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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]

A novel Salamo-Salen-Salamo-Zn(II) complex fluorescent sensor ZT was successfully synthesized, and exhibited fluorescent quenching effect and excellent applicability through solid-state fluorescent strips and biological imaging experiments on zebrafish and bean sprout to highly sensitive monitoring H 2 PO 4 - ions. [Display omitted] • A novel and effective Salamo-Salen-Salamo-Zn fluorescent sensor ZT was successfully developed. • It is worth noting that ZT serves as a fluorescence ON-OFF sensor by adding H 2 PO 4 - in the presence of excess other anions. • The sensor ZT was successfully studied using the solid-state fluorescence of the test strips. • Bioimaging experiments were conducted on zebrafish and bean sprouts using a confocal microscope. A newly designed and synthesized Salamo-Salen-Salamo-Zn(II) complex sensor (sensor ZT) was extensively explored for anion sensing studies. The selectivity and sensitivity of the sensor ZT towards H 2 PO 4 - ions were based on ICT and CHEF effects, and via displacement pathways in DMSO/H 2 O (9:1, v/v) medium in the presence of other anions like, PO 4 3-, HPO 4 2- and P 2 O 7 4- in a short time, separately. The prepared ZT sensor has excellent association constant and low detection lines. The sensing mechanism and binding mode of the sensor were studied by UV–Vis spectroscopy, HR-MS, 1H NMR titration and theory calculations (DFT & TD-DFT) for analytes. The time response and stability of the sensor are also given. Meanwhile, the sensor ZT can be widely used as a simple and effective solid-state optical sensor to detect H 2 PO 4 - by intuitive fluorescence changes. In addition, besides the environment can be used as a powerful instrument for detecting H 2 PO 4 -, based on the good biocompatibility and tissue permeability of ZT , effectively monitoring H 2 PO 4 - in cellular distribution by confocal microscopy using Zebrafish and bean sprout. [ABSTRACT FROM AUTHOR]

The optical properties of a novel chemosensor for cyanide anions based on a symmetric bis(salamo)-type ligand (H 3 L) were investigated by UV–Vis and fluorescence spectroscopy in MeOH/H 2 O (1:1 v/v) solution. Sensor H 3 L can selectively sense CN − based on prominent color changes among other anions. The chemosensor exhibits an apparent fluorescence enhancement at 482 nm to CN − which because cyanide ions interact with C N bonds. Combining the corrected Benesi-Hildebrand formula, the binding constant of the formed host-guest complex was calculated as 2.42 × 10 5 M − 1 . Meanwhile, the detection limit of the sensor toward CN − was 8.91 × 10 − 7 M. It is worth noting that the designed sensor can be used for rapid detection of cyanide anions in basic pH range, and has great practical value. [ABSTRACT FROM AUTHOR]