A Family of Metal–Organic Frameworks with a New Chair-Conformation Resorcin[4]arene-Based Ligand: Selective Luminescent Sensing of Amine and Aldehyde Vapors, and Solvent-Mediated Structural Transformations

Abstract

By utilizing a new chair-conformation resorcin[4]arene-based octacarboxylate ligand, four functional metal−organic frameworks (MOFs), namely, [ 8,14,20-tetramethylphenyl-4,6,10,12,16,18,22,24-octa-carboxymethoxyresorcin[4]arene and DMF = N,N-dimethylformamide), were solvothermally synthesized and structurally characterized. In 1, each L 8− anion bridges eight Cd(II) atoms to give a threedimensional (3D) (4,8)-connected (4 6 )(4 12 .6 10 .8 6 ) framework. In isostructural 2 and 3, each L 8− anion links eight adjacent Zn(II) or Co(II) atoms to yield a 3D (4,8)-connected (4 6 )(4 11 .6 12 .8 5 ) net. In 4, each L 8− anion only bridges four Co(II) atoms by using its four carboxylates each in a monodentate coordination mode to generate an infinite one-dimensional (1D) chain. Remarkably, the highly selective luminescent sensing of amine and aldehyde vapors was studied for 1 and 2 as fluorescent sensors. Importantly, a solvent-induced structural transformation from the 1D chain to the 3D porous framework between 3 and 4 was also investigated in detail.

A Solid-State Luminescent Cd(II) Supramolecular Coordination Framework Based on Mixed Luminophores as a Sensor for Discriminatively Selective Detection of Amine Vapors

“…Thus, 1 can be only considered as an efficient chemical sensor for NH 3 and EDA detection. To the best of our knowledge, the shift of emission bands in this work is the largest spectral change for NH 3 and EDA detections. − ,,− Also, this work reports the first time for selective luminescent sensing of NH 3 and EDA vapors with considerably different emission color change (see Table ).…”

“…[9][10] Owing to the same chemical and physical characteristics of the amines, the development of selective sensors is not straightforward. [11][12] Consequently, the construction of highly selective luminescent sensor for amine vapors becomes a challenging topic.…”

“…These signal outputs are rarely specific and more difficult to detect. , A much more attractive mechanism is the shift of luminescent wavelength upon interaction with the analytes, leading to a visibly change of the emission color. Luminescent sensors undergoing an emission color change upon amine detection have rarely been reported. , Because of the same chemical and physical characteristics of the amines, the development of selective sensors is not straightforward. , Consequently, the construction of highly selective luminescent sensor for amine vapors becomes a challenging topic.…”

Optical chemosensors for the gas phase detection of aldehydes: mechanism, material design, and application

“…Different from the above detection types, Shen et al 113 161 The sensor mechanism is based on fluorescence quenching, which in turn is due to the competitive absorption between the MOFs and aldehydes, both in the wavelength range of 240-300 nm. When the aldehydes are present in high concentration, the UV excitation would be mostly absorbed by aldehydes, leaving no excitation of the MOF, thus resulting in decrease in fluorescence.…”

Three resorcin[4]arene-based lanthanide-coordination polymers with multifunctional photoluminescence sensing properties

“…The precursor 1,3-bis[(methoxycarbonyl)methoxy]benzene (L1) was synthesized according to the literature procedure. 28 A mixture of L1 (2.56 g, 10.0 mmol) and hexaldehyde (1.0 g, 10 mmol) in dichloromethane (30 mL) was stirred at ice bath for 0.5 h with dropwise addition of BF 3 $OEt 2 (6 mL). Then the mixture was stirred at room temperature overnight.…”