Ambient l-lactic acid crystal polymorphism
Yang, Jingxiang; Hu, Chunhua T.; Reiter, Ethan; Kahr, Bart; CrystEngComm 23 (2021) 2644–2647; doi:10.1039/D1CE00285F

data_7242509
_publ_section_title
;
 Ambient l-lactic acid crystal polymorphism
;
_journal_issue                   14
_journal_name_full               CrystEngComm
_journal_page_first              2644
_journal_page_last               2647
_journal_paper_doi               10.1039/D1CE00285F
_journal_volume                  23
_journal_year                    2021
_chemical_absolute_configuration syn
_chemical_formula_sum            'C3 H6 O3'
_chemical_formula_weight         90.08
_chemical_properties_physical    Hygroscopic
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2019-10-30 deposited with the CCDC.	2021-03-23 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   5.7323(3)
_cell_length_b                   9.0190(5)
_cell_length_c                   17.3597(10)
_cell_measurement_reflns_used    5183
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.22
_cell_measurement_theta_min      2.35
_cell_volume                     897.49(9)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT (Sheldrick 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0310
_diffrn_reflns_av_unetI/netI     0.0202
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            14087
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.294
_diffrn_reflns_theta_min         2.545
_exptl_absorpt_coefficient_mu    0.121
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.7101
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.333
_exptl_crystal_description       slab
_exptl_crystal_F_000             384
_exptl_crystal_recrystallization_method 'From the Melt'
_exptl_crystal_size_max          0.540
_exptl_crystal_size_mid          0.290
_exptl_crystal_size_min          0.060
_refine_diff_density_max         0.224
_refine_diff_density_min         -0.171
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details
;
 Flack x determined using 826 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.6(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     126
_refine_ls_number_reflns         2237
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0304
_refine_ls_R_factor_gt           0.0283
_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^)+(0.0446P)^2^+0.0360P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0707
_refine_ls_wR_factor_ref         0.0717
_reflns_Friedel_coverage         0.691
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                2104
_reflns_number_total             2237
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1ce00285f2.cif
_cod_data_source_block           18bek42h
_cod_depositor_comments
'Adding full bibliography for 7242509--7242511.cif.'
_cod_database_code               7242509
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.938
_shelx_estimated_absorpt_t_max   0.993
_shelx_res_checksum              11471