A bug in enantiomer separation: double salt formation ‒ diastereomeric and double salt structures of 1-cyclohexylethylammonium 2- and 4-chloromandelate
Bereczki, Laura; Zodge, Amit; Kőrösi, Márton; Holczbauer, Tamás; De, Sourav; Székely, Edit; Bombicz, Petra; CrystEngComm 23 (2021) 5367–5376; doi:10.1039/D1CE00145K

data_7243247
_publ_section_title
;
 A bug in enantiomer separation: double salt formation -- diastereomeric
 and double salt structures of 1-cyclohexylethylammonium 2- and
 4-chloromandelate
;
_journal_issue                   31
_journal_name_full               CrystEngComm
_journal_page_first              5367
_journal_page_last               5376
_journal_paper_doi               10.1039/D1CE00145K
_journal_volume                  23
_journal_year                    2021
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C8 H18 N 1+, C8 H6 Cl O3 1-'
_chemical_formula_sum            'C16 H24 Cl N O3'
_chemical_formula_weight         313.81
_chemical_melting_point          398(1)
_chemical_name_common
;
(R)-(1-cyclohexylethyl)ammonium (S)-2-chloromandelate'
;
_chemical_name_systematic
;
(R)-(1-cyclohexylethyl)ammonium (S)-2-(2-chlorophenyl)-2-hydroxyacetate
;
_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   geom
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2021-01-29 deposited with the CCDC.	2021-07-05 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.337(3)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   9.0572(9)
_cell_length_b                   29.711(3)
_cell_length_c                   12.6381(13)
_cell_measurement_reflns_used    24274
_cell_measurement_temperature    143(2)
_cell_measurement_theta_max      25.300
_cell_measurement_theta_min      3.040
_cell_volume                     3395.1(6)
_computing_cell_refinement
;
RAPID-AUTO (Rigaku Corp., Tokyo, Japan, 2015)
;
_computing_data_collection
;
RAPID-AUTO (Rigaku Corp., Tokyo, Japan, 2015)
;
_computing_data_reduction
;
RAPID-AUTO (Rigaku Corp., Tokyo, Japan, 2015)
;
_computing_molecular_graphics
;
Spek, A.L. (2003). J.Appl.Cryst. 36,7-13.
;
_computing_publication_material
;
C. F. Macrae, J. Appl. Cryst., 41, 466-470, 2008
;
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution
;
Palatinus, L. & Chapuis, G. (2007). J. Appl. Cryst. 40, 786-790.
;
_diffrn_ambient_temperature      143(2)
_diffrn_detector_area_resol_mean 10.0000
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  RAXIS-RAPID
_diffrn_measurement_method       dtprofit.ref
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.1721
_diffrn_reflns_av_unetI/netI     0.1600
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       35
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            45929
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.348
_diffrn_reflns_theta_min         3.023
_diffrn_source                   'Sealed Tube'
_exptl_absorpt_coefficient_mu    0.234
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.298
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
NUMABS (T.Higashi, 2001)
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.228
_exptl_crystal_description       platelet
_exptl_crystal_F_000             1344
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.05
_exptl_transmission_factor_max   1.00000
_exptl_transmission_factor_min   0.29770
_refine_diff_density_max         0.481
_refine_diff_density_min         -0.389
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details
;
 Flack x determined using 1399 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.02(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     972
_refine_ls_number_reflns         12376
_refine_ls_number_restraints     386
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.1934
_refine_ls_R_factor_gt           0.0934
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1013P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1687
_refine_ls_wR_factor_ref         0.2376
_reflns_Friedel_coverage         0.958
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.996
_reflns_number_gt                5895
_reflns_number_total             45929
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d1ce00145k2.cif
_cod_data_source_block           shelx_CCDC5
_cod_depositor_comments
'Adding full bibliography for 7243242--7243247.cif.'
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7243247
_shelx_res_checksum              93738
_shelx_hkl_checksum              69253