4-Tritylbenzoic acid. A molecular scaffold for wheel-and-axle host‒guest inclusion compounds with a supramolecular axis
Jetti, Ram K. R.; Xue, Feng; Mak, Thomas C. W.; Nangia, Ashwini; Journal of the Chemical Society, Perkin Transactions 2  (2000) 1223–; doi:10.1039/a909827e

data_7213239
_publ_section_title
;
 4-Tritylbenzoic acid. A molecular scaffold for wheel-and-axle host--guest
 inclusion compounds with a supramolecular axis
;
_journal_issue                   6
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              1223
_journal_paper_doi               10.1039/a909827e
_journal_year                    2000
_chemical_formula_moiety         '(C26 H20 O2). 0.5(C8 H10)'
_chemical_formula_sum            'C30 H25 O2'
_chemical_formula_weight         417.50
_chemical_melting_point          519.15
_chemical_name_common
'4-(triphenylmethyl)benzoic acid m-xylene clathrate '
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                88.54(1)
_cell_angle_beta                 85.33(1)
_cell_angle_gamma                67.63(1)
_cell_formula_units_Z            2
_cell_length_a                   7.329(1)
_cell_length_b                   9.044(1)
_cell_length_c                   18.547(1)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      15
_cell_measurement_theta_min      5
_cell_volume                     1133.1(2)
_computing_cell_refinement       'MSC/AFC Diffractometer Control'
_computing_data_collection       'MSC/AFC Diffractometer Control'
_computing_data_reduction        'MSC/AFC Diffractometer Control'
_computing_molecular_graphics    'Siemens SHELXTL-PC'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Rigaku AFC7R'
_diffrn_measurement_method       '\w scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source
;
Rigaku RU-200 rotating-anode generator powered at 50kV and 90mA
;
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0264
_diffrn_reflns_av_sigmaI/netI    0.0593
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       0
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            4258
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         2.20
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.970
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.379
_exptl_crystal_description       Plate
_exptl_crystal_F_000             500
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.312
_refine_diff_density_min         -0.228
_refine_diff_density_rms         0.043
_refine_ls_extinction_coef       0.0310(47)
_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_all   1.023
_refine_ls_goodness_of_fit_obs   1.133
_refine_ls_matrix_type           full
_refine_ls_number_parameters     299
_refine_ls_number_reflns         3976
_refine_ls_number_restraints     218
_refine_ls_restrained_S_all      1.014
_refine_ls_restrained_S_obs      1.086
_refine_ls_R_factor_all          0.1199
_refine_ls_R_factor_obs          0.0519
_refine_ls_shift/esd_max         -0.003
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0941P)^2^+0.1520P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1925
_refine_ls_wR_factor_obs         0.1473
_reflns_number_observed          2061
_reflns_number_total             3982
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            a909827esup1.cif
_cod_data_source_block           5.m-xylene
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '246 deg C ' was changed to '519.15'
- it was converted from degrees Celsius(C) to
Kelvins(K).

'_symmetry_cell_setting' value 'Triclinic' changed to
'triclinic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from
2011-04-26.

'_exptl_absorpt_correction_type' value 'Empirical'
changed to 'empirical' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0941P)^2^+0.1520P] 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^)+(0.0941P)^2^+0.1520P] 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-1
_cod_original_formula_sum        '(C26 H20 O2). 0.5(C8 H10) '
_cod_database_code               7213239