Crystal structures of triphenyl thiophosphate and selenophosphate, (C6H5)3PO3X (X = S, Se)

C18H15O3PS, orthorhombic, P2(1)2(1)2(1) (no. 19), a = 7.924(2) angstrom, b = 13.287(1) angstrom, c = 16.138(4) angstrom, V = 1699.2 angstrom(3), Z = 4, R-gt(F) = 0.027, wR(obs)(F-2) = 0.075, T = 293 K. C18H15O3PSe, orthorhombic, P2(1)2(1)2(1) (no. 19), a = 7.839(8) angstrom, b = 13.559(1) angstrom, c = 16.1340(9) angstrom, V = 1714.9 angstrom(3), Z = 4, R-gt(F) = 0.036, WRobs(F-2) = 0.081, T = 293 K.