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_7213245
_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(C6 H5 N O2)'
_chemical_formula_sum            'C29 H22.5 N0.5 O3'
_chemical_formula_weight         425.98
_chemical_melting_point          541.15
_chemical_name_common
'4-(triphenylmethyl)benzoic acid nitrobenzene 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-97
_cell_angle_alpha                89.33(3)
_cell_angle_beta                 86.14(3)
_cell_angle_gamma                67.55(3)
_cell_formula_units_Z            2
_cell_length_a                   7.340(2)
_cell_length_b                   8.982(2)
_cell_length_c                   18.366(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      8.36
_cell_measurement_theta_min      4.56
_cell_volume                     1116.4(5)
_computing_cell_refinement       'MSC/AFC Diffractometer Control'
_computing_data_collection       'MSC/AFC Diffractometer Control'
_computing_data_reduction        'MSC/AFC Diffractometer Control'
_computing_molecular_graphics    'XP in SHELXTL-PC (Siemens, 1990)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Rigaku AFC7R'
_diffrn_measurement_method       '\w scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source
;
Rigaku RU-200 rotating-anode generator powered at 50kV / 90mA
;
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0220
_diffrn_reflns_av_sigmaI/netI    0.0554
_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       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            4165
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.71
_diffrn_standards_decay_%        -0.32
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.946
_exptl_absorpt_correction_type   psi-scan
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.267
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             448
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.916
_refine_diff_density_min         -0.408
_refine_diff_density_rms         0.099
_refine_ls_extinction_coef       0.021(10)
_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   1.078
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     308
_refine_ls_number_reflns         3895
_refine_ls_number_restraints     296
_refine_ls_restrained_S_all      1.087
_refine_ls_R_factor_all          0.1446
_refine_ls_R_factor_gt           0.0905
_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^)+(0.1980P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2718
_refine_ls_wR_factor_ref         0.2924
_reflns_number_gt                2393
_reflns_number_total             3895
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            a909827esup1.cif
_cod_data_source_block           5.Ph-NO2
_cod_depositor_comments
;
The following automatic conversions were performed:
'_atom_site_symetry_multiplicity' tag replaced with
'_atom_site_symmetry_multiplicity'.

Automatic conversion script
Id: cif_correct_tags 1440 2010-10-19 06:21:57Z saulius 

The following automatic conversions were performed:

'_chemical_melting_point' value '268 deg C ' was changed to '541.15'
- 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 'PSI scan'
changed to 'psi-scan' 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 
;
_cod_original_cell_volume        1116.4(4)
_cod_original_sg_symbol_H-M      P-1
_cod_original_formula_sum        '(C26 H20 O2). 0.5(C6 H5 N O2)  '
_cod_database_code               7213245