Colorimetric and Smartphone-Based Dual-Mode Rapid Detection of Congo Red Using Iron Oxide Quantum Dots.

Congo red is toxic to humans and the environment and persists in the environment for long periods. Therefore, developing a rapid detection method for Congo red is crucial. In this study, iron oxide quantum dots (IOQDs) were synthesized and employed for dual-mode detection (colorimetric and smartphone-based) of Congo red in real samples.

Steric and electronic influence on Cu-Cu short contacts in β-thioketiminato tricopper(I) clusters.

A series of β-thioketiminate copper(I) complex trimers [LCu] were synthesized by modifying the ligand framework with electron-withdrawing groups (F and Cl) or electron-donating groups (Pr and Me) at the -aryl ring as well as with CF groups on the chelating backbone. This ligand modification significantly impacts the enhancement of Cu⋯Cu short contacts, which can be rationalized by using steric and electronic factors of the chelated ligand. We observed that this intramolecular cuprophilicity among [LCu] complexes is primarily governed by the size of -aryl -substituents.

Denticity governs the formation of β-thioketiminato tri-copper(I) and mono-copper(I) complexes.

Two classes of β-thioketiminate ligands, SN chelators (HL1 and HL2) and SNN chelators (HL3 and HL4), were prepared to understand their coordination behavior in copper(I) complex formation. The formation of these copper(I) complexes bearing β-thioketiminate ligands and their corresponding adducts toward isocyanide, PPh, and CO was investigated to address two important issues. First, whether the denticity governs the copper(I) thiolate species formation between SN chelators and SNN chelators.