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A salamo-salen-salamo hybrid fluorescent chemical sensor (H 4 L) was synthesized and characterized. It exhibits high selectivity and sensitivity to Zn2+ in physiological pH range. Meanwhile, its Zn(II) complex (L-Zn2+) continuously responses phosphate anions in DMF/H 2 O (v/v, 9:1) solution. The sensing mechanisms of H 4 L and L-Zn2+ towards Zn2+ and phosphate anions were investigated by ESI-mass spectrometry, FT-IR spectra and Spectroscopic analyses to further understand experimental consideration results observed. [Display omitted] • H 4 L is a novel salamo-salen-salamo hybrid compound. • H 4 L is a Relay-Sensor for high sensitive and selective detection of Zn2+/phosphate anions. • A detection strategy based on fluorescence enhancement effect on Zn2+ and continuous fluorescence quenching on phosphate ions was developed. • Both of the H 4 L and L-Zn2+ chemosensors have a certain practical application value and advantage. A salamo-salen-salamo hybrid fluorescent chemical sensor (H 4 L) was synthesized and characterized. It exhibits high selectivity and sensitivity to Zn2+ in physiological pH range. Meanwhile, its zinc(II) complex (L-Zn2+) continuously responses phosphate anions in DMF/H 2 O (v/v, 9:1) solution. Moreover, the identification processes are explored using characterization methods such as UV-absorption spectra, IR spectra and ESI-MS spectrum. In addition, the coordination mechanism of H 2 PO 4 − and Zn2+ were successfully exploited to make the chemical sensor reproducible. In short, the sensors H 4 L and L-Zn2+ will be promising detection devices for Zn2+ and phosphate anions. [ABSTRACT FROM AUTHOR]

[Display omitted] • The probe H 3 L was synthesized with a simple and easily accessible preparation. • H 3 L identifies B 4 O 7 2- by dual fluorescence and colorimetric channels. • The identification possesses high selectivity, fast response and low detection limit. • Good results were obtained in both bean sprout imaging and actual water sample testing. A bis(salamo)-like chemical sensor H 3 L ((1 E ,3 E)-2-hydroxy-5-methylisophthalaldehyde O , O -di(3-((((E)-(2-hydroxynaphthalen-1-yl)methylene)amino)oxy)propyl) dioxime) was constructed. H 3 L is capable of recognizing B 4 O 7 2- in H 2 O/DMF (1:9, v/v) solution by both fluorescent and colorimetric channels, bright green fluorescence was turned on when B 4 O 7 2- was added to H 3 L and changed from colorless to yellow in natural light. The detection limit was 3.21 × 10−8 M. The identification has good anti-interfering ability, quickly responsive time (5 S) and broad pH detecting range (pH = 5–12). The mechanism of action was determined by 1H NMR titration, infrared spectrometry, HRMS spectra and further elucidated by theory calculations. The fluorescence imaging of bean sprouts and spiked recovery assays of actual water samples demonstrated the practical use of sensor H 3 L for the detection of B 4 O 7 2−, which is expected to have applications for the detection of B 4 O 7 2− in plants and the environment. [ABSTRACT FROM AUTHOR]

A new salamo-like fluorescent chemosensor H 2 L was synthesized, which can selectively recognize Cu2+ and B 4 O 7 2− ions. The sensing mechanism of the sensor was studied through the relevant experiments. The H 2 L sensor's good biocompatibility and excellent water solubility make it very advantageous in practical applications, the sensor H 2 L powder can be used for fingerprint visualization, it can also be loaded on portable test paper for ion detection, and the mixture of the sensor H 2 L and B 4 O 7 2− ions can be used as ink to print safety information. [Display omitted] • A salamo-like fluorescence sensor H 2 L was designed and synthesized. • The sensor H 2 L can selectively recognize Cu2+ and B 4 O 7 2−. • The sensor H 2 L powder can be used for fingerprint visualization. • The mixture of H 2 L and B 4 O 7 2− ions can be used as ink to print safety information. • H 2 L can be loaded on a portable test strip for actual testing of Cu2+ and B 4 O 7 2−. An innovative salamo-like fluorescent chemical sensor H 2 L , has been prepared that can be utilized to selectively detect Cu2+ and B 4 O 7 2− ions. Cu2+ ions can bind to oxime state nitrogen and phenol state oxygen atoms in the chemosensor H 2 L , triggering the LMCT effect leading to fluorescence enhancement. The crystal structure of the copper(II) complex, named as [Cu(L)], has been achieved via X-ray crystallography, and the sensing mechanism has been confirmed by further theoretical calculations with DFT. Besides, the sensor H 2 L recognizes B 4 O 7 2− ions causing an ICT effect resulting in bright blue fluorescence. Moreover, the sensor has relatively high selectivity and sensitivity for Cu2+ and B 4 O 7 2− ions, and the detection limits are 1.02 × 10−7 and 2.06 × 10−7 M, respectively. In addition, the good biocompatibility and excellent water solubility of the sensor H 2 L make it very advantageous in practical applications, using H 2 L powder for fingerprint visualization, using H 2 L to identify the phenomenon of B 4 O 7 2− ions emitting bright blue fluorescence, making it an ink that can print encrypted messages on A4 paper, in addition to this, based on H 2 L , the real water sample was tested for Cu2+ ion recognition, and finally the test strip experiment was carried out. [ABSTRACT FROM AUTHOR]

Designed and synthesized a bis(salamo)-like fluorescent chemical sensor BS , which can be used as a highly selective and sensitive fluorescent probe for HCO 3 – and CO 3 2– detection. The sensing mechanism was investigated and the application of the sensor in practice was explored. In the field of ion detection, salamo-like chemical sensors have been less studied compared to other sensor molecules, especially for the recognition and detection of anions. Therefore, this study will to some extent contribute to expanding the application of salamo-like compounds. [Display omitted] • A bis(salamo)-like fluorescent sensor BS was designed and synthesized. • Sensor BS enables selective identification of HCO 3 – and CO 3 2– based on "turn-on" fluorescence. • Sensor BS is capable of being loaded on portable test strips for the practical testing of HCO 3 – and CO 3 2–. In this work, we successfully designed and synthesized a methoxydisubstituted bis(salamo)-type fluorescent chemical sensor BS , which can be applied as a highly sensitive and selective fluorescence probe for HCO 3 – and CO 3 2– detection. The LODs of HCO 3 – and CO 3 2– were experimentally calculated to be 5.4068 × 10−8 M and 4.4517 × 10−8 M, respectively. After relevant experiments, the sensing mechanism was investigated. Moreover, the application of the sensor in practice is explored, and the sensor BS can be loaded on portable test strips for ion detection. In the field of ion detection, salamo-like chemical sensors have been less studied compared to other sensor molecules, especially for the recognition and detection of anions. Therefore, this study will to some extent contribute to expanding the application of salamo-like compounds. [ABSTRACT FROM AUTHOR]

Two novel single-armed nitrogen-heterocyclic salamo-based fluorescent sensors with similar structures that can recognize Al3+ and CN− in aqueous systems, PDNS and PZNS, emit bright green–blue fluorescence in combination with Al3+ under a 365 nm UV light source and have detection limits as low as 6.25 × 10−9 and 1.26 × 10−9 mol·dm−3, respectively. [Display omitted] • Two nitrogen-heterocyclic chemosensors are investigated for recognition of Al3+. • Sensor PZNS can also recognition of CN−. • Sensor PZNS can work in a solution with 95% water content. • Nitrogen heterocycles were introduced into salamo-based molecules. • The identification mechanism are elaborated by 1HNMR, MS, and DFT. Two novel single-armed nitrogen-heterocyclic chemosensors with basically similar structures, PDNS and PZNS , were synthesized to specifically identify Al3+ in DMS:H 2 O (1:1 v/v) solution by fluorescence emission spectroscopy, and the colour of PDNS and PZNS changed from yellow to colorless when Al3+ was added under daylight. This is the first time that nitrogen-heterocyclic is introduced into salamo-based chemical sensor. At excitation wavelengths of 361 and 365 nm, solutions of PDNS and PZNS changed to intense green–blue fluorescence. Furthermore, it was found that PDNS / PZNS and Al3+ have excellent binding capacity, the lower limit of detection (LOD = 6.25 × 10−9/1.26 × 10−9 mol·dm−3) is also calculated. In addition, sensor PZNS can detect Al3+ in a solution system with up to 95% water content and applicable pH range is 3–12. Compared to other salamo-based sensors, PZNS and PDNS have broader detection conditions and wider utilities. PZNS can also identify CN− in fluorescence spectrum. PZNS can be used for detection of Al3+ in aqueous systems in daily production and life. [ABSTRACT FROM AUTHOR]

A new sensor H 5 L for continuous identification of Cu2+, Al3+ and lysine was synthesized by Schiff base reactions. The sensor could specifically recognized Cu2+ in the EtOH/H 2 O (1:1 v /v) solution by UV–vis spectra, and the binding constant with Cu2+ can reach 1011 M−1, meanwhile, it was found by the naked-eye that the color of the solution was changed from colorless to yellow. The copper complex L-Cu 2+ formed by the sensor H 5 L and Cu2+ could further recognize Al3+ and lysine in the fluorescence spectra. The LOD values of the three objects were 2.67 × 10−8, 1.96 × 10−8 and 5.59 × 10−9 M, respectively. In addition, fluorescence intracellular images of Al3+ and lysine were performed and obtained satisfactory results. A novel salamo-like chemical sensor H 5 L for continuous recognition of Cu2+ and Al3+ and lysine was synthesized. The sensor can identify Cu2+ by UV–vis spectra and naked eye recognition. The formed copper(II) complex L-Cu 2+ can recognize Al3+ and lysine by fluorescence spectra, and good results of intracellular images were obtained. Unlabelled Image • A new bis(salamo)-based chemical sensor H 5 L for continuous recognition of Cu2+, Al3+ and lysine was synthesized. • H 5 L could recognize Cu2+ by UV-visible spectrum and naked eye, and the RGB analysis was obtained good results. • The confocal fluorescence imaging of Al3+ and lysine gained favorable results. [ABSTRACT FROM AUTHOR]