Imazamox: A Quest for Polymorphic Modifications of a Chiral and Racemic Herbicide
Braga, Dario; Chelazzi, Laura; Grepioni, Fabrizia; Nanna, Saverio; Rubini, Katia; Curzi, Marco; Giaffreda, Stefano; Saxell, Heidi E.; Bratz, Matthias; Chiodo, Tiziana; Crystal Growth & Design 14 (2014) 1430–; doi:10.1021/cg4019025

data_4510090
_publ_section_title
;
 Imazamox: A Quest for Polymorphic Modifications of a Chiral and Racemic
 Herbicide
;
_journal_issue                   3
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              1430
_journal_paper_doi               10.1021/cg4019025
_journal_volume                  14
_journal_year                    2014
_chemical_absolute_configuration rm
_chemical_formula_sum            'C15 H19 N3 O4'
_chemical_formula_weight         305.33
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.2754(11)
_cell_length_b                   16.048(3)
_cell_length_c                   25.129(4)
_cell_measurement_temperature    103(2)
_cell_volume                     2934.0(8)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      103(2)
_diffrn_measured_fraction_theta_full 0.964
_diffrn_measured_fraction_theta_max 0.964
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0435
_diffrn_reflns_av_sigmaI/netI    0.0385
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            16847
_diffrn_reflns_theta_full        57.35
_diffrn_reflns_theta_max         57.35
_diffrn_reflns_theta_min         3.27
_exptl_absorpt_coefficient_mu    0.844
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.98216
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET)
(compiled Oct 25 2010,18:11:34)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_density_diffrn    1.382
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1296
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.198
_refine_diff_density_min         -0.179
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.7(3)
_refine_ls_extinction_coef       0.00210(16)
_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   1.061
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     406
_refine_ls_number_reflns         3731
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0452
_refine_ls_R_factor_gt           0.0385
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0442P)^2^+1.1207P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0884
_refine_ls_wR_factor_ref         0.0908
_reflns_number_gt                3313
_reflns_number_total             3731
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg4019025_si_004.cif
_cod_data_source_block           sax087
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               4510090