Discovery and recovery of delta p-aminobenzoic acid
Ward, Martin R.; Younis, Shatha; Cruz-Cabeza, Aurora J.; Bull, Craig L.; Funnell, Nicholas P.; Oswald, Iain D. H.; CrystEngComm 21 (2019) 2058–; doi:10.1039/C8CE01882K

data_7232196
_publ_section_title
;
 Discovery and recovery of delta p-aminobenzoic acid
;
_journal_issue                   13
_journal_name_full               CrystEngComm
_journal_page_first              2058
_journal_paper_doi               10.1039/C8CE01882K
_journal_volume                  21
_journal_year                    2019
_chemical_formula_moiety         'C7 H7 N O2'
_chemical_formula_sum            'C7 H7 N O2'
_chemical_formula_weight         137.14
_chemical_name_systematic        'p-aminobenzoic acid'
_space_group_crystal_system      monoclinic
_space_group_IT_number           7
_space_group_name_Hall           'P -2yac'
_space_group_name_H-M_alt        'P 1 n 1'
_symmetry_space_group_name_Hall  'P -2yac'
_symmetry_space_group_name_H-M   'P 1 n 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2018-11-01
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2018-11-01 deposited with the CCDC.
2019-01-21 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 100.748(14)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   6.4003(11)
_cell_length_b                   4.5981(4)
_cell_length_c                   10.4452(15)
_cell_measurement_reflns_used    746
_cell_measurement_temperature    295.01
_cell_measurement_theta_max      25.105
_cell_measurement_theta_min      3.470
_cell_volume                     302.00(7)
_computing_cell_refinement       'SAINT v8.37A (Bruker, 2015)'
_computing_data_reduction        'SAINT v8.37A (Bruker, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'XT (Sheldrick, 2015)'
_diffrn_ambient_temperature      295.01
_diffrn_detector                 'Bruker APEX2 area detector'
_diffrn_detector_area_resol_mean 7.9
_diffrn_detector_type            'CCD area detector'
_diffrn_measured_fraction_theta_full 0.403
_diffrn_measured_fraction_theta_max 0.403
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker SMART APEX2 area detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  'mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0298
_diffrn_reflns_av_unetI/netI     0.0311
_diffrn_reflns_Laue_measured_fraction_full 0.403
_diffrn_reflns_Laue_measured_fraction_max 0.403
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            1317
_diffrn_reflns_point_group_measured_fraction_full 0.381
_diffrn_reflns_point_group_measured_fraction_max 0.381
_diffrn_reflns_theta_full        23.253
_diffrn_reflns_theta_max         23.253
_diffrn_reflns_theta_min         3.470
_diffrn_source                   'microfocus sealed X-ray tube'
_diffrn_source_type              'Incoatec I\ms'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.112
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.5291
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.0951 before and 0.0476 after correction. The Ratio of minimum to maximum transmission is 0.7098. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            'clear colourless'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.508
_exptl_crystal_description       block
_exptl_crystal_F_000             144
_exptl_crystal_recrystallization_method
'Crystals loaded into a diamond anvil cell and 1.3 GPa pressure applied. Growth of new solid form (not present form) was observed after 8 hours. Annealling this solid reduced the pressure to 0.8 GPa and the delta form.'
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.091
_refine_diff_density_min         -0.073
_refine_diff_density_rms         0.020
_refine_ls_abs_structure_details
;
 Flack x determined using 129 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   1.5(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     81
_refine_ls_number_reflns         333
_refine_ls_number_restraints     71
_refine_ls_restrained_S_all      0.938
_refine_ls_R_factor_all          0.0334
_refine_ls_R_factor_gt           0.0276
_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^)+(0.0341P)^2^+0.0695P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0628
_refine_ls_wR_factor_ref         0.0644
_reflns_Friedel_coverage         0.881
_reflns_Friedel_fraction_full    0.359
_reflns_Friedel_fraction_max     0.359
_reflns_number_gt                300
_reflns_number_total             333
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8ce01882k2.cif
_cod_data_source_block           mo_paba_anneal_151018_0m
_cod_depositor_comments
'Adding full bibliography for 7232195--7232199.cif.'
_cod_database_code               7232196
_shelx_shelxl_version_number     2016/6
_shelx_estimated_absorpt_t_max   0.998
_shelx_estimated_absorpt_t_min   0.978
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All N(H,H) groups
 At 1.5 times of:
  All O(H) groups
2. Rigid body (RIGU) restrains
 All non-hydrogen atoms
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
3.a Rotating group:
 N1(H1A,H1B)
3.b Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C5(H5), C6(H6)
3.c Fitted hexagon refined as free rotating group:
 C2(C3,C4,C5,C6,C1)
3.d Idealised tetrahedral OH refined as rotating group:
 O1(H1)
;
_olex2_submission_special_instructions 'No special instructions were received'