Photophysical property and thermal stability of a simple protonated hydrogen bonding complex: 3-Amino-5-nitro-[2,1]benzoisothiazole-p-toluenesulfonate

Autor: Smriti Arvind Nahata, Subbalakshmi Jayanty, Santosh Ranga, Himabindu Battula, Anwarhussaini Sd, Lipi Deepaakshi Patnaik
Rok vydání: 2021
Předmět:
Zdroj: Journal of Molecular Structure. 1225:129090
ISSN: 0022-2860
DOI: 10.1016/j.molstruc.2020.129090
Popis: A straightforward reaction between 3-amino, 5-nitro [2,1] benzoisothiazole (ANB), and p-toluene sulfonic acid (PTSA) through a facile combination of individual ethanolic solutions resulted in a contemporary 1:1 protonated complex -3-amino, 5-nitro-benzoisothiazole-p-toluene sulfonate (ANBPTS). X-ray crystallography revealed proton transfer, connectivity of cationic and anionic species through hydrogen bonds and several short contacts leading to the stability and interesting material attributes. Acquired salt was characterized by various spectroscopic and microscopic techniques. Enhanced fluorescence was observed in polar aprotic solvents than in polar protic solvents and solid-state, good agreement with the observed greater lifetime in DMF solution. A large stokes shift was noticed in the range of 144 to 163 nm. Thermogravimetric analysis showed appreciable thermal stability of ~273 °C. The experimental optical band gap ~3.70 eV was compatible with the theoretical band gap calculated as 3.67 eV and 3.82 eV for the electronic transitions from SOMO to LUMO, due to two singly occupied molecular orbitals. Scanning electron microscopy images of the spin-coated and drop casted films showed microcrystalline structures of ~35 nm. Dynamic light scattering study (DLS) revealed ~300 nm-sized aggregates. However, the obtained compound showed poor antibacterial and antifungal activity when compared to the standard bacterial and fungal species.
Databáze: OpenAIRE
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