Competition between Methoxy-Based and Pyrazine-Based Synthons in Methoxy-Substituted Distyrylpyrazines
Collas, Alain; Bagrowska, Izabela; Aleksandrzak, Krzysztof; Zeller, Matthias; Blockhuys, Frank; Crystal Growth & Design 11 (2011) 1299–; doi:10.1021/cg101523f

data_4500415
_publ_section_title
;
 Competition between Methoxy-Based and Pyrazine-Based Synthons in
 Methoxy-Substituted Distyrylpyrazines
;
_journal_issue                   4
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              1299
_journal_paper_doi               10.1021/cg101523f
_journal_volume                  11
_journal_year                    2011
_chemical_formula_moiety         'C24 H24 N2 O4'
_chemical_formula_sum            'C24 H24 N2 O4'
_chemical_formula_weight         404.45
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.938(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   14.118(3)
_cell_length_b                   9.424(2)
_cell_length_c                   7.8733(18)
_cell_measurement_reflns_used    845
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      22.0944
_cell_measurement_theta_min      2.5978
_cell_volume                     1047.4(4)
_computing_cell_refinement       'Apex2 v2008.2-4'
_computing_data_collection       'Apex2 v2008.2-4 (Bruker, 2008)'
_computing_data_reduction        'Apex2 v2008.2-4'
_computing_molecular_graphics
'ORTEP (Farrugia, 1997) and Mercury (Macrae <I>et al.</I>, 2008)'
_computing_publication_material
'WINGX (Farrugia, 1999) and PLATON (Spek, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.984
_diffrn_measured_fraction_theta_max 0.984
_diffrn_measurement_device_type  'Bruker AXS SMART APEX CCD diffractometer'
_diffrn_measurement_method       '\w scans'
_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  0.0310
_diffrn_reflns_av_sigmaI/netI    0.0497
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            5406
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.60
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.960
_exptl_absorpt_correction_T_min  0.825
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Apex2 v2008.2-4 (Bruker, 2008)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.282
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             428
_exptl_crystal_size_max          0.70
_exptl_crystal_size_mid          0.52
_exptl_crystal_size_min          0.46
_refine_diff_density_max         0.186
_refine_diff_density_min         -0.163
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     138
_refine_ls_number_reflns         2566
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.1170
_refine_ls_R_factor_gt           0.0612
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0660P)^2^+0.0637P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1413
_refine_ls_wR_factor_ref         0.1740
_reflns_number_gt                1352
_reflns_number_total             2566
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            cg101523f_si_003.cif
_cod_data_source_block           pol234mdsp_0m
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4500415