Portal de Periódicos da CAPES

The Crystal Structure of Bis[4-(5′-carboxylpentyloxy)acetophenon]azine

1990; Taylor & Francis; Volume: 185; Issue: 1 Linguagem: Inglês

10.1080/00268949008038493

1044-1859

Roberto Centore, M. R. Ciajolo, Antonio Roviello, Augusto Sirigu, Angela Tuzi,

Lanthanide and Transition Metal Complexes

Abstract Bis[4-(5′-carboxylpentyloxy)acetophenon]azine, C28H36N2O6, is a dicarboxylic acid containing a mesogenic core. It has been taken into account as a model compound for main chain liquid crystalline polymers containing mesogenic groups and flexible spacers in alternating sequence. The crystal and molecular structure has been determined, at room temperature, by direct methods. Crystals belong to the triclinic system, space group P1, a = 6.519(2)Å, b = 7.665(2)Å, c = 26.215(7)Å, α = 91.97(2)°, β = 93.70(2)°, γ = 84.77(2)°, with two molecules per unit cell. The structure was refined, by full matrix least squares method, to R = 0.064 for 2679 observed independent reflections, having I > 3[sgrave](I). Molecules are bonded along extended rows through hydrogen bonds between carboxylic groups. The conformation around the central =N-N= bond of the crystallographic independent molecule is not fully transplanar and the phenyl rings belonging to a molecule are twisted with respect to each other, their average planes making a dihedral angle of 63.8(1)°.