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The crystal structures of alpha, omega dihalogenoalkanes, having the number of carbon atoms n of 20 and 26, were studied. The lattice parameters of those chloro-, bromo-, and indo-compounds (abb. C12C...n, Br2Cn, and I2Cn) were determined by the Weissenberg method. The atomic coordinates for I2C20 and Br2C26 were determined. The crystals of I2Cn belong to the space group P21/a, while the crystals of C12Cn and Br2Cn to P21/n, Though the difference in the space group is due to the ce11 choice, the packing of the methylene chains entirely differs. The I2Cn molecules packs with a herringbone arrangement, while the chains in the C12Cn and Br2Cn crystals dispose in paralle1. The Br2C26 chains show a zigzag alignment with each other along the 6 axis. It is shown that this packing is favorable to the electrostatic interaction between dipole moments of the halogen-carbon bond. It seems that the dipole-dipole interaction does not play an important role in the I2Cn crystal, for the arrangement of the chains.続きを見る
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Mendeley出力
