Synthesis, Conformational Analysis, Infrared, Raman and UV-Visible Spectra of novel Schiff bases compiled with DFT calculations.

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ID: 91071
2020
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Abstract
Two novel Schiff bases named, 2-((2-Hydroxybenzylidene)amino)-4,5,6,7-tetrahydrobenzo[b] thiophene-3-carbonitrile (BESB1) and 2-((Furan-2-ylmethylene)amino)-4,5,6,7-tetrahydro-benzo[b]thiophene-3-carbonitrile (BESB2) were synthesized.The structures were characterized based on CHN elemental analysis, mid-infrared (400-4000 cm-1), Raman (100-4000 cm-1), 1H NMR, mass and UV-Vis spectroscopic measurements. In addition, quantum mechanical calculations using DFT-B3LYP method at 6-31G(d) basis set were carried out for both Schiff bases. Initially, we have carried out complete geometry optimizations followed by frequency calculations for the proposed conformational isomers; BESB1 (A-E) and BESB2 (F-J) based on the orientations of both CN and OH groups against the azomethine lone-pair (NLP) in addition to the 3D assumption.The computational outcomes favors conformer A for BESB1 in which the CΞN and OH moieties are cis towards the NLP while conformer G is preferred for BESB2 (the CΞN/furan-O are cis/trans towards the NLP) which found consistent with the results of relaxed potential energy surface scan. Aided by normal coordinate analysis of the Cartesian coordinate displacements, we have suggested reliable vibrational assignments for all observed IR and Raman bands. Moreover, the electronic absorption spectra for the favored conformers were predicted in DMSO solution using TD- B3LYP/6-31G(d) calculations. Similarly, the 1H NMR chemical shifts were also estimated using GIAO approach implementing (PCM) including solvent effects (DMSO-d6).Therefore, a proper interpretation of the observed electronic transition and chemical shifts were presented in this study.
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ahmed2020synthesiscombinatorial Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ahmed, Samy M;Shaaban, Ibrahim A;El-Mossalamy, E H;Mohamed, Tarek A;
Journal combinatorial chemistry & high throughput screening
Year 2020
DOI
10.2174/1386207323666200127161207
URL
Keywords
dft calculations infrared raman and nmr spectra thiophene azomethine derivatives vibrational assignment

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