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_7203885
_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            'C21 H19 N O2'
_chemical_formula_weight         317.37
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.2290(18)
_cell_length_b                   9.6725(18)
_cell_length_c                   18.700(3)
_cell_measurement_reflns_used    3306
_cell_measurement_temperature    160(2)
_cell_measurement_theta_max      23.51
_cell_measurement_theta_min      2.18
_cell_volume                     1669.3(5)
_computing_cell_refinement       'local programs'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_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  0.0472
_diffrn_reflns_av_sigmaI/netI    0.0576
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            8809
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         2.18
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.263
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.226
_refine_diff_density_min         -0.234
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   4(3)
_refine_ls_extinction_coef       0.028(4)
_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   1.035
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     264
_refine_ls_number_reflns         2939
_refine_ls_number_restraints     10
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0976
_refine_ls_R_factor_gt           0.0598
_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^)+(0.0793P)^2^+0.2422P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1385
_refine_ls_wR_factor_ref         0.1575
_reflns_number_gt                1964
_reflns_number_total             2939
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            a906755h.txt
_cod_data_source_block           1d
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7203885