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_4500417
_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         'C26 H28 N2 O6'
_chemical_formula_sum            'C26 H28 N2 O6'
_chemical_formula_weight         464.50
_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                 117.533(19)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.040(2)
_cell_length_b                   10.806(4)
_cell_length_c                   15.268(5)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      16.52
_cell_measurement_theta_min      5.84
_cell_volume                     1176.3(7)
_computing_cell_refinement       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_collection       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1996)'
_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      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       '\w/2/q 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  0.1382
_diffrn_reflns_av_sigmaI/netI    0.1690
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            4503
_diffrn_reflns_theta_full        24.10
_diffrn_reflns_theta_max         25.61
_diffrn_reflns_theta_min         2.41
_diffrn_standards_decay_%        59
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.312
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             492
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.32
_refine_diff_density_max         0.480
_refine_diff_density_min         -0.236
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.933
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     157
_refine_ls_number_reflns         2164
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.933
_refine_ls_R_factor_all          0.2265
_refine_ls_R_factor_gt           0.0736
_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^)+(0.1245P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1847
_refine_ls_wR_factor_ref         0.2494
_reflns_number_gt                776
_reflns_number_total             2164
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            cg101523f_si_005.cif
_cod_data_source_block           new
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1176.2(7)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4500417