Role of exciton delocalization in chiroptical properties of benzothiadiazole carbon nanohoops.

Development of chiral organic materials with a strong chiroptical response is crucial to advance technologies based on circularly polarized luminescence, enantioselective sensing, or unique optical signatures in anti-counterfeiting. The progress in the field is hampered by the lack of structure-property relationships that would help designing new chiral molecules. Here, we address this challenge by synthesis and investigation of two chiral macrocycles that integrate in their structure a pseudo-meta [2.

Rapid on-site and naked-eye detection of common nitro pesticides with ionic liquids.

Rapid 'in-field' detection of environmentally hazardous organophosphorus and nitro-containing pesticides is highly essential due to the lethal effects caused by the inhibition of the activity of acetylcholinesterase (AChE). In our present study, we demonstrate a novel sensing approach for the simultaneous analysis of five widely used pesticides (methyl parathion, pendimethalin, dicloran, trifluralin, and PCNB) based on the Meisenheimer complex formation between polynitro aromatic compounds (pesticides) and a nucleophile. This colorimetric determination of pesticides involves the use of an ionic liquid, tetrabutylammonium hydroxide (TBAOH), as the nucleophile, which is titrated against different concentrations of pesticides.

Synthesis and photovoltaic application of NIR-emitting perylene-monoimide dyes with large Stokes-shift.

An efficient Sonogashira coupling protocol is developed for tetra-alkynylation at the and -positions of the perylene-monoimide (PMI) dye in its PMI(Br) form. The absorption band for these PMI dyes covered from the visible to Near-infrared (NIR) region and PMI(NMe) is found to exhibit a record-breaking Stokes-shifted NIR emission with good photovoltaic properties.