PI ACIDITY OF TRIS(2-CYANOETHYL)PHOSPHINE - X-RAY STRUCTURAL STUDIES OF M(CO)5P(CH2CH2CN)3(M=CR,MO) AND MO(CO)5P(C6H5)3
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The X-ray crystal structures and IR spectra of the compounds M(CO)5P(CH2CH2CN)3, M = Cr (1) and Mo (2), and Mo(CO)5P(C6H5)3 (3) are reported. Compounds 1 and 2 are isomorphous and crystallize in the monoclinic space group P2Jn with unit cell parameters a = 16.913 (5) , 17.140 (2) , b = 6.538 (3) , 6.639 (1) , c = 17.402 (4) , 17.574 (2) , = 117.91 (2), 118.09 (1), v = 1700 (2) 3,1764.3 (9) 3, and Z = 4,4, where the two figures for each parameter refer to the Cr and Mo compounds, respectively. Each molecule occupies a general position within the unit cell. The M-P distances are 2.364 (1) and 2.506 (1) A for the Cr and Mo compounds, and the average M-COax and M-COeq distances are 1.876 (4) and 1.891 (4) and 2.008 (4) and 2.044 (5) , respectively. Compound 3 crystallizes in the triclinic space group PI with unit cell parameters a = 9.653 (5) , b = 12.301 (5) , c = 9.503 (8) , = 90.88 (5), = 95.73 (5), y = 74.89 (4), V = 1084 (2) 3, and Z =2. Again, each molecule occupies a general position within the cell. The Mo-P distance is 2.560 (1) A and the average Mo-COax and Mo-COeq distances are 1.995 (3) and 2.046 (4) , respectively. On the basis of these structural data as well as v(CO) infrared data, tris(2-cyanoethyl)phosphine can be described as a good -acceptor ligand. 1981, American Chemical Society. All rights reserved.
