Lanthanide hybrids of covalently-coordination cooperative post-functionalized metal–organic frameworks for luminescence tuning and highly-selectively sensing of tetrahydrofuran

Abstract

A new class of Ln-MOFs (Ln = Eu, Tb, Eu/Tb, Sm) are synthesized through a post-synthetic modification of the parent MOF, UMCM-NH2. The luminescence spectra of Eu-MOF, Tb-MOF and Eu/Tb-MOF exhibit the characteristic emission bands of ligands and corresponding Ln3+, particularly Eu3+. Multi-color luminescence could be modulated by adjusting the excitation wavelength of the Eu-MOF and Tb-MOF. What's more, white-light emission may be realized by co-doping the Eu3+ and Tb3+ due to the synergistic contribution of the three luminescence centers. In addition, the Eu-MOF is selected as a luminescence sensor to explore the potential of sensing organic small molecules. Most interestingly, it exhibits a highly selective, sensitive and rapid response to THF, which could be distinguished easily by the naked eye under UV-light irradiation. Consequently, Eu-MOF is a promising candidate as the "turn on" fluorescent probe for detecting THF that has been rarely reported.

Technology for the Remediation of Water Pollution: A Review on the Fabrication of Metal Organic Frameworks

“…After coordination covalent modification, the coordination bonds of the metal-organic chain are formed. Some metal ions are possibly introduced to the MOF skeleton through an organic chain, thus forming coordination bonds [99]. A simple process of coordinate covalent post-modification is shown in Figure 7.…”

“…A simple process of coordinate covalent post-modification is shown in Figure 7. According to the breaking and formation of chemical bonds, PSM is often divided into covalent post-modification [98], coordinate covalent post-modification [99], and post-synthesis deportation [100]. These methods dominate PSM [75].…”

Tracking the Multistep Formation of Ln(III) Complexes with in situ Schiff Base Exchange Reaction and its Highly Selective Sensing of Dichloromethane

“…The “Holy Grail in Chemistry” emphasizes the importance of advancing research on ultrasensitive molecules for detection, which is a huge challenge 22 . Over the past few years, interest in finding highly selective and sensitive approaches to detecting an organic molecule with multitudes of potential health and environmental impacts has increased 23–27 . Among such organic molecules is dichloromethane (CH 2 Cl 2 ), which is one of the most commonly used organic solvents in chemical production, film production, and pharmaceutical fields; however, its large emissions lead to water and air pollution 28 .…”

“…Therefore, for certain specific environments and the rational allocation of resources, developing a real-time, rapid detection method for CH 2 Cl 2 is urgent. The design, synthesis, and development of selective and sensitive organic molecule sensors are research hotspots 23–27 . although the rapid detection of many organic molecules such as tetrahydrofuran (THF) 27 .…”

“…The design, synthesis, and development of selective and sensitive organic molecule sensors are research hotspots 23–27 . although the rapid detection of many organic molecules such as tetrahydrofuran (THF) 27 . and acetonitrile 26 .…”