A second monoclinic modification of phenyl quinoxalin-2-yl ether
Abdullah, Zanariah; Ng, Seik Weng; Acta Crystallographica Section E 64 (2008) o2165–; doi:10.1107/S1600536808031243

data_2219899
_publ_section_title
;
 A second monoclinic modification of phenyl quinoxalin-2-yl ether
;
_journal_coeditor_code           IM2084
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2165
_journal_paper_doi               10.1107/S1600536808031243
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C14 H10 N2 O'
_chemical_formula_moiety         'C14 H10 N2 O'
_chemical_formula_sum            'C14 H10 N2 O'
_chemical_formula_weight         222.24
_chemical_name_systematic
;
phenyl quinoxalin-2-yl ether
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 91.9830(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.9447(2)
_cell_length_b                   6.51690(10)
_cell_length_c                   20.2992(5)
_cell_measurement_reflns_used    2712
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.4
_cell_measurement_theta_min      2.7
_cell_volume                     1050.36(4)
_computing_cell_refinement       'SAINT (Bruker, 2007)'
_computing_data_collection       'APEX2 or SMART? (Bruker, 2007)'
_computing_data_reduction        'SAINT (Bruker, 2007)'
_computing_molecular_graphics    'X-SEED (Barbour, 2001)'
_computing_publication_material  'publCIF (Westrip, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Bruker SMART APEX'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0214
_diffrn_reflns_av_sigmaI/netI    0.0227
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            7016
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.01
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.405
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             464
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.334
_refine_diff_density_min         -0.233
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     154
_refine_ls_number_reflns         2398
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0469
_refine_ls_R_factor_gt           0.0370
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0648P)^2^+0.2602P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1056
_refine_ls_wR_factor_ref         0.1144
_reflns_number_gt                1960
_reflns_number_total             2398
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            im2084.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2219899
_cod_database_fobs_code          2219899