Pseudopolymorphism of <i>N</i>-acetyl-<small>L</small>-phenylalanine methyl ester
Janik, Alicja; Jarocha, Monika; Stadnicka, Katarzyna; Acta Crystallographica Section B 64 (2008) 223–229; doi:10.1107/S010876810800219X

data_2104051
_publ_section_title
;
 Pseudopolymorphism of <i>N</i>-acetyl-<small>L</small>-phenylalanine
 methyl ester
;
_journal_coeditor_code           BM5052
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              223
_journal_page_last               229
_journal_paper_doi               10.1107/S010876810800219X
_journal_volume                  64
_journal_year                    2008
_chemical_formula_moiety         '2(C12 H15 N O3), H2 O'
_chemical_formula_sum            'C24 H32 N2 O7'
_chemical_formula_weight         460.52
_chemical_name_systematic
;
N-Acetyl-L-phenylalanine methyl ester hemihydrate
;
_space_group_IT_number           92
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4abw 2nw'
_symmetry_space_group_name_H-M   'P 41 21 2'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.15820(10)
_cell_length_b                   7.15820(10)
_cell_length_c                   47.5286(6)
_cell_measurement_reflns_used    3565
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      33.728
_cell_measurement_theta_min      2.910
_cell_volume                     2435.36(6)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1997)'
_computing_data_reduction
'HKL DENZO and Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics
;
 PLATON (Spek, 2003); ORTEP3 for Windows (Farrugia, 1997); MERCURY (Version
 1.4; Macrae et al., 2006)
;
_computing_publication_material  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       '\w scans at \c = 55 deg'
_diffrn_radiation_monochromator  'horizontally mounted graphite crystal'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0260
_diffrn_reflns_av_sigmaI/netI    0.0408
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       61
_diffrn_reflns_limit_l_min       -61
_diffrn_reflns_number            11430
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.97
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_T_max  0.9890
_exptl_absorpt_correction_T_min  0.9710
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'HKL DENZO and Scalepack (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.256
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.165
_refine_diff_density_min         -0.171
_refine_ls_extinction_coef       0.019(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.064
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     152
_refine_ls_number_reflns         1738
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.064
_refine_ls_R_factor_all          0.0673
_refine_ls_R_factor_gt           0.0446
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0566P)^2^+0.2801P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1102
_refine_ls_wR_factor_ref         0.1192
_reflns_number_gt                1270
_reflns_number_total             1738
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bm5052.cif
_cod_data_source_block           IIa
_cod_database_code               2104051