Pseudomerohedral twinning, pseudosymmetry and complex hydrogen-bonded sheets in 2-methoxy-4-(pyrrolo[1,2-<i>a</i>]quinoxalin-4-yl)phenol
Castillo, Juan C.; Abonía, Rodrigo; Cobo, Justo; Glidewell, Christopher; Acta Crystallographica Section C 66 (2010) o385–o388; doi:10.1107/S0108270110023152

data_2017763
_publ_section_title
;
 Pseudomerohedral twinning, pseudosymmetry and complex hydrogen-bonded
 sheets in 2-methoxy-4-(pyrrolo[1,2-<i>a</i>]quinoxalin-4-yl)phenol
;
_journal_coeditor_code           SK3375
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o385
_journal_page_last               o388
_journal_paper_doi               10.1107/S0108270110023152
_journal_volume                  66
_journal_year                    2010
_chemical_formula_iupac          'C18 H14 N2 O2'
_chemical_formula_moiety         'C18 H14 N2 O2'
_chemical_formula_sum            'C18 H14 N2 O2'
_chemical_formula_weight         290.31
_chemical_name_systematic
;
2-methoxy-4-(pyrrolo[1,2-<i>a</i>]quinoxalin-4-yl)phenol
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.326(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.9278(8)
_cell_length_b                   15.2929(18)
_cell_length_c                   22.410(4)
_cell_measurement_reflns_used    6234
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      2.81
_cell_volume                     2716.9(6)
_computing_cell_refinement       'DIRAX/LSQ (Duisenberg <i>et al.</i>,  2000)'
_computing_data_collection       'COLLECT (Nonius, 1999)'
_computing_data_reduction        'EVALCCD (Duisenberg <i>et al.</i>,  2003)'
_computing_molecular_graphics    'PLATON (Spek, 2009)'
_computing_publication_material
;
SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009)
;
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR2004 (Burla <i>et al.</i>,  2005)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Nonius KappaCCD area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker Nonius FR591 rotating anode'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0610
_diffrn_reflns_av_sigmaI/netI    0.0407
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            34020
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.81
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.983
_exptl_absorpt_correction_T_min  0.944
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.419
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1216
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.269
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     400
_refine_ls_number_reflns         5057
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0777
_refine_ls_R_factor_gt           0.0528
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0848P)^2^+1.9308P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1391
_refine_ls_wR_factor_ref         0.1592
_reflns_number_gt                3891
_reflns_number_total             5057
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3375.cif
_cod_data_source_block           Im
_cod_original_cell_volume        2717.0(6)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2017763
_cod_database_fobs_code          2017763