MOLECULAR AND CRYSTAL-STRUCTURES OF PH2P(O)(CH2)2OH AND PH2P(O)CH2(C6H6)OH

The molecular and crystal structures Of Ph2P(O)(CH2)2OH and Ph2P(O)CH2 (C6H6)OH have been determined For the first compound the space group i s P1BAR with unit cell dimensions a = 10.505(2), b = 13.720(2), c = 14 .782(3) angstrom; alpha = 72.58(6), beta = 76.95(6), gamma = 72.49(6)- degrees for Z = 6 (syntex P1BAR diffractometer, MoK(alpha) radiation, 2996 reflections, R = 3.2%). The second compound crystallizes in the s pace group P2(1)2(1)2(1) with unit cell dimensions a = 9.371(3), b = 9 .014(3), c = 18.461(5) angstrom for Z = 4 (DAR-UM diffractometer, CuK( alpha) radiation, 909 reflections, R = 4.9%). In Ph2P(O)(CH2)2OH, thre e independent molecules differing in structural details are linked by the P = O...H-O hydrogen bonds (O...H is 1.84, 1.80, and 1.86 angstrom ), to form a chain. In Ph2P(O)CH2(C6H6)OH, the molecules are joined by pairs of the P = O...H-O bonds (O...H is 1.81 angstrom) to form 16-me mbered dimeric associates.