C-H center dot center dot center dot O hydrogen bonding in 4-phenyl-benzaldehyde: A comprehensive crystallographic, spectroscopic and computational study

resumo

The crystal structure of 4-phenyl-benzaldehyde reveals the presence of a dimer linked by the C=O and C( 9)-H groups of adjacent molecules. In the liquid phase, the presence of C-(HO)-O-... bonded forms is revealed by both vibrational and NMR spectroscopy. A Delta H value of - 8.2 +/- 0.5 kJ mol(-1) for the dimerisation equilibrium is established from the temperature-dependent intensities of the bands assigned to the carbonyl-stretching modes. The NMR data suggest the preferential engagement of the C(2,6)-H and C(10/12)/C(11)-H groups as hydrogen bond donors, instead of the C(9)-H group. While ab initio calculations for the isolated dimers are unable to corroborate these NMR results, the radial distribution functions obtained from molecular dynamics simulations show a preference for C(2,6)-H and C(10/12)/C(11)-(HO)-O-... contacts relative to the C(9)-(HO)-O-... ones.

palavras-chave

AB-INITIO CALCULATIONS; VIBRATIONAL SPECTROSCOPY; BONDED DIMERS; NMR; BIPHENYL; DERIVATIVES; BEHAVIOR; BARRIER; FIELD

categoria

Chemistry; Physics

autores

Vaz, PD; Nolasco, M; Fonseca, N; Amado, AM; da Costa, AMA; Felix, V; Drew, MGB; Goodfellow, BJ; Ribeiro-Claro, PJA

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