<i>N</i>,<i>N</i>'-Bis(2-pyridylethyl)pyromellitic diimide
Lü, Xingqiang; Su, Chengyong; Kang, Beisheng; Ng, Seik Weng; Acta Crystallographica Section E 60 (2004) o566–o567; doi:10.1107/S1600536804005409

data_2203499
_publ_section_title
;
 <i>N</i>,<i>N</i>'-Bis(2-pyridylethyl)pyromellitic diimide
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o566
_journal_page_last               o567
_journal_paper_doi               10.1107/S1600536804005409
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C24 H18 N4 O4'
_chemical_formula_moiety         'C24 H18 N4 O4'
_chemical_formula_sum            'C24 H18 N4 O4'
_chemical_formula_weight         426.42
_chemical_name_systematic
;
N,N'-bis(2-pyridylethyl)pyromellitic diimide
;
_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                 93.422(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.2484(7)
_cell_length_b                   8.1250(10)
_cell_length_c                   23.398(3)
_cell_measurement_reflns_used    748
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      26.5
_cell_measurement_theta_min      2.7
_cell_volume                     996.0(2)
_computing_cell_refinement       'SAINT (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1999)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 1.00
_diffrn_measured_fraction_theta_max 1.00
_diffrn_measurement_device_type  'Bruker SMART area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'medium-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0227
_diffrn_reflns_av_sigmaI/netI    0.0264
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            6073
_diffrn_reflns_theta_full        27.0
_diffrn_reflns_theta_max         27.0
_diffrn_reflns_theta_min         1.7
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.100
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.422
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             444
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.13
_refine_diff_density_min         -0.26
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.03
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     145
_refine_ls_number_reflns         2171
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.03
_refine_ls_R_factor_all          0.069
_refine_ls_R_factor_gt           0.043
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0666P)^2^+0.0976P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.108
_refine_ls_wR_factor_ref         0.124
_reflns_number_gt                1469
_reflns_number_total             2171
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            su6084.cif
_cod_data_source_block           I
_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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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_enum 1527 2010-12-29 10:47:43Z saulius 

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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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_sg_symbol_H-M      'P 21/n'
_cod_database_code               2203499
_cod_database_fobs_code          2203499