[This corrects the article DOI: 10.1016/j.heliyon.2022.e10070.].

The millions of people who are visually challenged in the world almost invariably have to grapple with the three problems: navigating an environment, recognizing visual content, and social interaction. The use of traditional aids such as white canes and guide dogs, no matter how helpful, is devoid of real-time contextual awareness. This paper presents the Smart Obstacle Detection System, an innovative AI-IoT integrated assistive system that helps the visually impaired be more independent, safe, and socially intera…

The title hydrated salt, C 8 H 11 N 3 2+ ·2Cl − ·H 2 O, is a monoclinic polymorph of the previously reported triclinic form. The compound crystallizes in space group P 2 1 / c with Z ′ = 1. The crystal structure features N—H...O, N—H...Cl and O—H...Cl hydrogen bonds and aromatic π–π stacking interactions, forming a three-dimensional network.

In the title compound, C 29 H 26 BrN, the dihedral angles between the fluorene fused-ring system and the pendant phenyl groups are 67.76 (12) and 88.38 (12)°. In the crystal, weak pairwise C—H...π interactions link the molecules into inversion dimers.

In the title compound, C 6 H 10 N 2 O 2 , the piperazine-2,3-dione ring adopts a half-chair conformation. In the crystal, the molecules are linked by weak C—H...O hydrogen bonds, forming (010) sheets.