Crystal Structure of Mesogenic Material IV-Nematogenic 4-(4′-‎Ethoxyphenylazo) Phenyl Heptanoate

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Journal Title, Volume, Page: 
Zeitschrift Fur Kristallographie Volume: 169 Issue: 1-4 Pages: 109-115
Year of Publication: 
M. M. M. Abdoh
Current Affiliation: 
Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine
A. M. Shaikh
N. C. Shivaprakash
J. Shashidhara Prasad
Preferred Abstract (Original): 

The crystals of 4-(4′-ethoxyphenylazo)phenyl heptanoate (C21H26N2O3) are triclinc, space group P[unk] with a = 7.935(3),b = 8.568(4), c = 16.216(4) Å, α = 73.61(3), β = 75.01(3), γ = 71.26(4)° and two molecules per unit cell. The structure was solved by direct method (MULTAN80) using 1922 observed reflections. The refinement by block-diagonal least-squares and Fourier methods gave R = 0.0457. The molecule is almost linear and planar. The angle between two phenyl rings is 15.02°. The pairs of molecules related by a centre of symmetry form an imbricated arrangement. The crystalline cohesion is a result of a large number of feeble dispersion forces and dipole-dipole interaction.