The crystal structure of (CeH5)Si(OCH2CH2)3N has been determined by three-dimensional X-ray diffraction methods and confirms the predicted pentacoordination of silicon in this compound. The distorted trigonal bipyramid coordination geometry of the silicon has the three equatorial oxygens bent away from the phenyl group toward the nitrogen as shown by the average C-Si-O angle of 97.1 °and the average O-Si-O angle of 118.5°. Bond distances to the silicon are Si-O(l) 1.638 Á, Si-0(2) 1.664 Á, Si-0(3) 1.665 A, Si-C 1.882 Á, and Si-N 2.193 A. The space group is Pbca with a = 13.220 A, b = 18.524 Á, c = 10.050 A and eight molecules per unit cell. The structure was solved by iterative application of Sayre's method in three dimensions using a visual data set. Refinement was by full matrix least squares to a final reliability index of 10.8%. Data Collection. Crystals of phenyl-(2,2',2"-nitrilotriethoxy)silane are colorless with a lath-like habit and a melting point of 207-(12) R.

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