The Synthesis of New Triazole Ligands and Determination of Complex Stability Constants with Transition Metal Cations in Aqueous Media

Ocak, Miraç; Gümrükçüoğlu, Nurhan; Ocak, Ümmühan; Buschmann, Hans‐Jürgen; Schollmeyer, Eckhard

doi:10.1007/s10953-008-9331-x

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…With the increase of 3-amino-1,2,4-triazole concentration in the 3-amino-1,2,4-triazole/GQDs/Pd 2+ system, PL intensity was recovered. This event is the consequence of the high affinity of 3-amino-1,2,4-triazole molecules toward metal ions [ 50 ]. Pd 2+ ions and 3-amino-1,2,4-triazole build the complex, which leads to the breaking of the bonds between GQDs and Pd 2+ ions and whereby their PL has been recovered.…”

Section: Resultsmentioning

confidence: 99%

Gamma-Ray-Induced Structural Transformation of GQDs towards the Improvement of Their Optical Properties, Monitoring of Selected Toxic Compounds, and Photo-Induced Effects on Bacterial Strains

et al. 2022

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Structural modification of different carbon-based nanomaterials is often necessary to improve their morphology and optical properties, particularly the incorporation of N-atoms in graphene quantum dots (GQDs). Here, a clean, simple, one-step, and eco-friendly method for N-doping of GQDs using gamma irradiation is reported. GQDs were irradiated in the presence of the different ethylenediamine (EDA) amounts (1 g, 5 g, and 10 g) and the highest % of N was detected in the presence of 10 g. N-doped GQDs emitted strong, blue photoluminescence (PL). Photoluminescence quantum yield was increased from 1.45, as obtained for non-irradiated dots, to 7.24% for those irradiated in the presence of 1 g of EDA. Modified GQDs were investigated as a PL probe for the detection of insecticide Carbofuran (2,2-Dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate) and herbicide Amitrole (3-amino-1,2,4-triazole). The limit of detection was 5.4 μmol L−1 for Carbofuran. For the first time, Amitrole was detected by GQDs in a turn-off/turn-on mechanism using Pd(II) ions as a quenching agent. First, Pd(II) ions were quenched (turn-off) PL of GQDs, while after Amitrole addition, PL was recovered linearly with Amitrole concentration (turn-on). LOD was 2.03 μmol L−1. These results suggest that modified GQDs can be used as an efficient new material for Carbofuran and Amitrole detection. Furthermore, the phototoxicity of dots was investigated on both Gram-positive and Gram-negative bacterial strains. When bacterial cells were exposed to different GQD concentrations and illuminated with light of 470 nm wavelength, the toxic effects were not observed.

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Section: Resultsmentioning

confidence: 99%

Gamma-Ray-Induced Structural Transformation of GQDs towards the Improvement of Their Optical Properties, Monitoring of Selected Toxic Compounds, and Photo-Induced Effects on Bacterial Strains

et al. 2022

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“…The cargo molecules that complex strongly with Co 2+ , e.g. 1H-benzotriazole (BTA, anticorrosion agent, more information in ESI †), which complexes with cobalt ions with stability constant (log K stab ) > 3, 30 are preferably detained in the pores of nanocontainers, resulting in the prevention of premature leakage. The reversible bonds can dissociate in response to a pH lowering due to the protonation of electron donating agents, 31,32 which enables the nanovalves to release the entrapped cargo as a feedback to the external trigger (Route 2 in Fig.…”

Section: Characterization Of Npcs-inspired Controlled Release Systemmentioning

confidence: 99%

Bioinspired nanovalves with selective permeability and pH sensitivity

et al. 2015

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Biological systems with controlled permeability and release functionality, which are among the successful examples of living beings to survive in evolution, have attracted intensive investigation and have been mimicked due to their broad spectrum of applications. We present in this work, for the first time, an example of nuclear pore complexes (NPCs)-inspired controlled release system that exhibits on-demand release of angstrom-sized molecules. We do so in a cost-effective way by stabilizing porous cobalt basic carbonates as nanovalves and realizing pH-sensitive release of entrapped subnano cargo. The proof-of-concept work also consists of the establishment of two mathematical models to explain the selective permeability of the nanovalves. Finally, gram-sized (or larger) quantities of the bio-inspired controlled release system can be synthesized through a scaling-up strategy, which opens up opportunities for controlled release of functional molecules in wider practical applications.

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Synthesis, Antibacterial, Antiurease, and Antioxidant Activities of Some New 1,2,4-Triazole Schiff Base and Amine Derivatives

Sökmen

Gümrükçüoğlu²,

Uğraş

et al. 2014

Appl Biochem Biotechnol

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The acylhydrazone compound named ethyl N'-furan-2-carbonylbenzohydrazonate was synthesized by the condensation of ethyl benzimidate hydrochloride with furan-2-carbohydrazide. The treatment of the acylhydrazone with hydrazine hydrate afforded 4-amino-3-furan-2-yl-5-phenyl-1,2,4-triazole. The usage of this compound with various aromatic aldehydes resulted in the formation of 4-arylidenamino-3-furan-2-yl-5-phenyl-1,2,4-triazoles. Sodium borohydride reduction of 4-arylidenamino derivatives afforded 4-alkylamino-3-furan-2-yl-5-phenyl-1,2,4-triazoles. The obtained products were identified by FT-IR, (1)H-NMR, (13)C-NMR. A series of compounds were evaluated for their antibacterial, antiurease, and antioxidant activities. The results showed that the synthesized new compounds had effective antiurease and antioxidant activities.

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The Synthesis of New Triazole Ligands and Determination of Complex Stability Constants with Transition Metal Cations in Aqueous Media

Cited by 5 publications

References 28 publications

Gamma-Ray-Induced Structural Transformation of GQDs towards the Improvement of Their Optical Properties, Monitoring of Selected Toxic Compounds, and Photo-Induced Effects on Bacterial Strains

Gamma-Ray-Induced Structural Transformation of GQDs towards the Improvement of Their Optical Properties, Monitoring of Selected Toxic Compounds, and Photo-Induced Effects on Bacterial Strains

Bioinspired nanovalves with selective permeability and pH sensitivity

Synthesis, Antibacterial, Antiurease, and Antioxidant Activities of Some New 1,2,4-Triazole Schiff Base and Amine Derivatives

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