Zn-MOF74 as a “turn-on” fluorescent chemosensor for recognition and detection of water in acetone and Al3+ in ethanol with high selectivity and sensitivity

Nanoscale carbon dot-embedded metal–organic framework for turn-on fluorescence detection of water in organic solvents

“…The linear regression equation of the fluorescence intensity at 450 nm and water content change from 0% to 70% v/v can be written as y = 1053.335 x + 15 306.820 and the R 2 value is 0.996, indicating the detection range of water in ethanol is in the range 0–70% v/v. In accordance with the formula LOD = 3 σ / S ( σ = a standard deviation of the fluorescence test for 7 blank solutions, S is the slope of the linear equation), 3 the limit of detection (LOD) of CDs@HKUST-1 for water in ethanol was calculated to be as low as 0.70% v/v as shown in Table S2. ‡ The obtained LOD is less than that found in AEHC (hydrated ethyl alcohol fuel; 0.8% in China, 1.0% in the US, and 4.9% in Brazil).…”

“…1,2 The water content of reaction materials and solvents also has a signicant impact on the yield and selectivity of many sensitive chemical processes. 3 Various traditional techniques including Karl Fischer titration, 4 chromatography, 5 electrochemical analysis 6 and spectroscopic approaches, [7][8][9] have been used to monitor water content in organic solvents. However, these techniques normally require specialized equipment and expert operators, are high cost and time-consuming.…”

“…[14][15][16] Several MOFs have been utilized as uorescent probes for water sensing in organic solvents. 3,[17][18][19][20][21][22][23] These MOFs are mostly derived from rare earth metals (Tb 3+ and Eu 3+ ) and transition metals (Cd 2+ and Zn 2+ ). However, lanthanide metals are expensive and scarce, and certain metal ions, for example Cd 2+ , are very hazardous.…”

A dual-function [Ru(bpy)3]2+ encapsulated metal organic framework for ratiometric Al3+ detection and anticounterfeiting application

“…Al, which is widely used in industrial production, food additives, and cookware, can enter the human body through food and drinking water. 1–5 The excessive intake of Al 3+ ions may harm the central nervous system, leading to a threat to human health directly or indirectly. 6–9 According to assessments by the WHO, the average daily intake limit of Al 3+ ions is about 3–10 mg per day.…”

Two Terbium Metal–Organic Frameworks Showing Fluorescence Sensing and Proton Conductivity

“…It is well known that aluminum (Al) is the most abundant metallic element in the Earth’s crust and widely used in household and industrial fields, which is also an important trace element for the human body. − However, excessive Al 3+ in the human body will cause cranial nerve degeneration and memory decline, which will further develop into Alzheimer’s disease, Parkinson’s disease, and other human diseases. − The same main group element gallium (Ga) is also widely used in household and industrial fields such as chemical synthesis, semiconductor industry, fuel storage, and medical fields. − It is also carcinogenic and toxic to animals and humans. Long-term exposure may lead to some serious diseases, including gastrointestinal diseases, coma, anemia, leukopenia, and skin cancer. , With the continuous development of industries, both ions cause environmental pollution of water and soil, which further affects human health. , Therefore, rapid and accurate detection of these two ions is of great interest for analytical chemists .…”