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Quantum Chemical and Nuclear Magnetic Resonance Spectral Studies on Molecular Properties and Electronic Structure of Berberine and Berberrubine by A. N. Tripathi; Lata Chauhan; P. P. Thankachan; Ritu Barthwal is a Chemistry article available to read on EtoBox.

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## Abstract The structural and electronic properties of berberine and berberrubine have been studied extensively using density functional theory (DFT) employing B3LYP exchange correlation. The geometries of these molecules have been fully optimized at the B3LYP/6‐311G\*\* level. The chemical shift of ^1^H and ^13^C resonances in NMR spectra of these molecules have been calculated using the gauge invariant atomic model (GIAO) method as implemented in Gaussian 98. One‐ and two‐dimensional HSQC (^1^H^13^C), HMBC (^1^H^13^C) and ROESY (^1^H^1^H) spectra were recorded at 500 MHz for the berberine molecule in D~2~O solution. All proton and carbon resonances were unambiguously assigned, and inter‐proton distances obtained from ten observed NOE contacts. A restrained molecular dynamics (RMD) approach was used to get the optimized solution structure of berberine. The structure of berberine and berberrubine molecules was also obtained using the ROESY data available in literature. Comparison of the calculated NMR chemical shifts with the experimental values revealed that DFT methods produce very good results for both proton and carbon chemical shifts. The importance of the basis sets to th

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Author

A. N. Tripathi; Lata Chauhan; P. P. Thankachan; Ritu Barthwal

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; John Wiley and Sons Ltd; Wiley (ISSN 0749-1581)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)