############################################################################## # # # This CIF contains the data in a paper accepted for publication in # # Acta Crystallographica Section E. It conforms to the requirements of # # Notes for Authors for Acta Crystallographica Section E, and has been # # peer reviewed under the auspices of the IUCr Commission on Journals. # # # # Full details of the Crystallographic Information File format # # are given in the paper "The Crystallographic Information File (CIF): # # a New Standard Archive File for Crystallography" by S. R. Hall, F. H. # # Allen and I. D. Brown [Acta Cryst. (1991), A47, 655-685]. # # # # The current version of the core CIF dictionary is obtainable from # # ftp://ftp.iucr.org/pub/cif_core.dic. # # # # Software is freely available for graphical display of the structure(s) # # in this CIF. For information consult the CIF software page # # http://www.iucr.org/resources/cif/software. # # # # This file may be used for bona fide research purposes within the # # scientific community so long as proper attribution is given to the journal # # article from which it was obtained. # # # ############################################################################## data_I _audit_creation_method SHELXL-97 _chemical_name_systematic ; N-(3-Fluorobenzoyl)-N',N''-bis(4-methylphenyl)phosphoric triamide ; _chemical_name_common ? _chemical_formula_moiety 'C21 H21 F N3 O2 P' _chemical_formula_sum 'C21 H21 F N3 O2 P' _chemical_formula_iupac 'C21 H21 F N3 O2 P' _chemical_formula_weight 397.38 _chemical_melting_point ? _symmetry_cell_setting monoclinic _symmetry_space_group_name_H-M 'P 21/n' _symmetry_space_group_name_Hall '-P 2yn' loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, y+1/2, -z+1/2' '-x, -y, -z' 'x-1/2, -y-1/2, z-1/2' _cell_length_a 10.2132(5) _cell_length_b 9.8588(4) _cell_length_c 20.2711(9) _cell_angle_alpha 90.00 _cell_angle_beta 93.621(2) _cell_angle_gamma 90.00 _cell_volume 2037.02(16) _cell_formula_units_Z 4 _cell_measurement_reflns_used 6910 _cell_measurement_theta_min 2.29 _cell_measurement_theta_max 25.09 _cell_measurement_temperature 296(2) _exptl_crystal_description cubic _exptl_crystal_colour colorless _exptl_crystal_size_max 0.25 _exptl_crystal_size_mid 0.22 _exptl_crystal_size_min 0.14 _exptl_crystal_density_diffrn 1.296 _exptl_crystal_density_meas ? _exptl_crystal_density_method 'not measured' _exptl_crystal_F_000 832 _exptl_absorpt_coefficient_mu 0.165 _exptl_absorpt_correction_type multi-scan _exptl_absorpt_process_details '(SADABS; Bruker, 2007)' _exptl_absorpt_correction_T_min 0.6620 _exptl_absorpt_correction_T_max 0.7453 _exptl_special_details ; ; _diffrn_ambient_temperature 296(2) _diffrn_radiation_type MoK\a _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_source 'fine-focus sealed tube' _diffrn_radiation_monochromator graphite _diffrn_measurement_device_type 'Bruker APEXII CCD' _diffrn_measurement_method '\f and \w' _diffrn_detector_area_resol_mean ? _diffrn_reflns_number 20105 _diffrn_reflns_av_R_equivalents 0.0296 _diffrn_reflns_av_sigmaI/netI 0.0233 _diffrn_reflns_theta_min 2.87 _diffrn_reflns_theta_max 25.65 _diffrn_reflns_theta_full 25.65 _diffrn_measured_fraction_theta_max 0.998 _diffrn_measured_fraction_theta_full 0.998 _diffrn_reflns_limit_h_min -12 _diffrn_reflns_limit_h_max 12 _diffrn_reflns_limit_k_min -12 _diffrn_reflns_limit_k_max 11 _diffrn_reflns_limit_l_min -24 _diffrn_reflns_limit_l_max 24 _diffrn_standards_number ? _diffrn_standards_interval_count ? _diffrn_standards_interval_time ? _diffrn_standards_decay_% ? _refine_special_details ; Refinement of F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > 2\s(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ; _reflns_number_total 3844 _reflns_number_gt 3061 _reflns_threshold_expression I>2\s(I) _refine_ls_structure_factor_coef Fsqd _refine_ls_matrix_type full _refine_ls_R_factor_all 0.0529 _refine_ls_R_factor_gt 0.0391 _refine_ls_wR_factor_gt 0.1006 _refine_ls_wR_factor_ref 0.1089 _refine_ls_goodness_of_fit_ref 1.039 _refine_ls_restrained_S_all 1.039 _refine_ls_number_reflns 3844 _refine_ls_number_parameters 255 _refine_ls_number_restraints 0 _refine_ls_hydrogen_treatment constr _refine_ls_weighting_scheme calc _refine_ls_weighting_details 'calc w=1/[\s^2^(Fo^2^)+(0.0537P)^2^+0.6292P] where P=(Fo^2^+2Fc^2^)/3' _atom_sites_solution_hydrogens geom _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _refine_ls_shift/su_max 0.003 _refine_ls_shift/su_mean 0.000 _refine_diff_density_max 0.370 _refine_diff_density_min -0.354 _refine_ls_extinction_method none _refine_ls_extinction_coef ? loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source 'C' 'C' 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'H' 'H' 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'N' 'N' 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'O' 'O' 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'F' 'F' 0.0171 0.0103 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 'P' 'P' 0.1023 0.0942 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' _computing_data_collection 'APEX2 (Bruker, 2007)' _computing_cell_refinement 'SAINT (Bruker, 2007)' _computing_data_reduction 'SAINT (Bruker, 2007)' _computing_structure_solution 'SHELXS97 (Sheldrick, 2008)' _computing_structure_refinement 'SHELXL97 (Sheldrick, 2008)' _computing_molecular_graphics 'OLEX (Dolomanov et al., 2003)' _computing_publication_material 'SHELXTL (Sheldrick, 2008) and enCIFer (Allen et al., 2004)' loop_ _atom_site_type_symbol _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_adp_type _atom_site_calc_flag _atom_site_refinement_flags _atom_site_occupancy _atom_site_symmetry_multiplicity _atom_site_disorder_assembly _atom_site_disorder_group P P1 0.55273(4) 0.28199(4) 0.97803(2) 0.03501(15) Uani d . 1 1 . . F F1 0.00592(13) 0.50210(15) 1.10740(8) 0.0863(5) Uani d . 1 1 . . O O1 0.32311(13) 0.10156(12) 0.97315(7) 0.0522(4) Uani d . 1 1 . . O O2 0.62121(12) 0.41249(11) 0.97696(6) 0.0424(3) Uani d . 1 1 . . N N1 0.39319(14) 0.31600(13) 0.98654(7) 0.0384(4) Uani d . 1 1 . . H H1 0.3699 0.3994 0.9901 0.046 Uiso calc R 1 1 . . N N2 0.56968(16) 0.18952(15) 0.91224(7) 0.0457(4) Uani d . 1 1 . . H H2 0.5594 0.1032 0.9149 0.055 Uiso calc R 1 1 . . N N3 0.59807(15) 0.17934(14) 1.03822(7) 0.0407(4) Uani d . 1 1 . . H H3 0.6244 0.1001 1.0273 0.049 Uiso calc R 1 1 . . C C1 0.0244(2) 0.3949(2) 1.06744(11) 0.0523(5) Uani d . 1 1 . . C C2 0.14869(18) 0.36985(19) 1.04838(10) 0.0462(5) Uani d . 1 1 . . H H2A 0.2185 0.4259 1.0621 0.055 Uiso calc R 1 1 . . C C3 0.16722(17) 0.25899(17) 1.00822(9) 0.0381(4) Uani d . 1 1 . . C C4 0.29931(18) 0.21885(16) 0.98807(9) 0.0375(4) Uani d . 1 1 . . C C5 0.60112(19) 0.24700(18) 0.85011(9) 0.0439(4) Uani d . 1 1 . . C C6 0.7180(2) 0.3164(2) 0.84531(11) 0.0558(5) Uani d . 1 1 . . H H6 0.7763 0.3256 0.8822 0.067 Uiso calc R 1 1 . . C C7 0.7477(3) 0.3719(3) 0.78558(12) 0.0684(7) Uani d . 1 1 . . H H7 0.8258 0.4196 0.7831 0.082 Uiso calc R 1 1 . . C C8 0.6657(3) 0.3589(2) 0.72965(11) 0.0726(7) Uani d . 1 1 . . C C9 0.7009(4) 0.4217(3) 0.66478(14) 0.1173(13) Uani d . 1 1 . . H H9A 0.7807 0.3818 0.6512 0.176 Uiso calc R 1 1 . . H H9B 0.7130 0.5176 0.6705 0.176 Uiso calc R 1 1 . . H H9C 0.6314 0.4053 0.6316 0.176 Uiso calc R 1 1 . . C C10 0.06158(19) 0.1775(2) 0.98825(10) 0.0492(5) Uani d . 1 1 . . H H10 0.0741 0.1025 0.9616 0.059 Uiso calc R 1 1 . . C C11 -0.0622(2) 0.2074(2) 1.00776(12) 0.0601(6) Uani d . 1 1 . . H H11 -0.1329 0.1531 0.9936 0.072 Uiso calc R 1 1 . . C C12 -0.0815(2) 0.3170(2) 1.04808(12) 0.0591(6) Uani d . 1 1 . . H H12 -0.1645 0.3374 1.0617 0.071 Uiso calc R 1 1 . . C C13 0.59854(18) 0.20754(18) 1.10666(9) 0.0410(4) Uani d . 1 1 . . C C14 0.6514(2) 0.1138(2) 1.15103(10) 0.0577(5) Uani d . 1 1 . . H H14 0.6853 0.0331 1.1357 0.069 Uiso calc R 1 1 . . C C15 0.6545(3) 0.1384(3) 1.21817(12) 0.0753(7) Uani d . 1 1 . . H H15 0.6903 0.0735 1.2473 0.090 Uiso calc R 1 1 . . C C16 0.6059(3) 0.2569(3) 1.24288(11) 0.0699(7) Uani d . 1 1 . . C C17 0.5550(3) 0.3505(3) 1.19855(12) 0.0721(7) Uani d . 1 1 . . H H17 0.5225 0.4317 1.2142 0.087 Uiso calc R 1 1 . . C C18 0.5505(2) 0.3279(2) 1.13088(11) 0.0609(6) Uani d . 1 1 . . H H18 0.5154 0.3933 1.1019 0.073 Uiso calc R 1 1 . . C C19 0.6086(4) 0.2837(4) 1.31697(12) 0.1036(11) Uani d . 1 1 . . H H19A 0.6172 0.3794 1.3250 0.155 Uiso calc R 1 1 . . H H19B 0.6818 0.2370 1.3386 0.155 Uiso calc R 1 1 . . H H19C 0.5286 0.2517 1.3340 0.155 Uiso calc R 1 1 . . C C20 0.5180(2) 0.2333(2) 0.79481(11) 0.0633(6) Uani d . 1 1 . . H H20 0.4392 0.1869 0.7974 0.076 Uiso calc R 1 1 . . C C21 0.5505(3) 0.2879(3) 0.73502(11) 0.0772(8) Uani d . 1 1 . . H H21 0.4936 0.2766 0.6978 0.093 Uiso calc R 1 1 . . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 P1 0.0371(3) 0.0248(2) 0.0440(3) 0.00215(18) 0.00981(19) -0.00342(18) F1 0.0618(9) 0.0742(9) 0.1262(13) 0.0042(7) 0.0322(8) -0.0372(9) O1 0.0543(8) 0.0277(6) 0.0757(9) -0.0005(6) 0.0121(7) -0.0088(6) O2 0.0414(7) 0.0284(6) 0.0589(8) -0.0007(5) 0.0146(6) -0.0053(6) N1 0.0370(8) 0.0245(7) 0.0543(9) 0.0032(6) 0.0083(7) -0.0023(6) N2 0.0605(10) 0.0281(7) 0.0503(9) -0.0020(7) 0.0171(8) -0.0054(7) N3 0.0478(9) 0.0273(7) 0.0477(9) 0.0088(6) 0.0078(7) -0.0044(6) C1 0.0467(11) 0.0432(11) 0.0681(13) 0.0050(9) 0.0131(10) -0.0026(10) C2 0.0386(10) 0.0372(10) 0.0634(12) -0.0022(8) 0.0082(9) -0.0043(9) C3 0.0394(10) 0.0312(8) 0.0441(10) -0.0004(7) 0.0050(8) 0.0047(7) C4 0.0427(10) 0.0277(8) 0.0424(9) -0.0009(7) 0.0040(8) -0.0001(7) C5 0.0524(11) 0.0362(9) 0.0443(10) 0.0017(8) 0.0137(9) -0.0071(8) C6 0.0523(12) 0.0636(13) 0.0527(12) -0.0067(10) 0.0117(10) -0.0048(10) C7 0.0773(16) 0.0674(15) 0.0634(15) -0.0214(13) 0.0275(13) -0.0077(12) C8 0.113(2) 0.0568(13) 0.0499(13) -0.0161(14) 0.0230(14) -0.0076(11) C9 0.200(4) 0.098(2) 0.0569(16) -0.045(3) 0.036(2) 0.0000(16) C10 0.0486(12) 0.0433(10) 0.0556(12) -0.0079(9) 0.0027(9) -0.0022(9) C11 0.0420(12) 0.0631(14) 0.0747(15) -0.0108(10) -0.0004(10) 0.0009(12) C12 0.0368(11) 0.0619(13) 0.0796(15) 0.0015(10) 0.0108(10) 0.0076(12) C13 0.0419(10) 0.0363(9) 0.0450(10) -0.0035(8) 0.0052(8) -0.0018(8) C14 0.0731(15) 0.0432(11) 0.0556(13) 0.0021(10) -0.0059(11) 0.0006(9) C15 0.110(2) 0.0598(14) 0.0541(14) -0.0110(14) -0.0124(13) 0.0081(12) C16 0.0890(18) 0.0740(16) 0.0471(12) -0.0304(14) 0.0079(12) -0.0068(12) C17 0.0956(19) 0.0633(14) 0.0590(14) -0.0005(14) 0.0174(13) -0.0187(12) C18 0.0824(16) 0.0496(12) 0.0512(12) 0.0142(11) 0.0073(11) -0.0072(10) C19 0.148(3) 0.116(2) 0.0475(14) -0.048(2) 0.0094(16) -0.0108(15) C20 0.0697(15) 0.0617(14) 0.0588(13) -0.0191(12) 0.0068(11) -0.0095(11) C21 0.107(2) 0.0759(17) 0.0473(13) -0.0201(16) -0.0021(13) -0.0073(12) _geom_special_details ; All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes. ; loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_site_symmetry_2 _geom_bond_distance _geom_bond_publ_flag P1 O2 . 1.4652(12) ? P1 N3 . 1.6297(15) ? P1 N2 . 1.6336(15) ? P1 N1 . 1.6830(14) ? F1 C1 . 1.352(2) ? O1 C4 . 1.224(2) ? N1 C4 . 1.357(2) ? N1 H1 . 0.8600 ? N2 C5 . 1.436(2) ? N2 H2 . 0.8600 ? N3 C13 . 1.415(2) ? N3 H3 . 0.8600 ? C1 C12 . 1.364(3) ? C1 C2 . 1.373(3) ? C2 C3 . 1.383(3) ? C2 H2A . 0.9300 ? C3 C10 . 1.385(3) ? C3 C4 . 1.488(2) ? C5 C20 . 1.369(3) ? C5 C6 . 1.385(3) ? C6 C7 . 1.380(3) ? C6 H6 . 0.9300 ? C7 C8 . 1.373(4) ? C7 H7 . 0.9300 ? C8 C21 . 1.378(4) ? C8 C9 . 1.517(3) ? C9 H9A . 0.9600 ? C9 H9B . 0.9600 ? C9 H9C . 0.9600 ? C10 C11 . 1.380(3) ? C10 H10 . 0.9300 ? C11 C12 . 1.377(3) ? C11 H11 . 0.9300 ? C12 H12 . 0.9300 ? C13 C14 . 1.376(3) ? C13 C18 . 1.386(3) ? C14 C15 . 1.381(3) ? C14 H14 . 0.9300 ? C15 C16 . 1.376(4) ? C15 H15 . 0.9300 ? C16 C17 . 1.367(4) ? C16 C19 . 1.523(3) ? C17 C18 . 1.388(3) ? C17 H17 . 0.9300 ? C18 H18 . 0.9300 ? C19 H19A . 0.9600 ? C19 H19B . 0.9600 ? C19 H19C . 0.9600 ? C20 C21 . 1.386(3) ? C20 H20 . 0.9300 ? C21 H21 . 0.9300 ? loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle _geom_angle_publ_flag O2 P1 N3 . . 116.29(8) ? O2 P1 N2 . . 113.75(7) ? N3 P1 N2 . . 103.00(8) ? O2 P1 N1 . . 107.02(7) ? N3 P1 N1 . . 106.15(7) ? N2 P1 N1 . . 110.37(8) ? C4 N1 P1 . . 123.49(12) ? C4 N1 H1 . . 118.3 ? P1 N1 H1 . . 118.3 ? C5 N2 P1 . . 122.47(12) ? C5 N2 H2 . . 118.8 ? P1 N2 H2 . . 118.8 ? C13 N3 P1 . . 126.55(12) ? C13 N3 H3 . . 116.7 ? P1 N3 H3 . . 116.7 ? F1 C1 C12 . . 118.31(18) ? F1 C1 C2 . . 118.40(19) ? C12 C1 C2 . . 123.3(2) ? C1 C2 C3 . . 118.11(18) ? C1 C2 H2A . . 120.9 ? C3 C2 H2A . . 120.9 ? C2 C3 C10 . . 119.83(17) ? C2 C3 C4 . . 122.14(16) ? C10 C3 C4 . . 117.95(16) ? O1 C4 N1 . . 120.64(16) ? O1 C4 C3 . . 121.13(16) ? N1 C4 C3 . . 118.22(14) ? C20 C5 C6 . . 118.93(19) ? C20 C5 N2 . . 121.18(18) ? C6 C5 N2 . . 119.89(18) ? C7 C6 C5 . . 119.7(2) ? C7 C6 H6 . . 120.1 ? C5 C6 H6 . . 120.1 ? C8 C7 C6 . . 122.1(2) ? C8 C7 H7 . . 119.0 ? C6 C7 H7 . . 119.0 ? C7 C8 C21 . . 117.5(2) ? C7 C8 C9 . . 120.8(3) ? C21 C8 C9 . . 121.7(3) ? C8 C9 H9A . . 109.5 ? C8 C9 H9B . . 109.5 ? H9A C9 H9B . . 109.5 ? C8 C9 H9C . . 109.5 ? H9A C9 H9C . . 109.5 ? H9B C9 H9C . . 109.5 ? C11 C10 C3 . . 120.22(19) ? C11 C10 H10 . . 119.9 ? C3 C10 H10 . . 119.9 ? C12 C11 C10 . . 120.4(2) ? C12 C11 H11 . . 119.8 ? C10 C11 H11 . . 119.8 ? C1 C12 C11 . . 118.13(19) ? C1 C12 H12 . . 120.9 ? C11 C12 H12 . . 120.9 ? C14 C13 C18 . . 118.45(19) ? C14 C13 N3 . . 119.09(17) ? C18 C13 N3 . . 122.44(17) ? C13 C14 C15 . . 120.7(2) ? C13 C14 H14 . . 119.7 ? C15 C14 H14 . . 119.7 ? C16 C15 C14 . . 121.4(2) ? C16 C15 H15 . . 119.3 ? C14 C15 H15 . . 119.3 ? C17 C16 C15 . . 117.7(2) ? C17 C16 C19 . . 120.9(3) ? C15 C16 C19 . . 121.4(3) ? C16 C17 C18 . . 121.9(2) ? C16 C17 H17 . . 119.0 ? C18 C17 H17 . . 119.0 ? C13 C18 C17 . . 119.8(2) ? C13 C18 H18 . . 120.1 ? C17 C18 H18 . . 120.1 ? C16 C19 H19A . . 109.5 ? C16 C19 H19B . . 109.5 ? H19A C19 H19B . . 109.5 ? C16 C19 H19C . . 109.5 ? H19A C19 H19C . . 109.5 ? H19B C19 H19C . . 109.5 ? C5 C20 C21 . . 120.5(2) ? C5 C20 H20 . . 119.8 ? C21 C20 H20 . . 119.8 ? C8 C21 C20 . . 121.3(2) ? C8 C21 H21 . . 119.4 ? C20 C21 H21 . . 119.4 ? loop_ _geom_hbond_atom_site_label_D _geom_hbond_atom_site_label_H _geom_hbond_atom_site_label_A _geom_hbond_site_symmetry_A _geom_hbond_distance_DH _geom_hbond_distance_HA _geom_hbond_distance_DA _geom_hbond_angle_DHA N1 H1 O2 3_667 0.86 1.97 2.7835(18) 157.0 N3 H3 O1 3_657 0.86 2.06 2.8972(18) 164.6 data_global _journal_date_recd_electronic 2011-10-03 _journal_date_accepted 2011-10-17 _journal_name_full 'Acta Crystallographica, Section E' _journal_year 2011 _journal_volume 67 _journal_issue 11 _journal_page_first o3034 _journal_page_last o3034 _journal_paper_category QO _journal_coeditor_code LH5349 _publ_contact_author_name 'Mehrdad Pourayoubi' _publ_contact_author_address ; Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91779, Iran ; _publ_contact_author_email mehrdad_pourayoubi@yahoo.com _publ_contact_author_fax '(+98)-511-8796416' _publ_contact_author_phone '(+98)-511-8795457' _publ_section_title ; N-(3-Fluorobenzoyl)-N',N''-bis(4-methylphenyl)phosphoric triamide ; loop_ _publ_author_name _publ_author_address 'Pourayoubi, Mehrdad' ; Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91779, Iran ; 'Shoghpour, Samad' ; Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91779, Iran ; 'Bruno, Giuseppe' ; Dipartimento di Chimica Inorganica, Villaggio S. Agata, Salita Sperone 31, Universit\`a di Messina, 98166 Messina, Italy ; 'Amiri Rudbari, Hadi' ; Dipartimento di Chimica Inorganica, Villaggio S. Agata, Salita Sperone 31, Universit\`a di Messina, 98166 Messina, Italy ;