Trimethyl Isocyanurate and Triethyl Isocyanurate
Thalladi, Venkat R.; Katz, Amy K.; Carrell, H. L.; Nangia, Ashwini; Desiraju, Gautam R.; Acta Crystallographica Section C 54 (1998) 86–89; doi:10.1107/S010827019701384X

data_2006950
_publ_section_title
;
 Trimethyl Isocyanurate and Triethyl Isocyanurate
;
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              86
_journal_page_last               89
_journal_paper_doi               10.1107/S010827019701384X
_journal_volume                  54
_journal_year                    1998
_chemical_formula_moiety         'C6 H9 N3 O3'
_chemical_formula_sum            'C6 H9 N3 O3'
_chemical_formula_weight         171.155
_chemical_melting_point          449
_chemical_name_common            'Trimethyl isocyanurate'
_chemical_name_systematic
;
1,3,5-Trimethyl-1,3,5-triazine(1H,3H,5H)-2,4,6-trione
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yab'
_symmetry_space_group_name_H-M   'P 1 21/a 1'
_cell_angle_alpha                90.00
_cell_angle_beta                 100.88(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.1420(10)
_cell_length_b                   13.3930(10)
_cell_length_c                   14.8220(10)
_cell_measurement_reflns_used    50
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      2
_cell_volume                     1587.2(4)
_computing_cell_refinement       'CAD4 Software'
_computing_data_collection       'CAD4 Software (Enraf-Nonius, 1989)'
_computing_data_reduction        'CAD4 Software'
_computing_molecular_graphics
'ORTEP (Johnson, 1976) and PLUTO (Motherwell & Clegg, 1978)'
_computing_publication_material  SHELXL93
_computing_structure_refinement  'SHELXL93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Enraf-Nonius CAD4'
_diffrn_measurement_method       \w-2\q
_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  0.022
_diffrn_reflns_av_sigmaI/netI    0.0261
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            2754
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         2.07
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 100
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.433
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.241
_refine_diff_density_min         -0.188
_refine_ls_extinction_coef       0.058(5)
_refine_ls_extinction_method     SHELXL93
_refine_ls_goodness_of_fit_all   1.088
_refine_ls_goodness_of_fit_obs   1.211
_refine_ls_hydrogen_treatment    'H atoms riding'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         2508
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.088
_refine_ls_restrained_S_obs      1.211
_refine_ls_R_factor_all          0.074
_refine_ls_R_factor_obs          .053
_refine_ls_shift/esd_max         -0.007
_refine_ls_shift/esd_mean        0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0967P)^2^+0.3347P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.163
_refine_ls_wR_factor_obs         .152
_reflns_number_observed          1814
_reflns_number_total             2508
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            oa1038.cif
_cod_data_source_block           1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '449 K' was changed to '449' - the
value should be numeric and without a unit designator.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 

The following automatic conversions were performed:

'_chemical_melting_point' value '449 K' was changed to '449' - the
value should be numeric and without a unit designator.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc w =
1/[\s^2^(Fo^2^)+(0.0967P)^2^+0.3347P] 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^)+(0.0967P)^2^+0.3347P] where P = (Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1587.2(3)
_cod_original_sg_symbol_H-M      'P 21/a'
_cod_database_code               2006950