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Relevant academic research and scientific papers

Arylation of Click Triazoles with Diaryliodonium Salts

A robust, selective, and highly efficient method for the preparation of 1,3,4-triaryl 1,2,3-triazolium salts has been developed. It features arylation of a click triazole with a diaryliodonium salt in the presence of a copper catalyst under neat condition

Novel dichloro(bis{2-[1-(4-methylphenyl)-1H-1,2,3-triazol-4-yl-κN3]pyridine-κN})metal(II) coordination compounds of seven transition metals (Mn, Fe, Co, Ni, Cu, Zn and Cd)

The synthesis, characterization, DFT and, in two cases, the structure of seven novel dichloro(bis{2-[1-(4-methylphenyl)-1H-1,2,3-triazol-4-yl-κN3]pyridine-κN})metal(II) coordination compounds ([M(L2)2Cl2]), containing transition metals of groups 7–12, are described. Both experimentally measured magnetic moment and DFT calculations showed that d5 Mn(II) (with μeff = 5.62 B.M., S = 5/2), d6 Fe(II) (with μeff = 5.26 B.M., S = 2), d7 Co(II) (with μeff = 3.98 B.M., S = 3/2), d8 Ni(II) (with μeff = 3.00 B.M., S = 1) and d9 Cu(II) (with μeff = 1.70 B.M., S = ?) are all paramagnetic, while d10 Zn(II) and Cd(II) are diamagnetic with S = 0. DFT calculations on the possible isomers of these coordination compounds, showed that the cis–cis–trans and the trans–trans–trans isomers, with the pyridyl groups trans to each other, are the lowest in energy. The trans–trans–trans isomers were experimentally characterized by X-ray crystallography for [Ni(L2)2Cl2] and [Zn(L2)2Cl2]·L2 in this study. In the solid state the coordination compounds are connected by intermolecular hydrogen bonds, mainly involving the chloride atoms, to form 3D supramolecular structures. Computational chemistry calculations, using Natural Bonding Orbital calculations, identified these inter-molecular hydrogen bonds, C–H?Cl, by a donor–acceptor interaction from a filled lone pair NBO on Cl to an empty antibonding NBO on (C–H). The inter-molecular hydrogen bonds were also identified by QTAIM determined bonding paths between Cl and the respective hydrogen. The theoretically calculated computational chemistry results thus give an understanding on a molecular level why in the solid state where inter-molecular forces and packing play a role, the trans–trans–trans isomers are mostly obtained.

Rhenium Complexes Based on 2-Pyridyl-1,2,3-triazole Ligands: A New Class of CO2 Reduction Catalysts

A series of [Re(N^N)(CO)3(X)] (N^N = diimine and X = halide) complexes based on 4-(2-pyridyl)-1,2,3-triazole (pyta) and 1-(2-pyridyl)-1,2,3-triazole (tapy) diimine ligands have been prepared and electrochemically characterized. The first ligand

Synthesis and NMR analysis of 1,4-disubstituted 1,2,3-triazoles tethered to pyridine, pyrimidine, and pyrazine rings

A combinatorial modular approach based on the "click" copper(I)-catalysed azide-alkyne cycloaddition reaction was used to prepare a library of selected 1,4-disubstituted 1,2,3-triazoles differently functionalized with heteroaryl groups including pyridine,

An efficient, one-pot, regioselective synthesis of 1,4-Diaryl-1 H -1,2,3-triazoles using click chemistry

An efficient, one-pot, regioselective synthesis of 1,4-diaryl-1H-1,2,3- triazoles is described via the copper(I)-catalyzed reaction of diaryliodonium salts, sodium azide and terminal alkynes. The generality of this protocol is demonstrated by the synthesis of a series of 1,4-diaryl-1H-1,2,3-triazoles in good to high yields. The catalyst and reaction solvent are reused without any appreciable reduction in product yield. Georg Thieme Verlag Stuttgart - New York.