C20H24N4
Bell, Norman A.; Light, Mark E.; Hursthouse, Michael B.; Crystal Structure Report Archive  (2000) 736–; doi:

data_1519259
_publ_section_title
;
 C20H24N4
;
_journal_name_full               'Crystal Structure Report Archive'
_journal_page_first              736
_journal_year                    2000
_chemical_formula_sum            'C20 H24 N4'
_chemical_formula_weight         320.43
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                95.5550(10)
_cell_angle_beta                 101.9900(10)
_cell_angle_gamma                104.5180(10)
_cell_formula_units_Z            4
_cell_length_a                   8.71760(10)
_cell_length_b                   13.4265(2)
_cell_length_c                   16.1511(4)
_cell_measurement_reflns_used    7201
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.91
_cell_volume                     1767.88(6)
_computing_cell_refinement       'DENZO and COLLECT'
_computing_data_collection
;
'DENZO (Otwinowski and Minor, 1997) & COLLECT (Hooft, 1998) '
;
_computing_data_reduction        'DENZO and COLLECT'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Enraf Nonius KappaCCD area detector'
_diffrn_measurement_method       '\w and \f scans to fill Ewald sphere'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enraf Nonius FR591 rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0434
_diffrn_reflns_av_sigmaI/netI    0.0586
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            17542
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         3.02
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9891
_exptl_absorpt_correction_T_min  0.9784
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SORTAV (R.H. Blessing, 1995, 1997)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             688
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.163
_refine_diff_density_min         -0.188
_refine_diff_density_rms         0.038
_refine_ls_extinction_coef       0.0144(14)
_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   0.992
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     626
_refine_ls_number_reflns         6236
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.992
_refine_ls_R_factor_all          0.0671
_refine_ls_R_factor_gt           0.0408
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0551P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0940
_refine_ls_wR_factor_ref         0.1062
_reflns_number_gt                4400
_reflns_number_total             6236
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            eCrystal-736.cif
_cod_data_source_block           s92
_cod_depositor_comments
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Citation :
Bell, Norman A. and Light, Mark E. and Hursthouse, Michael B. (2000) 
University of Southampton, Crystal Structure Report Archive. 

More at:
http://ecrystals.chem.soton.ac.uk/736/

The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

'_exptl_absorpt_correction_type' value 'Empirical' changed to
'empirical' according to the built-in table from CIF Core dictionary
named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 3105 2015-03-04 15:46:00Z robertas 
;
_cod_original_cell_volume        1767.88(5)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               1519259