Orientation-dependent conformational polymorphs in two similar pyridine/pyrazine phenolic esters
Samie, Ali; Salimi, Alireza; CrystEngComm 21 (2019) 3721–; doi:10.1039/C8CE02107D

data_7232857
_publ_section_title
;
 Orientation-dependent conformational polymorphs in two similar
 pyridine/pyrazine phenolic esters
;
_journal_issue                   24
_journal_name_full               CrystEngComm
_journal_page_first              3721
_journal_paper_doi               10.1039/C8CE02107D
_journal_volume                  21
_journal_year                    2019
_chemical_formula_moiety         'C11 H8 N2 O2'
_chemical_formula_sum            'C11 H8 N2 O2'
_chemical_formula_weight         200.19
_chemical_melting_point          364.6
_chemical_name_common            IIa
_chemical_name_systematic
;
 Phenyl pyrazine-2-carboxylate (IIa)
;
_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-2013
_audit_update_record
;
2018-12-12 deposited with the CCDC.    2019-06-03 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.767(5)
_cell_length_b                   10.249(9)
_cell_length_c                   16.039(14)
_cell_measurement_reflns_used    3898
_cell_measurement_temperature    138(2)
_cell_measurement_theta_max      33.8
_cell_measurement_theta_min      2.4
_cell_volume                     948.0(14)
_computing_cell_refinement
'CrystalClear-SM Expert 2.0 rc14 (Rigaku, 2009)'
_computing_data_collection
'CrystalClear-SM Expert 2.0 rc14 (Rigaku, 2009)'
_computing_data_reduction
'CrystalClear-SM Expert 2.0 rc14 (Rigaku, 2009)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      138(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku Mercury375R (2x2 bin mode)'
_diffrn_measurement_method       'profile data from \w-scans'
_diffrn_radiation_monochromator  'Graphite Monochromator'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.2091
_diffrn_reflns_av_unetI/netI     0.1150
_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       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            9710
_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         26.999
_diffrn_reflns_theta_min         2.358
_exptl_absorpt_coefficient_mu    0.099
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.682
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   Multi-scan
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.403
_exptl_crystal_description       block
_exptl_crystal_F_000             416
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: hexane and ethyl acetate'
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.370
_refine_diff_density_min         -0.209
_refine_diff_density_rms         0.070
_refine_ls_abs_structure_details
;
 Flack x determined using 797 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   -0.5(10)
_refine_ls_extinction_coef       0.089(16)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.063
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         2066
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.0572
_refine_ls_R_factor_gt           0.0565
_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^)+(0.0499P)^2^+0.0156P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1271
_refine_ls_wR_factor_ref         0.1281
_reflns_Friedel_coverage         0.688
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     1.000
_reflns_number_gt                2013
_reflns_number_total             2066
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8ce02107d2.cif
_cod_data_source_block           IIa
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' according to
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4973 2017-02-22 13:04:09Z antanas 

 Adding full bibliography for 7232857--7232860.cif.
;
_cod_database_code               7232857
_shelxl_version_number           2013-4
_shelx_res_checksum              64691