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Surprisingly, in the course of an X-Ray study of [TiCl2(CsH6)]206 we found definite evidence of colinearity of titanium and oxygen atoms. In fact, the crystals of (I), having^t hese unit cell constants: a = 7.47 Á.; b = 9.86 A.; c = 12.58 A.; 3 = 127°56', space group P21/c, have only two molecules per unit cell, so that the molecule must be centrosymmetrical.The colinearity of titanium and oxygen atoms is further confirmed by the Patterson and Fourier syntheses on the ac and be planes. At the present stage of refinement of the structure (R = 0.20), the fractional coordinates (x, y, z) of the heavy atoms have been assumed to be: Ti: 0.454, 0.132, 0.393; CF: 0.767, 0.132, 0.403; CW 0.178,0.047, 0.187.It results that: 1, as above said, the Ti-O-Ti atoms are colinear. 2, All the carbon atoms of the cyclopentadiene ring are at the same distance (2.35 ± 0.05 A.