Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 34803-66-2, Name is 1-(2-Pyridyl)piperazine, SMILES is N1(C2=NC=CC=C2)CCNCC1, in an article , author is Sanchez-Portillo, Paola, once mentioned of 34803-66-2, SDS of cas: 34803-66-2.
Colorimetric metal ion (II) Sensors Based on imine boronic esters functionalized with pyridine
The one-step synthesis of three imine boronic esters functionalized with pyridyl groups is described (1a-1c). The presence or absence of a methyl group affects the whole conformation, being bent L or linear as determined by X-ray crystal diffraction. C-H center dot center dot center dot O, C-H center dot center dot center dot N, C-H center dot center dot center dot F and C-H center dot center dot center dot pi hydrogen bond interactions support 2D supramolecular arrangements. Ligands were tested as metal ion (M2+) sensors in solution. The addition of metal cations (Fe2+, Co2+ and Cu2+) to 1a using methanol as solvent, showed significant color changes (purple, orange and green, respectively), while for metal cations Ni2+, Zn2+, Cd2+ cations no color changes were observed. The sensitivity of compound 1a towards Fe2+, Co2+ and Cu2+ was monitored by UV-Vis spectroscopy, where the presence of Fe2+ produces new bands at 360 and 566 nm. For Co2+ and Cu2+ a remarkable intensity increase was observed at 290 nm band and new bands appear at 340 and 462 nm, respectively. The stoichiometry of the complexes 1a-Fe2+, 1a-Co2+ and 1a-Cu2+ was determined by Job’s plots being 1:3 (metal:ligand, complex [Fe (1a)(3)](2+)), in contrast with the stoichiometry 1:1 observed for 1b-Fe2+. In fact, the computed Delta G formation associated value showed a strong stabilization for the complex [Fe (1a)(3)](2+) (-65.5 kcal/mol) in comparison with the possible complex [Fe (1b)(3)](2+) (-29.7 kcal/mol). Detection limits are in the mM range (determined by UV-Vis) and mu M range (determined by Fluorescence). An analogous bis-bidentate derivative (2a) also shows similar behavior but stoichiometric interaction changes to 2:3 (metal:ligand) and detection limits are in the mM range obtained by UV-Vis and Fluorescence techniques.
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Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem