<i>p</i>-Diisocyanotetramethylbenzene
Zeller, Matthias; Hunter, Allen D.; Perrine, Cynthia L.; Acta Crystallographica Section E 59 (2003) o1655–o1656; doi:10.1107/S1600536803020087

data_2202647
_publ_section_title
;
 <i>p</i>-Diisocyanotetramethylbenzene
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1655
_journal_page_last               o1656
_journal_paper_doi               10.1107/S1600536803020087
_journal_volume                  59
_journal_year                    2003
_chemical_formula_moiety         'C12 H12 N2'
_chemical_formula_sum            'C12 H12 N2'
_chemical_formula_weight         184.24
_chemical_name_common            '1,4-bisisocyano-2,3,5,6-tetramethyl benzene'
_chemical_name_systematic        '1,4-bisisocyano-2,3,5,6-tetramethyl benzene'
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 112.010(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.1518(17)
_cell_length_b                   5.1324(5)
_cell_length_c                   12.3670(12)
_cell_measurement_reflns_used    4202
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.3175
_cell_measurement_theta_min      2.5615
_cell_volume                     1009.32(17)
_computing_cell_refinement       'SAINT-Plus (Bruker 1997-1999)'
_computing_data_collection       'SMART (Bruker 1997-2000)'
_computing_data_reduction        SAINT-Plus
_computing_molecular_graphics    SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0803
_diffrn_reflns_av_sigmaI/netI    0.0443
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            4935
_diffrn_reflns_theta_full        28.32
_diffrn_reflns_theta_max         28.32
_diffrn_reflns_theta_min         3.52
_diffrn_standards_decay_%        stable
_diffrn_standards_number         no
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.221
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.35
_refine_diff_density_max         0.324
_refine_diff_density_min         -0.268
_refine_ls_extinction_coef       0.011(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     69
_refine_ls_number_reflns         1257
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0475
_refine_ls_R_factor_gt           0.0461
_refine_ls_shift/su_max          0.016
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0698P)^2^+0.6662P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1297
_refine_ls_wR_factor_ref         0.1312
_reflns_number_gt                1181
_reflns_number_total             1257
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            fl6059.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2202647