Role of weak C-H...O and strong N-H...O intermolecular interactions on the high-symmetry molecular packing of trans-cyclohexane-1,4-dicarboxamide

MÁXIMO BARÓN; GUSTAVO A. ECHEVERRÍA; FERNANDO GARCÍA REYES; ROSANA M. ROMANO; FANTONI, ADOLFO CARLOS; GRACIELA M. PUNTE

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018 vol. 74 p. 1068 - 1078

0108-2701

An unpredicted fourfold screw N?H...O hydrogen bond C(4) motif in a primary dicarboxamide (trans-cyclohexane-1,4-dicarboxamide, C8H14N2O2) was investigated by single-crystal X-ray diffraction and IR and Raman spectroscopies. Electron-density topology and intermolecular energy analyses determined from ab initio calculations were employed to examine the influence of weak C?H...O hydrogen-bond interactions on the peculiar arrangement of molecules in the tetragonal P43212 space group. In addition, the way in which the co-operative effects of those weak bonds might modify their relative influence on molecular packing was estimated from cluster calculations. Based on the results, a structural model is proposed which helps to rationalize the unusual fourfold screw molecular arrangement.