RhB‐Embedded Zirconium–Naphthalene‐Based Metal–Organic Framework Composite as a Luminescent Self‐Calibrating Platform for the Selective Detection of Inorganic Ions

Abstract

As eries of dye@MOF composites were synthesized through in situ encapsulationo fl uminous rhodamine B( RhB) molecules into ab lue-emissive zirconium-naphthalene-based metal-organic framework (Zr-MOF). The fabricated RhB@Zr-MOFc omposites exhibit tunable dual-emissive characteristics due to the process of resonante nergy transfer from Zr-MOF to RhB. Notably,o ne of the RhB@Zr-MOF composites (R@D3)e xhibited aw eak emissiona t4 20 nm and as tronge mission at 607 nm, for which the two emissions possess large distinctionsi nl ocation and intensity and can be referenced with each other in sensing analytes. By using relative fluorescence intensity insteado ft heir absolute fluorescencei ntensitya st he detection signals, R@D3s erved as ab uilt-in self-calibrated platformt os electively detect Fe 3 + and Cr 2 O 7 2À ions in water.C ompared with the pristine Zr-MOF,t he R@D3 composite showse nhanced sensing selectivity to Fe 3 + and higher sensibility to Cr 2 O 7 2À .T hiss tudy displays the advantageso fc ombining organic dyes with robust Zr-MOFsi nt uning fluorescencea nd sensing performance.

Dye‐encapsulated nanocage‐based metal–organic frameworks as luminescent dual‐emitting sensors for selective detection of inorganic ions

“…The RFI of RhB@Mn‐MOF in solution is represented by I 0R in the absence of analyte and I R in the presence of analyte. Residual fluorescence ratio (RFR), defined as I / I 0 or I R / I 0R is introduced to intuitively judge the quenching effect in sensing different metal nitrate compounds 53 …”

Recent Progress in Luminous Particle‐Encapsulated Host–Guest Metal‐Organic Frameworks for Optical Applications

“…Either excess or deficiency of iron will lead to physiological disorders and even serious diseases. [220][221][222] Hence, the development of facile methods for rapid quantitative detection of iron is highly desirable. Guo et al construct a ratiometric fluorescent sensor for Fe 3+ by loading CDs into a Eu 3+ -doped MOF through a simple stirring method.…”

Metal‐Organic Frameworks‐Based Fluorescent Nanocomposites for Bioimaging in Living Cells and in vivo†

“…For example, encapsulating luminescent RhB molecules into a blue‐emissive zirconium‐naphthalene‐based MOFs through an in situ synthetic strategy could be used for dual‐emitting detection of specific ions. [ 37 ] RhB with red fluorescence emission has been used as the fluorescent indicator for fluorescence detection and imaging. [ 38‐39 ] Dual‐emitting fluorescent Zr‐MOFs could monitor the pH changes in living cells by fluorescence imaging.…”