High-pressure polymorphism in l-threonine between ambient pressure and 22 GPa
Giordano, Nico; Beavers, Christine M.; Kamenev, Konstantin V.; Marshall, William G.; Moggach, Stephen A.; Patterson, Simon D.; Teat, Simon J.; Warren, John E.; Wood, Peter A.; Parsons, Simon; CrystEngComm 21 (2019) 4444–; doi:10.1039/C9CE00388F

data_7232737
_publ_section_title
;
 High-pressure polymorphism in l-threonine between ambient pressure and 22
 GPa
;
_journal_issue                   30
_journal_name_full               CrystEngComm
_journal_page_first              4444
_journal_paper_doi               10.1039/C9CE00388F
_journal_volume                  21
_journal_year                    2019
_chemical_formula_sum            'C4 H9 N O3'
_chemical_formula_weight         119.12
_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'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2019-03-15 deposited with the CCDC.    2019-05-09 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   4.9824(6)
_cell_length_b                   13.353(3)
_cell_length_c                   7.0029(14)
_cell_measurement_reflns_used    1146
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      17.151
_cell_measurement_theta_min      2.835
_cell_volume                     465.90(15)
_computing_cell_refinement       'SAINT v7.68A (Bruker, 2009)'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_pressure         4.02
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.614
_diffrn_measured_fraction_theta_max 0.617
_diffrn_measurement_device_type  'Bruker-Nonius APEX II'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.478
_diffrn_reflns_av_R_equivalents  0.0545
_diffrn_reflns_av_unetI/netI     0.0532
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            2494
_diffrn_reflns_point_group_measured_fraction_full 0.647
_diffrn_reflns_point_group_measured_fraction_max 0.646
_diffrn_reflns_theta_full        16.666
_diffrn_reflns_theta_max         17.370
_diffrn_reflns_theta_min         2.835
_exptl_absorpt_coefficient_mu    0.067
_exptl_absorpt_correction_T_max  0.7441
_exptl_absorpt_correction_T_min  0.6153
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.1281 before and 0.0631 after correction.
The Ratio of minimum to maximum transmission is 0.8269.
The \l/2 correction factor is 0.0000.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.698
_exptl_crystal_description       blade
_exptl_crystal_F_000             256
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.417
_refine_diff_density_min         -0.308
_refine_diff_density_rms         0.073
_refine_ls_abs_structure_details
;
 Flack x determined using 208 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.6(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.124
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     33
_refine_ls_number_reflns         618
_refine_ls_number_restraints     17
_refine_ls_restrained_S_all      1.112
_refine_ls_R_factor_all          0.0727
_refine_ls_R_factor_gt           0.0622
_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^)+(0.0996P)^2^+0.3940P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1656
_refine_ls_wR_factor_ref         0.1718
_reflns_Friedel_coverage         0.698
_reflns_Friedel_fraction_full    0.700
_reflns_Friedel_fraction_max     0.692
_reflns_number_gt                546
_reflns_number_total             618
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9ce00388f5.cif
_cod_data_source_block           4_02GPa
_cod_depositor_comments
'Adding full bibliography for 7232730--7232750.cif.'
_cod_original_cell_volume        465.89(15)
_cod_database_code               7232737
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.993
_shelx_estimated_absorpt_t_max   0.993
_shelx_res_checksum              35859