Synthesis and characterization of modified Schiff base silatranes (MSBS) via ‘Click Silylation’

Design, Synthesis and Application of 1,4-disubstituted 1,2,3-triazole Based Chemosensors: A Promising Avenue

The 1,2,3-triazole-based chemosensors, synthesized through Cu(I)-catalyzed azide-alkyne cycloaddition via 'click chemistry', offer a straightforward yet highly effective method for detecting metal cations and anions with remarkable accuracy, selectivity and sensitivity, making them invaluable across various fields such as chemistry, pharmacology, environmental science and biology. The selective recognition of these ions is crucial due to their significant roles in biological and physiological processes, where even slight concentration variations can have major consequences. The article reviews literature from 2017 to 2024, highlighting advancements in the synthesis of 1,2,3-triazole-based ligands and their application (along with sensing mechanism) for detection of various ions causing health and environmental hazards. The detection aspects have been discussed sequentially for the transition-, inner transition-, and the metals from the s or p block of the periodic table.

Molecular keypad controlled circuit for Ce(iii) and NO3− ions recognition by μw synthesized silicon-embedded organic luminescent sensor

This report demonstrates the mimicking of an electronic circuit diagram towards Ce(iii) ion sensing response supported by molecular keypads. The probe naphthyl based triazole linked silatrane (NTS) was efficiently synthesized using a series of microwave mediated reactions. The luminescent sensor NTS was explored for the ion sensing response towards Ce(iii) ions using DMSO and DMSO : H₂O 4 : 1 (v/v) as solvent media, respectively. The role of water in Ce(iii) ion sensing was detected as ‘turn-off’ response that contradicts the ‘turn-on’ with DMSO. Further, the sensing of NO₃⁻ ions by NTS–Ce(iii) ensemble was associated with blue shift on absorption maxima. These mimicking response studies were sketched as circuit diagrams assisted by molecular keypad behaviour as IMPLICATION output logic gate.

This report demonstrates the mimicking of an electronic circuit diagram towards Ce(iii) ion sensing response supported by molecular keypads.

Design, synthesis of novel starch derivative bearing 1,2,3-triazolium and pyridinium and evaluation of its antifungal activity

Based on cuprous-catalyzed azide-alkyne cycloaddition (CuAAC), starch derivative bearing 1,2,3-triazole and pyridine (II) was prepared and subsequently followed by alkylation with iodomethane to synthesize starch derivative bearing 1,2,3-triazolium and pyridinium (III). The antifungal activities of starch derivatives against Colletotrichum lagenarium, Watermelon fusarium, and Phomopsis asparagi, were then assayed by hypha measurement in vitro. Apparently, starch derivatives showed enhanced antifungal activity against three fungi at the tested concentrations compared with starch. Especially, the best inhibitory index of starch derivative (III) against Colletotrichum lagenarium attained 97% above at 1.0mg/mL. Meanwhile, starch derivative (III) had stronger antifungal activity than starch derivative (II), which was reasonable to propose that the alkylation of 1,2,3-triazole and pyridine was significant for enhanced antifungal activity. As this novel starch derivative bearing 1,2,3-triazolium and pyridinium could be prepared efficiently and exhibited superduper antifungal activity, this material might provide an effective way and notion to prepare novel antifungal agents.

Synthesis, characterization, and antibacterial property of novel starch derivatives with 1,2,3-triazole

Four novel starch-linked-1,2,3-triazole derivatives were synthesized including 6-hydroxymethyltriazole-6-deoxy starch (HMTST), 6-bromomethyltriazole-6-deoxy starch (BMTST), 6-chloromethyltriazole-6-deoxy starch (CMTST), and 6-carboxyltriazole-6-deoxy starch (CBTST). Their antibacterial properties against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were evaluated in vitro, respectively. The inhibitory property of the obtained amphiprotic starch derivatives exhibited a remarkable improvement over starch. And the antibacterial indices of most of the products were higher than 60% and 40% at 1.0 mg/mL when the culture time was 8 h and 16 h, respectively. Moreover, the inhibitory index of CBTST attained 97% above at 1.0 mg/mL. Generally, the inhibitory activity decreased in the order: CBTST>CMTST>BMTST>HMTST>starch. Furthermore, the order of their antibacterial activity was consistent with the electron-withdrawing property of different substituted groups of the 1,2,3-triazole groups. The substituted groups with stronger electron withdrawing ability relatively possessed greater antibacterial activity.

Thioester-appended organosilatranes: synthetic investigations and application in the modification of magnetic silica surfaces

Thioester tethered organosilatranes were synthesized. The substituent effect on the absorption spectra and potential for binding with Cu²⁺were explored.

Heteroaryl chalcone allied triazole conjugated organosilatranes: synthesis, spectral analysis, antimicrobial screening, photophysical and theoretical investigations

A series of heteroaryl tethered triazole conjoined organosilatranes were synthesized and studied for their solvatochromism experimentally and theoretically followed by antimicrobial screening.

Organosilatranes with thioester-anchored heterocyclic ring assembly: Cu2+ ion binding and fabrication of hybrid silica nanoparticles

Thioester allied organosilatranes were synthesized by the CDI mediated coupling of carboxylic acids with mercaptopropylsilatrane. One of the silatrane was further immobilized onto silica nanospheres, characterized and tested for copper ion binding.

Chalcomer assembly of optical chemosensors for selective Cu2+ and Ni2+ ion recognition

The o-, m- and p-isomeric units of chalconyl triazole-based, caged organosilicon complexes were efficiently synthesized and explored for their cationic chemosensing activities.

Synthetic approach towards ‘click’ modified chalcone based organotriethoxysilanes; UV-Vis study

The efficient linkage of a conjugate chalcone to n-propyltriethoxysilanes via a 1,2,3-triazole is reported. The synthesis involves a Claisen–Schmidt condensation followed by a copper(i) catalyzed azide–alkyne cycloaddition (CuAAC) reaction.