Theoretically derived thermodynamic properties can be improved by the refinement of low-frequency modes against X-ray diffraction data.
Hoser, Anna A.; Sztylko, Marcin; Trzybiński, Damian; Madsen, Anders Ø; Chemical communications (Cambridge, England) 57 (2021) 9370–9373; doi:10.1039/d1cc02608a

data_7128793
_publ_section_title
;
 Theoretically derived thermodynamic properties can be improved by the
 refinement of low-frequency modes against X-ray diffraction data.
;
_journal_issue                   74
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              9370
_journal_page_last               9373
_journal_paper_doi               10.1039/d1cc02608a
_journal_volume                  57
_journal_year                    2021
_chemical_formula_moiety         'C2 H5 N O2'
_chemical_formula_sum            'C2 H5 N O2'
_chemical_formula_weight         75.07
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2021-04-03
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2021-05-13 deposited with the CCDC.	2021-08-11 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 113.422(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.0757(2)
_cell_length_b                   6.1737(2)
_cell_length_c                   5.3882(2)
_cell_measurement_reflns_used    7569
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.4690
_cell_measurement_theta_min      4.1100
_cell_volume                     154.931(11)
_computing_cell_refinement       'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_data_collection       'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_data_reduction        'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 16.0026
_diffrn_detector_type            Eos
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
  1  \w     -4.00 102.00   1.00   16.50    --   29.20  77.00 -30.00  106
  2  \w     21.00 109.00   1.00   16.50    --   29.20-160.00 150.00   88
  3  \w     -4.00 102.00   1.00   16.50    --   29.20  77.00-120.00  106
  4  \w     -4.00 102.00   1.00   16.50    --   29.20  77.00  60.00  106
  5  \w     21.00 109.00   1.00   16.50    --   29.20-160.00 -30.00   88
  6  \w     -4.00 102.00   1.00   16.50    --   29.20  77.00 150.00  106
  7  \w   -104.00 -49.00   1.00   16.50    --  -29.36-160.00  30.00   55
  8  \w   -104.00 -49.00   1.00   16.50    --  -29.36-160.00-150.00   55
  9  \w   -104.00  46.00   1.00   16.50    --  -29.36   0.00-120.00  150
 10  \w   -104.00  46.00   1.00   16.50    --  -29.36   0.00  60.00  150
 11  \w     49.00 103.00   1.00   16.50    --   29.20 160.00 120.00   54
 12  \w     -1.00 102.00   1.00   16.50    --   29.20  39.00-153.00  103
 13  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00-180.00  150
 14  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00-150.00  150
 15  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00-120.00  150
 16  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00 -90.00  150
 17  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00 -60.00  150
 18  \w     49.00 103.00   1.00   16.50    --   29.20 160.00 -60.00   54
 19  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00   0.00  150
 20  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00  30.00  150
 21  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00  60.00  150
 22  \w    -46.00  15.00   1.00   16.50    --   29.20   0.00  90.00   61
 23  \w    -46.00 104.00   1.00   16.50    --   29.20   0.00 -30.00  150
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Single source at offset/far, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      -0.0174620000
_diffrn_orient_matrix_UB_12      0.0365213000
_diffrn_orient_matrix_UB_13      0.1173579000
_diffrn_orient_matrix_UB_21      0.1358886000
_diffrn_orient_matrix_UB_22      -0.0440451000
_diffrn_orient_matrix_UB_23      0.0822356000
_diffrn_orient_matrix_UB_31      0.0665108000
_diffrn_orient_matrix_UB_32      0.0996248000
_diffrn_orient_matrix_UB_33      -0.0066449000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0314
_diffrn_reflns_av_unetI/netI     0.0131
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            9425
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.489
_diffrn_reflns_theta_min         4.122
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.143
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.37619
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.40.67a (Rigaku Oxford Diffraction, 2019)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.609
_exptl_crystal_description       needle
_exptl_crystal_F_000             80
_exptl_crystal_size_max          0.69
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.409
_refine_diff_density_min         -0.194
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details
;
 Flack x determined using 423 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.3(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     55
_refine_ls_number_reflns         942
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.098
_refine_ls_R_factor_all          0.0233
_refine_ls_R_factor_gt           0.0229
_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^)+(0.0321P)^2^+0.0406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0638
_refine_ls_wR_factor_ref         0.0642
_reflns_Friedel_coverage         0.843
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                931
_reflns_number_total             942
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1cc02608a2.cif
_cod_data_source_block           2016_09_29_dt_b-gly_d
_cod_depositor_comments
'Adding full bibliography for 7128792--7128793.cif.'
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7128793
_shelx_shelxl_version_number     2016/4
_reflns_odcompleteness_completeness 100.00
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     30.44
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H,H) groups, All N(H,H,H) groups
2. Restrained distances
 N1-H1B
 0.87 with sigma of 0.01
 N1-H1C
 0.87 with sigma of 0.01
 N1-H1A
 0.87 with sigma of 0.01
3.a Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B)
;
_shelx_res_checksum              14929
_shelx_hkl_checksum              87126
_olex2_date_sample_data_collection 2016-09-29
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 1.444
_oxdiff_exptl_absorpt_empirical_full_min 0.351