Preparations, X-ray crystal structure determinations, and base strength measurements of substituted tritylamines
Moisés Canle L.; William Clegg; Ibrahim Demirtas; Mark R. J. Elsegood; Howard Maskill; J. Chem. Soc., Perkin Trans. 2  (2000) 85–92; doi:10.1039/a906755h

data_7203886
_publ_section_title
;
 Preparations, X-ray crystal structure determinations, and base
 strength measurements of substituted tritylamines
;
_journal_issue                   1
_journal_name_full               'J. Chem. Soc., Perkin Trans. 2'
_journal_page_first              85
_journal_page_last               92
_journal_paper_doi               10.1039/a906755h
_journal_year                    2000
_chemical_formula_sum            'C22 H23 N O3'
_chemical_formula_weight         349.41
_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'
_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                 102.780(17)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   10.497(2)
_cell_length_b                   18.498(2)
_cell_length_c                   19.597(2)
_cell_measurement_reflns_used    44
_cell_measurement_temperature    160(2)
_cell_measurement_theta_max      24.94
_cell_measurement_theta_min      20.78
_cell_volume                     3711.0(9)
_computing_cell_refinement       'Stoe DIF4'
_computing_data_collection       'Stoe DIF4'
_computing_data_reduction        'local programs'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'SHELXTL and local programs'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      160(2)
_diffrn_measured_fraction_theta_full 0.969
_diffrn_measured_fraction_theta_max 0.969
_diffrn_measurement_device_type  'Stoe-Siemens diffractometer'
_diffrn_measurement_method       '\w/\q scans with on-line profile fitting'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0320
_diffrn_reflns_av_sigmaI/netI    0.0470
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            11167
_diffrn_reflns_theta_full        67.62
_diffrn_reflns_theta_max         67.62
_diffrn_reflns_theta_min         3.32
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  60
_diffrn_standards_number         5
_exptl_absorpt_coefficient_mu    0.664
_exptl_absorpt_correction_T_max  0.9488
_exptl_absorpt_correction_T_min  0.6222
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.251
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.79
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.227
_refine_diff_density_min         -0.184
_refine_diff_density_rms         0.041
_refine_ls_extinction_coef       0.00077(7)
_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   1.061
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     488
_refine_ls_number_reflns         6506
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0634
_refine_ls_R_factor_gt           0.0435
_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^)+(0.0346P)^2^+1.4193P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0969
_refine_ls_wR_factor_ref         0.1105
_reflns_number_gt                5007
_reflns_number_total             6506
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            a906755h.txt
_cod_data_source_block           4a
_cod_original_cell_volume        3710.9(10)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7203886