1,5-Dimethyl-1,2,4,5-tetrazinane-3,6-dione
Mills, Allison M.; Wu, Jian-Zhong; Bouwman, Elisabeth; Reedijk, Jan; Spek, Anthony L.; Acta Crystallographica Section E 60 (2004) o2485–o2487; doi:10.1107/S1600536804030557

data_2204792
_publ_section_title
;
 1,5-Dimethyl-1,2,4,5-tetrazinane-3,6-dione
;
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2485
_journal_page_last               o2487
_journal_paper_doi               10.1107/S1600536804030557
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C4 H8 N4 O2'
_chemical_formula_moiety         'C4 H8 N4 O2'
_chemical_formula_sum            'C4 H8 N4 O2'
_chemical_formula_weight         144.14
_chemical_name_systematic
;
1,5-Dimethyl-1,2,4,5-tetrazinane-3,6-dione
;
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 91.4690(16)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.6861(3)
_cell_length_b                   10.8182(4)
_cell_length_c                   7.8238(3)
_cell_measurement_reflns_used    5956
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.46
_cell_measurement_theta_min      1.02
_cell_volume                     650.33(4)
_computing_cell_refinement       'HKL2000 (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1998)'
_computing_data_reduction        HKL2000
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  PLATON
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0463
_diffrn_reflns_av_sigmaI/netI    0.0345
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            6507
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         2.65
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.120
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.472
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             304
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.202
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     132
_refine_ls_number_reflns         1482
_refine_ls_number_restraints     32
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0549
_refine_ls_R_factor_gt           0.0384
_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^)+(0.0585P)^2^+0.0925P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0995
_refine_ls_wR_factor_ref         0.1098
_reflns_number_gt                1146
_reflns_number_total             1482
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            rz6023.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2204792
_cod_database_fobs_code          2204792