Combined experimental powder x-ray diffraction and DFT data to obtain the lowest energy molecular conformation of friedelin.

Resumo
Friedelin molecular conformers were obtained by Density Functional Theory (DFT) and by ab initio structure determination from powder X-ray diffraction. Their conformers with the five rings in chair-chair-chair-boat-boat, and with all rings in chair, are energy degenerated in gas-phase according to DFT results. The powder diffraction data reveals that rings A, B and C of friedelin are in chair, and rings D and E in boat-boat, conformation. The high correlation values among powder diffraction data, DFT and reported single-crystal data indicate that the use of conventional X-ray diffractometer can be applied in routine laboratory analysis in the absence of a single-crystal diffractometer.
Descrição
Palavras-chave
Powder X-ray diffraction, Conformational study, Friedelin
Citação
OLIVEIRA, D. M. et al. Combined experimental powder x-ray diffraction and DFT data to obtain the lowest energy molecular conformation of friedelin. Química Nova, v. 35, p. 1916, 2012. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422012001000005>. Acesso em: 20 ago. 2014.