The role of 1,2,4,5-tetrazine rings in π–π stacking interactions
Oxtoby, Neil S.; Blake, Alexander J.; Champness, Neil R.; Wilson, Claire; CrystEngComm 5 (2003) 82–; doi:10.1039/b302187d

data_7204617
_publ_section_title
;
 The role of 1,2,4,5-tetrazine rings in \p--\p stacking interactions
;
_journal_issue                   17
_journal_name_full               CrystEngComm
_journal_page_first              82
_journal_paper_doi               10.1039/b302187d
_journal_volume                  5
_journal_year                    2003
_chemical_formula_moiety         'C12 H8 N6'
_chemical_formula_sum            'C12 H8 N6'
_chemical_formula_weight         236.24
_chemical_name_common            3,6-Di-4-pyridyl-1,2,4,5-tetrazine
_chemical_name_systematic
; 
3,6-Di-4-pyridyl-1,2,4,5-tetrazine
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   'difference Fourier synthesis'
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.776(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.0029(9)
_cell_length_b                   5.4035(10)
_cell_length_c                   18.788(4)
_cell_measurement_reflns_used    1173
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.15
_cell_measurement_theta_min      3.9
_cell_volume                     507.30(17)
_computing_cell_refinement       'Bruker SAINT version 6.02a (Bruker, 2000)'
_computing_data_collection       'Bruker SMART version 5.054 (Bruker, 1998)'
_computing_data_reduction        'Bruker SAINT; Bruker SHELXTL (Bruker, 1997)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'SHELXL-97; PLATON (Spek, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.965
_diffrn_measured_fraction_theta_max 0.893
_diffrn_measurement_device_type  'Bruker SMART1000 CCD area detector'
_diffrn_measurement_method       omega
_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  0.041
_diffrn_reflns_av_sigmaI/netI    0.024
_diffrn_reflns_limit_h_max       4
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            2799
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         28.57
_diffrn_reflns_theta_min         2.17
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            pink
_exptl_crystal_density_diffrn    1.547
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'hexagonal plate'
_exptl_crystal_F_000             244
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.44
_refine_diff_density_min         -0.19
_refine_diff_density_rms         0.06
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.033
_refine_ls_hydrogen_treatment    'riding model'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     82
_refine_ls_number_reflns         1155
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0583
_refine_ls_R_factor_gt           0.0439
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0845P)^2^+0.0399P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1202
_refine_ls_wR_factor_ref         0.1303
_reflns_number_gt                888
_reflns_number_total             1273
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b302187d.txt
_cod_data_source_block           DPTZNT
_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.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0845P)^2^+0.0399P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0845P)^2^+0.0399P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 

The following automatic conversions were performed:

'_atom_sites_solution_primary' value 'direct methods' was changed to
'direct'.

'_atom_sites_solution_hydrogens' value 'geometrically placed' was
changed to 'geom'.

Automatic conversion script
Id: cif_fix_values 6452 2018-10-05 10:23:21Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7204617