Cu-MOF Material Constructed with a Triazine Polycarboxylate Skeleton: Multifunctional Identify and Microdetecting of the Aromatic Diamine Family (o,m,p-Phenylenediamine) Based on the Luminescent Response

Abstract

Organic aromatic amines are widely used in various fields such as pharmaceuticals, pesticides, dyes, and tobacco smoke. The pollution of organic amines has become a problem that cannot be ignored, due to the extensive harmful effects on the environment and public health, which has become one of the most concerned frontier fields in the world. Identifying and microdetecting o-phenylenediamine (OPD), m-phenylenediamine (MPD), and p-phenylenediamine (PPD) using MOFs have rarely been reported. On the basis of the blue emission properties of Cu-TBDA constructed with 5,5′-((6-chloro-1,3,5-triazine-2,4-diyl)­bis­(azanediyl))­diisophthalic acid (H4TBDA) ligand, Cu-TBDA was studied primarily to identify and detect aromatic diamine family as a multifunctional chemical sensor. Interestingly, Cu-TBDA has a very high selectivity and sensitivity to OPD and MPD with a low limit of detection (5.00 μM for OPD and 1.77 μM for MPD). Especially for OPD, Cu-TBDA has a unique switching function for it. When the concentration of OPD is less than 9.1 × 10–4 M, the fluorescence response of Cu-TBDA suspension exhibit enhanced. However, when the concentration of OPD is more than 9.1 × 10–4 M, the emission intensity displays quenching phenomenon. Therefore, Cu-TBDA as a chemical sensor not only has recognition and detection functions for organic aromatic amines but also first exhibits turn-on and -off sensing behavior toward OPD.

Structural Characteristics and Environmental Applications of Covalent Organic Frameworks

“…The exfoliated COF nanosheets of TpBDH and TfpBDH showed excellent "turn-on" and "turn-off" effects in solid and dispersed states, respectively. Similarly, COFs have been reported for the detection of ammonia [122], nitroaromatic explosives [123][124][125], Cu 2+ [126], picric acid [127], gallic acid (GA) and uric acid (UA) [128], levodopa content in human urine and blood serum samples [129], etc.…”

Cu(ii) and Zn(ii) frameworks constructed by directional tuning of diverse substituted groups on a triazine skeleton and supermassive adsorption behavior for iodine and dyes

“…† The synthesis of ligand 5,5′-((6-chloro-1,3,5triazine-3,4-diyl)bis(azanediyl)) tetra-carboxylic diisophthalic acid (H 4 TBDA-Cl) was referenced from the literature for the preparation. 31 The detailed molecular structures of HTBDA-N and TBDA-H is provided in the ESI. † After stirring for 1 h, the solution was transferred to a 20 mL Pyrex heat-resistant flask, that was heated at 120 °C for three days, and cooled slowly at 25 °C for one day, the colorless strip-shaped transparent crystals were obtained.…”

“…In addition, studies on the synthesis, structure, and properties of MOFs with the triazine tetratopic carboxylate ligand are rarer than those on triazine tricarboxylate and six carboxylates. [31][32][33] It is worth noting that for the C-Cl bond on the triazine ring of the ligand is easily substituted in the situ reaction. To explore the effect of different substituents of the triazine skeleton on the adsorption capacity, we tried to synthesize a series of MOFs containing different substituents.…”

Construction of a Supramolecular Fluorescence Sensor from Water‐soluble Pillar[5]arene and 1‐Naphthol for Recognition of Metal Ions

“…The selective monitoring of metal ions is very significant because they play a crucial role in biological systems and in the environment [1–10] . Iron is the most abundant transition metal in the human body and exists in two biologically related oxidation states: Fe 2+ and Fe 3+ .…”

“…The selective monitoring of metal ions is very significant because they play a crucial role in biological systems and in the environment. [1][2][3][4][5][6][7][8][9][10] Iron is the most abundant transition metal in the human body and exists in two biologically related oxidation states: Fe 2 + and Fe 3 + . Fe 3 + is an essential element in the human body, [11][12][13][14] and is central to hemoglobin, myosin and many cofactors involved in enzyme activity.…”