On polymorphism and planarity of benzidine dihydrochloride
Łukasz Dobrzycki; Krzysztof Woźniak; CrystEngComm 8 (2006) 780–; doi:10.1039/b612605g

data_7203651
_publ_section_title
;
 On polymorphism and planarity of benzidine dihydrochloride
;
_journal_issue                   11
_journal_name_full               CrystEngComm
_journal_page_first              780
_journal_paper_doi               10.1039/b612605g
_journal_volume                  8
_journal_year                    2006
_chemical_formula_sum            'C12 H14 Cl2 N2'
_chemical_formula_weight         257.15
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   27.459(3)
_cell_length_b                   6.0877(8)
_cell_length_c                   7.3074(10)
_cell_measurement_temperature    293(2)
_cell_volume                     1221.5(3)
_computing_cell_refinement
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.28cycle2 beta (release 25-10-2005 CrysAlis171 .NET)
(compiled Oct 25 2005,08:50:05)
;
_computing_data_collection
;
CrysAlis CCD, Oxford Diffraction Ltd.,
Version 1.171.28cycle2 beta (release 25-10-2005 CrysAlis171 .NET)
(compiled Oct 25 2005,08:50:05)
;
_computing_data_reduction
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.28cycle2 beta (release 25-10-2005 CrysAlis171 .NET)
(compiled Oct 25 2005,08:50:05)
;
_computing_molecular_graphics    Diamond
_computing_publication_material  SHELXTL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 8.6479
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  KM4CCD
_diffrn_measurement_method       'omega scan'
_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  0.0302
_diffrn_reflns_av_sigmaI/netI    0.0118
_diffrn_reflns_limit_h_max       38
_diffrn_reflns_limit_h_min       -38
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            39654
_diffrn_reflns_theta_full        29.97
_diffrn_reflns_theta_max         29.97
_diffrn_reflns_theta_min         2.97
_diffrn_standards_decay_%        2
_diffrn_standards_number         '1 frame'
_exptl_absorpt_coefficient_mu    0.505
_exptl_absorpt_correction_T_max  0.97
_exptl_absorpt_correction_T_min  0.76
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.28cycle2 beta (release 25-10-2005 CrysAlis171 .NET)
(compiled Oct 25 2005,08:50:05)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.398
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             536
_exptl_crystal_size_max          0.78
_exptl_crystal_size_mid          0.43
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.272
_refine_diff_density_min         -0.289
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.101
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         1783
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.101
_refine_ls_R_factor_all          0.0571
_refine_ls_R_factor_gt           0.0397
_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^)+(0.0727P)^2^+0.4919P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1313
_refine_ls_wR_factor_ref         0.1465
_reflns_number_gt                1231
_reflns_number_total             1783
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b612605g.txt
_cod_data_source_block           2_293
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 
;
_cod_original_sg_symbol_H-M      Pbcn
_cod_database_code               7203651