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Formaldehyde (HCHO) is a common chemical raw material that is toxic and harmful in nature. Excessive HCHO content has extremely significant effects on the atmospheric environment and human health. To this end, herein, we report a 1H-[1,2,3]triazole[4,5-b]phenazine (PHTA) probe that is capable of sensing HCHO via a rapid change in its fluorescence color or intensity in the presence of the gas and solution. PHTA was directly loaded on a silica gel plate to make a portable solid sensor HCHO kit, which achieves the sensitive and selective detection of gaseous and liquid HCHO. Whether as a solid or liquid sensor for HCHO, PHTA allows for safer and more convenient use compared to other sensors. 1H-[1,2,3]triazole[4,5-b]phenazine, Fluorescent sensor, VOCs, Formaldehyde detection. [ABSTRACT FROM AUTHOR]

Since the growing importance of phenazine derivatives, the efficient synthetic strategies for the preparation of phenazine derivatives have attracted great attention from organic methodology. Herein, we comprehensively review and summarize a series of sustainable and facile synthetic strategies of phenazine derivatives. Moreover, we further discuss the approach of preparation and the superiority of each strategy. [ABSTRACT FROM AUTHOR]

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Selective monitoring and targeted identification of various noxious ions have received significant attention in biology, industry and environments. Herein, we developed an easily available colorimetric and fluorescence sensor (PZ) based on phenazine derivative, successfully achieving the discriminative detection of Hg2+ and CN− ions. Compared with other interfering ions, PZ had high sensitivity and specificity towards Hg2+ and CN−. The lowest limits of Hg2+ and CN- by PZ were 1.52 × 10−8 M and 7.05 × 10−7 M, respectively. Significantly, this chemosensor PZ allowed visual monitoring of toxic Hg2+ and CN− ions in a few seconds, presenting a great potential in the practical application (skin-whitening cosmetic, water samples, and nutlet). Such an effective strategy is expected to offer some guidance for distinguishing the identification of toxic ions in optical sensing. [ABSTRACT FROM AUTHOR]

A material that can simultaneously detect and remove toxic heavy metal Hg2+ ions are still needed in urgent. Herein, we report that an efficient, simple and water‐soluble phenazine hydrochloride (DAPH) chemosensor for colorimetric and fluorogenic detection of Hg2+ in pure water. The fluorescent and UV‐vis detection limits for Hg2+ are low. Meanwhile, the chemosensor is able to effectively remove Hg2+ in pure water through inductively coupled plasma (ICP) analysis. A series of experimental results showed that the chemosensor successfully used to real‐time detect and remove toxic heavy metal Hg2+ ions from water via a simple deprotonation and destroyed phenazine‐based hydrochloride π−π stacking interactions. In addition, the fabricated silica gel plates are also demonstrated excellent selectivity towards Hg2+ ion without interfering. [ABSTRACT FROM AUTHOR]

Two kinds of fluorescent sensors (G 1 and G 2 ) for Fe 3+ bearing 1H -imidazo [4,5-b] phenazine derivatives have been designed and synthesized. G 1 can display ON-OFF-type fluorescence charged with high selectivity and sensitivity toward Fe 3+ in DMSO solutions. And other cations, including Hg 2+ , Ag + , Ca 2+ , Co 2+ , Ni 2+ , Cd 2+ , Pb 2+ , Zn 2+ , Cr 3+ , and Mg 2+ had no influence on the probing behavior. The detection limit of the sensor G 1 towards Fe 3+ is 2.860 × 10 −7 M. Once combined with Fe 3+ , G 1 displayed high specificity for H 2 PO 4 − . Furthermore, in the situ generated G 1 –Fe 3+ ensemble could recover the enhanced fluorescence upon the addition of H 2 PO 4 − resulting in an ON-OFF-ON sensing with a detection limit of 1.866 × 10 −7 M in the same medium. Notably, this sensor serves as a recyclable component in sensing materials. The reversibility and selectivity of G 1 /G 1 + Fe 3+ toward Fe 3+ /H 2 PO 4 − ions as a sequence dependent molecular keypad lock using the G 1 , Fe 3+ and H 2 PO 4 − as three different chemical inputs. In addition, the test strip based on G 1 was fabricated, which could act as a convenient and efficient Fe 3+ test kit. [ABSTRACT FROM AUTHOR]

Highlights: [•] We synthesized a novel sensor was never reported and explored the interaction of the sensor and Fe3+ by MS, XRD and IR. [•] The fluorescence revealed that receptor S is an excellent sensor in the recognition to Fe3+ (very few reported) selectively. [•] The test strips were containing S were fabricated, which also shows a highly sensitively to Fe3+. [Copyright &y& Elsevier]

In this work, a new phenazine-based derivative ( L-1 ) which based on 2,3-diamino-phenazine and 5-(4-chlorphenyl)-2-furaldehyde was designed to act efficiently in a chemodosimeter approach for the rapid and selective detection of silver ion in aqueous solution over a wide pH range. The addition of Ag + to an aqueous solution of L-1 induced a change in the solution color from yellow to shallow orange and fluorescent quenching, indicating that L-1 could act as an excellent ON−OFF-type fluorescent chemosensor for Ag + . With a detection limit of 3.25 × 10 −7 M, the chemosensor shows great potential to monitor Ag + in environmental analysis systems. Furthermore, this sensor can serve as a recyclable component in sensing materials. These properties make L-1 act as an accurate Ag + controlled ON−OFF−ON fluorescence switch and implication (IMP) function logic gate. In addition, the actual usage of sensor L-1 was further demonstrated by test kits and silica gel plates. Notably, the stoichiometry of the complexes between the sensor and Ag + is indicative of a 2:1 ratio which was determined by a Job's plot yielded from fluorescence titrations. And the mode of interaction between Ag + ions and L-1 has been supported by 1 H NMR spectroscopy and mass spectrometry studies. [ABSTRACT FROM AUTHOR]

• A novel biogenic amine-responsive platform (P-N) based on self-assembly property of phenazine derivative was fabricated. • The prominent characteristics revealed that the P-N could not only present strong AIE effect, but also endow excellent sensing properties of the multiphase examining. • Those observations demonstrated the P-N exhibited high sensitivity to amine and yielded an excellent proof-of-concept smart label in supervising the meat spoilage. • Such a novel fabrication strategy is expected to offer some guidance to develop various smart food packaging label for examining food freshness. Smart label serving as a response to a particular stimulus (e.g., biogenic amines) endow great potential to monitor the storage conditions and food freshness. Therefore, the development of smart food packaging for supervising the degree of food decay in real-time is of great importance in food safety. To this endeavor, herein we successfully fabricated a novel biogenic amine-responsive platform (P-N) based on supramolecular host-guest interaction, exploiting self-assembly properties of phenazine derivatives (PY) and naphthalene diamide (NDI) induced by hydrogen bond. Taking advantage of this feature, we investigated the prominent performance of this biogenic amine-responsive platform (P-N), involving in feasible fabrication pathway, specific response to biogenic amine, persistent stability and further application as a smart label for motoring meat spoilage. Those observations demonstrated that the P-N could self-assembly into well-organized rodlike structure showing strong AIE effect, not only exhibiting high sensitivity and great potential in the practical application, but also yielding an excellent proof-of-concept smart label in supervising the meat spoilage. Such a novel fabrication strategy is expected to provide some guidance to develop various smart food packaging label for motoring food freshness. [ABSTRACT FROM AUTHOR]

Taking advantages of both the well-known phenazine structure and the mechanism of the supramolecular self-assembly and deprotonation process, the fluorescent and colorimetric sensor ( ZL ) was designed and synthesized, behaving as a circulation utilization (above 10 times) receptor for selective detection of cyanide anion (CN − ) in aqueous media. Upon the addition of CN − , the sensor displayed obvious color changes from yellow to jacinth by naked eyes and the fluorescence immediately quenched (< 10 s). With respect to other common anions, the sensor possessed high selectivity and sensitivity (0.05 μM) for cyanide anions. In addition, the test strips of ZL were fabricated, which could serve as practical colorimetric and fluorescent sensor for “in-the-field” measurements. [ABSTRACT FROM AUTHOR]

A turn-on fluorescent chemosensor ( H - 1 ) for cyanide anions based on dihydroxy phenazine was designed and synthesised. The sensor H - 1 exhibits high sensitivity and good selectivity for cyanide in pure water. The CN − response mechanism involves a hydrogen bonding and deprotonation process in the sensor, which induced prominent fluorescence enhancement. The detection limit of the sensor toward CN − is 5.65 × 10 −7 M, and other anions had nearly no influence on the probing behavior. In addition, test strips based on the sensor were fabricated, which also exhibit a good selectivity to CN − in water. Notably, this sensor was successfully applied to detect CN − in food samples, which proves a very simple and selective platform for on-site monitoring of CN − in agriculture samples. [ABSTRACT FROM AUTHOR]

Here, we reacted 2,3-Diaminophenazine with salicylaldehyde to generate dye molecule 2-Hydroyphenyl-(1 H -imidazo[4,5-b]phenazine(P1). The crystal structure displayed that P1 and DMSO molecule formed 2D supramolecular layered structure through non-covalent weak interactions. More importantly, the dye molecule P1 had excellent selectivity and sensitivity to Fe3+ and Cu2+, and detection limits from fluorescence data were found to be 3.25×10-7 M and 1.25×10-7 M, respectively. The complex P1-Fe3+ can also further detect H 2 PO 4 -. In addition, P1-I- (I-=F- and AcO-) can be used as an excellent ligand for Ag+ removal. According to ICP data, the removal rate of Ag+ by dye molecules P1-I- reached 94.91% and 96.00%, respectively. [Display omitted] • Dye molecule P1 and DMSO form a 2D supramolecular layered structure through a variety of non-covalent weak interactions. • The dye molecule P1 can effectively detect Fe3+ and Cu2+, and the complex P1-Fe3+ can further detect H 2 PO 4 −. • P1-I- (I-=F- and AcO-) can effectively remove Ag+, and the removal rate reaches 94.91% and 96.00%. • P1 can quickly and easily detect Fe3+ and Cu2+, and can make a low cost, high efficiency detection kit for Fe3+ and Cu2+. Application of dye molecules to detect and remove heavy metal ions in a variety of complex systems often poses significant challenge. Here we have developed a fast, low-cost phenazine based dye 2-Hydroyphenyl-(1 H -imidazo[4,5-b]phenazine(P1) for fluorescence detecting Fe3+, Cu2+ and removing Ag+ from solution by colorimetry. The crystal structure e xhibited that P1 and DMSO molecules assemble into dimer through intermolecular hydrogen bonds. P1 can detect Fe3+ and Cu2+ by fluorescent change, the detection limit(LOD) of P1 for Fe3+ and Cu2+ were calculated as 3.25 × 10-7 M and 1.25 × 10-7 M, respectively. The complex P1-Fe3+ showed high selectivity and quick fluorescence turn on response for H 2 PO 4 -. In addition, P1-I - (I- =F- and AcO-)has a greatly brilliant to remove Ag+. The removal rates could be reached to 94.91% and 96.00%, respectively. [ABSTRACT FROM AUTHOR]

The development of new strategies for the construction of highly selective and stable vapochromic system is still in great demand. Here, we present a highly selective and stable vapochromic system constructed by pillar[5]arene-based host–guest interactions between a pillar[5]arene (EtP5) and a phenazine derivative. The present material in this work showed specific selective responsiveness to chloroform vapor. The resultant dark orange solid sample was highly stable, which can maintain the color in air for at least two months at room temperature. Moreover, CHCl 3 vapor responsive thin film and light-emitting diode (LED) was successfully prepared by coating the EtP5⊃1 complex on a glass sheet and a commercially available UV-LED. This work provided a new approach for the design and construction of selective and stable vapochromic systems with obvious color changes using pillar[5]arene-based host–guest interactions. • A new approach for the design and construction of vapochromic systems. • The present material showed specific selective responsiveness to CHCl 3. • The resultant dark orange solid material was highly stable. [ABSTRACT FROM AUTHOR]