Trimorphism of 2,2'-dipyridylamine: structures, phase transitions and thermodynamic stabilities
Schödel, H.; Näther, C.; Bock, H.; Butenschön, F.; Acta Crystallographica Section B 52 (1996) 842–853; doi:10.1107/S0108768196004624

data_2101615
_publ_section_title
;
 Trimorphism of 2,2'-dipyridylamine: structures, phase transitions and
 thermodynamic stabilities
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              842
_journal_page_last               853
_journal_paper_doi               10.1107/S0108768196004624
_journal_volume                  52
_journal_year                    1996
_chemical_formula_sum            'C10 H9 N3'
_chemical_formula_weight         171.20
_chemical_melting_point          370
_chemical_name_common            dipyridylamine
_chemical_name_systematic
;
 2,2'-dipyridylamine
;
_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'
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 98.880(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   9.0010(10)
_cell_length_b                   8.2620(10)
_cell_length_c                   24.2340(10)
_cell_measurement_reflns_used    46
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      20
_cell_measurement_theta_min      7
_cell_volume                     1780.6(3)
_computing_cell_refinement       'XSCANS 2.10'
_computing_data_collection       'XSCANS 2.10'
_computing_data_reduction        'XSCANS 2.10'
_computing_molecular_graphics    SHELXL-PC/XP
_computing_publication_material  CIFTAB
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1985)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       \w
_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  0.0202
_diffrn_reflns_av_sigmaI/netI    0.0345
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            3563
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.70
_diffrn_standards_decay_%        <1
_diffrn_standards_interval_count 400
_diffrn_standards_number         4
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.277
_exptl_crystal_description       prism
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.62
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.44
_refine_diff_density_max         0.113
_refine_diff_density_min         -0.132
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.032
_refine_ls_goodness_of_fit_obs   1.062
_refine_ls_hydrogen_treatment    'See text'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     243
_refine_ls_number_reflns         3100
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.080
_refine_ls_restrained_S_obs      1.062
_refine_ls_R_factor_all          0.0659
_refine_ls_R_factor_obs          0.0401
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0373P)^2^+0.3432P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1058
_refine_ls_wR_factor_obs         0.0876
_reflns_number_observed          2260
_reflns_number_total             3101
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            se0195.cif
_cod_data_source_block           RT
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '370 K' was changed to '370' - 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 '370 K' was changed to '370' - 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^)+(0.0373P)^2^+0.3432P] 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^)+(0.0373P)^2^+0.3432P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2101615