process of triplet-triplet recombination. However, in literature, several other factors including superradiance and excimer formation have also been accounted for in explaining the behavior of complex Photolumniscence TCs. Therefore, the need for aggregate structure elucidation was more than warranted topical and unambiguous experimental and computational data. The work presented in this book focuses on understanding and controlling the aggregates structure, Bonding and electronic properties of nitroaniline and tetracene colloidal aggregates. Establishing the correlation between varied excited state dimeric structures with the unusual behavior PI comprised the other central goal of present work.