Neutral Nitrogen Donor Ligand‐based MOFs for Sensing Applications

Abstract

Neutral nitrogen donor (N‐donor) ligand‐based MOFs, with their enticing features inclusive of facile synthesis, labile metal‐ligand bond, framework flexibility, atomic level tunability renders them appealing in molecular recognition‐based studies. Intriguingly, the flexibility in such systems (owing to weaker metal‐nitrogen bonds) promote maximization of host‐analyte interactions, which is critical for the manifestation of a signaling response. Such host‐analyte interactions can be tapped by discerning any change in the physical properties associated with the system, such as optical, fluorometric, chemiresistive, magnetic, dielectric constant, mass. This minireview presents a brief discussion on the various types of signal transduction pathways unveiled hitherto using neutral N‐donor ligand‐based MOFs and the fundamental insight into the signal‘s origin. Moreover, an elaborate compilation of the recent examples in this field has been presented. Also, the untapped prospects have been highlighted, which may serve as a beacon to drive future research.

Advances in metal–organic frameworks for water remediation applications

“…This included the use of elevated temperature during the reaction procedures, and hence many groups employed methodologies based on reaction temperature and reactor. 27 Ghosh et al 28 reported the water stability of neutral nitrogen-donor ligand-based MOFs, which exhibited high sensing ability.…”

A luminescent cationic MOF and its polymer composite membrane elicit selective sensing of antibiotics and pesticides in water

“…Following the principle of HSAB (hard and soft acids and bases), the neutral and tripodal tris(imidazolate) linker was utilised. 53,54 These factors facilitated metal-ligand coordination to afford a cationic framework featuring high chemical stability, which primarily arises from the complete shielding of the metal centres by the linker scaffolds. Effectively, to form a stable cationic LMOF, we selected the d 10 transition metal Cd(II) to coordinate with the highly conjugated tris(imidazolyl) ligand, L, (1,1′-(5′-(4-(1H-imidazol-1-yl) phenyl)-[1,1′:3′,1″-terphenyl]-4,4″-diyl) bis(1H-imidazole).…”

Hydrolytically Stable Luminescent Cationic MOF for Selective Detection of Toxic Organic Arsenic in Water

“…With a strategic choice of the organic ligand and metal center, MOFs could be made ionic; in terms of their utilization toward fluorescence sensing, cationic MOFs , are yet to be explored well. By taking leverage of π-rich organic linkers along with metal ions, MOFs can exhibit exceptional luminescence properties. − Luminescent MOFs (L-MOFs) have come forth as competent sensory materials toward toxic small molecules, − oxo-anions, heavy metal ions, and anions, along with noxious gases . Hitherto, the L-MOFs fabricated for organic arsenic detection have been rarely explored.…”