Role of hydrogen bonding in the formation of glasses by small molecules: a triazine case study
Wang, Ruiyao; Pellerin, Christian; Lebel, Olivier; Journal of Materials Chemistry 19 (2009) 2747–; doi:10.1039/b820294j

data_7200695
_publ_section_title
;
 Role of hydrogen bonding in the formation of glasses by small
 molecules: a triazine case study
;
_journal_issue                   18
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              2747
_journal_paper_doi               10.1039/b820294j
_journal_volume                  19
_journal_year                    2009
_chemical_formula_sum            'C20 H23 N5 O'
_chemical_formula_weight         349.43
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 94.301(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   14.389(6)
_cell_length_b                   18.111(8)
_cell_length_c                   15.870(7)
_cell_measurement_reflns_used    2258
_cell_measurement_temperature    180(2)
_cell_measurement_theta_max      21.02
_cell_measurement_theta_min      2.25
_cell_volume                     4124(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      180(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0955
_diffrn_reflns_av_sigmaI/netI    0.0742
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            19043
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.81
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9928
_exptl_absorpt_correction_T_min  0.9785
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.126
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.454
_refine_diff_density_min         -0.436
_refine_diff_density_rms         0.068
_refine_ls_extinction_coef       0.0042(8)
_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   1.028
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     234
_refine_ls_number_reflns         3636
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.1528
_refine_ls_R_factor_gt           0.0792
_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^)+(0.1054P)^2^+11.1566P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2006
_refine_ls_wR_factor_ref         0.2581
_reflns_number_gt                1906
_reflns_number_total             3636
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b820294j.txt
_cod_data_source_block           ol03a
_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 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7200695