The atomic and molecular arrangement in crystalline 4:4'-dimethyldibenzyl has been determined by X-ray diffraction. The unit cell dimensions are a = 23.36, b = 6.10, c = 9.16 A; fl = 100.5 °. The space group is I2/a. The shape of the molecule is similar to that of dibenzyl, and the relationship between the structures of the two substances is discussed. Bond lengths and inter-bond angles agree with standard values, but no attempt has been made to carry the determination to high accuracy because the unsuitable nature of the crystals and consequent unreliability of the intensities of the reflexions did not warrant the expenditure of further time and ~ffort.
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Carolyn J. Brown (1954) studied this question.