C10H8Cl2N4
Blake, Alexander J.; Light, Mark E.; Hursthouse, Michael B.; Crystal Structure Report Archive  (1997) 1206–; doi:

data_1519180
_publ_section_title
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 C10H8Cl2N4
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_journal_name_full               'Crystal Structure Report Archive'
_journal_page_first              1206
_journal_year                    1997
_chemical_formula_moiety         'C10 H8 Cl2 N4'
_chemical_formula_sum            'C10 H8 Cl2 N4'
_chemical_formula_weight         255.10
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.2300(10)
_cell_length_b                   15.594(3)
_cell_length_c                   19.618(4)
_cell_measurement_temperature    120(2)
_cell_volume                     2211.8(7)
_computing_cell_refinement       REFINE
_computing_data_collection       'MADNES (Pflugrath & Messerschmidt, 1989)'
_computing_data_reduction        'ABSURD (Karaulov, 1992)'
_computing_publication_material  SHELXL97
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution
'SIR92 (Altomare, Cascarano, Giacovazzo & Guaglitardi, 1993)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.873
_diffrn_measured_fraction_theta_max 0.873
_diffrn_measurement_device_type  'Delft instruments FAST area detector'
_diffrn_measurement_method
'Intensity measurements as described by Darr, Drake, Hursthouse & Malik (1993)'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode generator'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0964
_diffrn_reflns_av_sigmaI/netI    0.1387
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            8212
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.08
_exptl_absorpt_coefficient_mu    0.562
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            unk
_exptl_crystal_density_diffrn    1.532
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       unk
_exptl_crystal_F_000             1040
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.377
_refine_diff_density_min         -0.515
_refine_diff_density_rms         0.099
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.903
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     177
_refine_ls_number_reflns         1704
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.903
_refine_ls_R_factor_all          0.0815
_refine_ls_R_factor_gt           0.0443
_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^)+(0.0392P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1025
_refine_ls_wR_factor_ref         0.1083
_reflns_number_gt                1062
_reflns_number_total             1704
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            eCrystal-1206.cif
_cod_data_source_block           s92
_cod_depositor_comments
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Citation :
Blake, Alexander J. and Light, Mark E. and Hursthouse, Michael B. (1997) 
University of Southampton, Crystal Structure Report Archive. 
(doi:10.5258/ecrystals/1206)

More at:
http://ecrystals.chem.soton.ac.uk/1206/
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_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               1519180