Authors Golla, R; Kumar, PR; Suchethan, PA; Foro, S; Nagaraju, G in ELSEVIER published article about SUPRAMOLECULAR INTERACTIONS; RUTHENIUM(II) COMPLEXES; REVERSIBLE REDOX; METAL-COMPLEXES; TERPYRIDINE; LIGAND; HETEROCYCLES in [Golla, Ramesh; Kumar, P. Raghavendra; Suchethan, P. A.] Tumkur Univ, Univ Coll Sci, Dept Studies & Res Chem, Tumakuru 572103, Karnataka, India; [Foro, Sabine] Tech Univ Darmstadt, Inst Mat Sci, Petersenstr 23, D-64287 Darmstadt, Germany; [Nagaraju, G.] Siddaganga Inst Technol, Dept Chem, Tumakuru 572103, Karnataka, India in 2020.0, Cited 55.0. Recommanded Product: 2,5-Dimethoxybenzaldehyde. The Name is 2,5-Dimethoxybenzaldehyde. Through research, I have a further understanding and discovery of 93-02-7
Four new 4′-dimethoxyphenyl-(2,6-di-2-pyrazinyl) pyridines (1-4) were synthesised by a facile one-pot method using 2-acetylpyrazine and n,n’-dimethoxybanzaldehydes. All compounds (1-4) were characterised by H-1 and C-13{H-1} NMR, and FT-IR spectroscopy. The molecular structure of compounds 1, 2, and 3 was also confirmed by single crystal X-ray diffraction. There exists CH center dot center dot center dot N, CH center dot center dot center dot O and C center dot center dot center dot C aromatic stacking type of intermolecular secondary interactions which resulted into supramolecular structures in compounds 1-3. The Hirshfeld surface analysis was carried out for the confirmation of intermolecular secondary interactions. The dihedral angles between substituted dimethoxyphenyl ring (B) and central pyridine (A) and pyrazine rings (C and D) are in the range of 33-45 degrees. The photophysical properties were studied by UV-Visible and fluorescence spectroscopy and electrochemical properties by cyclic voltammetry. In the UV-Visible spectra, the compounds, 1-4 showed two strong bands at lambda(max), 236-238 and 284-293 nm attributed to the intramolecular charge transfer (pi-pi*) transitions. When these compounds were excited at 350 nm observed emission bands at lambda(em), 463, 511, 462, and 407 nm respectively. The compounds, 1-3 were showed an oxidation peak, (E-OX, 1.18, 1.57 and 1.25 V) but compound 4 showed two oxidation peaks (E-OX, 1.20 and 1.84 V). Astonishingly, only compound, 3 have shown a reduction peak at (E-red, 1.33 V) but there was no reduction peak in 1, 2 and 4. This shows that the compound, 3 undergo reversible redox reaction. (C) 2019 Elsevier B.V. All rights reserved.
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