Multistimuli Responsive Heteroleptic Iridium (III) Complex: Role of Hydrogen Bonding in Probing Solvent, pH and Bovine Serum Albumin (BSA)
This article focuses on the vital role of hydrogen bonding to explain some unusual photophysical behaviors of an ‘Aggregation Induced Emission’ (AIE) active Iridium (III) complex. The preponderance of hydrogen bonding leads the complex to its multifunctional character viz., sensing of base and protein (BSA), pH probing, and solvatochromism. Depending on the hydrogen bonding capacity of the solvents, the emission properties of the complex are changed- i.e., green emission in non-polar solvents, yellowish-green in a chlorinated solvent, bright yellow in a polar aprotic solvent and the weak yellow emission in the polar protic solvent. A robust green emission was obtained with the addition of BSA into 1. The sensitivity of the complex to BSA was measured to 9.3 pM. The mechanisms in all these cases have been explored based on the controlled experiments and computational calculations/studies (DFT, TD-DFT, Docking) The abstract should be a single paragraph that summarises the content of the article.