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_7242511
_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 rm
_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            4
_cell_length_a                   5.759(3)
_cell_length_b                   5.772(3)
_cell_length_c                   12.492(7)
_cell_measurement_reflns_used    1724
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.17
_cell_measurement_theta_min      3.26
_cell_volume                     415.2(4)
_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 1.000
_diffrn_measured_fraction_theta_max 1.000
_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_unetI/netI     0.0517
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       0
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1247
_diffrn_reflns_point_group_measured_fraction_full 0.621
_diffrn_reflns_point_group_measured_fraction_max 0.620
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.403
_diffrn_reflns_theta_min         3.261
_exptl_absorpt_coefficient_mu    0.131
_exptl_absorpt_correction_T_max  0.862013
_exptl_absorpt_correction_T_min  0.660675
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.441
_exptl_crystal_description       needle
_exptl_crystal_F_000             192
_exptl_crystal_recrystallization_method 'From the Melt'
_exptl_crystal_size_max          0.540
_exptl_crystal_size_mid          0.080
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.239
_refine_diff_density_min         -0.182
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details
;
No quotients, so Flack parameter determined by classical intensity fit
;
_refine_ls_abs_structure_Flack   0.4(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     65
_refine_ls_number_reflns         1247
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.062
_refine_ls_R_factor_all          0.0614
_refine_ls_R_factor_gt           0.0493
_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^)+(0.0738P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1184
_refine_ls_wR_factor_ref         0.1226
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    0.000
_reflns_Friedel_fraction_max     0.000
_reflns_number_gt                1041
_reflns_number_total             1247
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1ce00285f2.cif
_cod_data_source_block           18bek65h_100K_twin5
_cod_depositor_comments
'Adding full bibliography for 7242509--7242511.cif.'
_cod_original_cell_volume        415.3(4)
_cod_database_code               7242511
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.933
_shelx_estimated_absorpt_t_max   0.995
_shelx_res_checksum              46946