A chalcone-based naked-eye colorimetric chemical sensor, (E)-4-hydroxy-3-(3-(4-methoxyphenyl)acryloyl)-2H-chromen-2-one 1a, was developed for selective and sensitive recognition of Cd²⁺ in mixed aqueous–organic media.

Mercury, a highly toxic heavy metal, poses significant environmental and health risks, necessitating the development of effective and responsive techniques for its detection. Organic chromophores, particularly small molecules, have emerged as promising materials for sensing Hg²⁺ ions due to their high selectivity, sensitivity, and ease of synthesis. In this review article, we provide a systematic overview of recent advancements in the field of fluorescent chemosensors for Hg²⁺ ions detection, including rhodamine derivatives, Schiff bases, coumarin derivatives, naphthalene derivatives, BODIPY, BOPHY, naphthalimide, pyrene, dicyanoisophorone, bromophenol, benzothiazole flavonol, carbonitrile, pyrazole, quinoline, resorufin, hemicyanine, monothiosquaraine, cyanine, pyrimidine, peptide, and quantum/carbon dots probes. We discuss their detection capabilities, sensing mechanisms, limits of detection, as well as the strategies and approaches employed in their design. By focusing on recent studies conducted between 2022 and 2023, this review article offers valuable insights into the performance and advancements in the field of fluorescent chemosensors for Hg²⁺ ions detection.

The complexity and interconnection of smart cities provide huge political, technical, and socioeconomic challenges for the designers, integrators, and organisations who are responsible for the administration of these new entities. A growing number of studies are concentrating their attention on the safety, privacy, and potential dangers that exist within smart cities. These studies are drawing attention to the dangers that are associated with information security as well as the challenges that smart city infrastructure faces in the management and processing of personal data. This state of the art review of the literature analyses a number of issues pertaining to smart homes, offers a helpful synthesis of the important information found in the primary research, and creates a model for the interaction between smart cities. An overview of smart home research incorporating machine learning, including everything from definition to current research state. The state of art begins with a smart home definition, followed by descriptions of smart home elements, typical research projects, smart home network research status, smart home appliances, and difficulties. The term "smart home" refers to a subcategory of "everyday computing" that includes "smart technology" in order to improve a person's level of convenience, health, safety, and security while also reducing their When controlled by artificial intelligence, the applications for the smart home provide users with context-aware settings, services, and remote control, which significantly increases the level of user satisfaction.

Three new dinuclear complexes [{Cu(OBTTAP)}{Ru(bpy)₂}][PF₆]₂, [{Cu(OBTTAP)}{Ru(phen)₂}]· [PF₆]₂, and [{Cu(OBTTAP)}{RuCp(PPh₃)}][PF₆], and three pentanuclear complexes [{Cu(OBTTAP)}{Ru(bpy)₂}₄]· [PF₆]₈, [{Cu(OBTTAP)}{Ru(phen)₂}₄][PF₆]₈, and [{Cu(OBTTAP)}{RuCp(PPh₃)}₄][PF₆]₄ were synthesized by dative binding of (bpy)₂Ru^II, (phen)₂Ru^II and (PPh₃)CpRu^II moieties to periphery of the [Cu(OBTTAP)] 1. Their structures were characterized using IR, ¹H NMR, UV-Vis, and MALDI-TOF mass spectral data. The peripheral Ru(II) binding caused a hypsochromic shift in the Q-band absorption of the [Cu(OBTTAP)] core while the bathochromic shift to the Soret absorption. They all exhibit a strong emission near λ_max = 425 nm. The excitation profile of this emission shows its origin to Soret absorption. In the cyclic voltammetry, they exhibit multiple reversible oxidation waves due to Ru(II)/Ru(III) and OBTTAP/OBTTAP⁺ processes.