T. H. Goodwin, M. Przybylska, J. Robertson
Jul 1, 1950
Citations
0
Influential Citations
59
Citations
Journal
Acta Crystallographica
Abstract
l:4-Dimethoxybenzene crystallizes in the space group Pbca with four centro-syrmnetrical molecules per unit cell. A quantitative X-ray investigation, based on visual intensity measurements of about 170 reflexions from crystallographically different planes in the axial zones, has led to a complete determination of the structure, and the results have been refined by double Fourier projections on the planes (100) and (010). The co-ordinates of all the atoms are given. The methyl groups lie in the plane of the ring, and the following bond lengths have been found: C(1)-C(2) = 1.36 A., C(2)-C(3) = 1.37 A., C(3)-C(1') = 1.44 A. (all in the benzene ring) ; C(1)-O = 1.36 A.; O-C(CHa)= 1.35 A., all _+ 0.02 A. The valency angle of oxygen is 121 ___ 2 °. Some of these results are rather unexpected, and though some brief comments are made, detailed consideration is withheld pending their confirmation by the study of other similar compounds.