OH–π and halogen–π interactions as driving forces in the crystal organisations of tri-bromo and tri-iodo trityl alcohols
Schollmeyer, Dieter; Shishkin, Oleg V.; Rühl, Thomas; Vysotsky, Myroslav O.; CrystEngComm 10 (2008) 715–; doi:10.1039/b716442d

data_7201809
_publ_section_title
;
 OH--\p and halogen--\p interactions as driving forces in the crystal
 organisations of tri-bromo and tri-iodo trityl alcohols
;
_journal_issue                   6
_journal_name_full               CrystEngComm
_journal_page_first              715
_journal_paper_doi               10.1039/b716442d
_journal_volume                  10
_journal_year                    2008
_chemical_formula_moiety         'C19 H13 I3 O, C H2 Cl2'
_chemical_formula_sum            'C20 H15 Cl2 I3 O'
_chemical_formula_weight         722.92
_space_group_IT_number           39
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'A 2 -2b'
_symmetry_space_group_name_H-M   'A b m 2'
_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                   12.2182(4)
_cell_length_b                   20.4790(5)
_cell_length_c                   8.5939(2)
_cell_measurement_reflns_used    6423
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      27.8
_cell_measurement_theta_min      2.5
_cell_volume                     2150.34(10)
_computing_cell_refinement       'APEX2 V2.0 (Bruker, 2006)'
_computing_data_collection       'APEX2 V2.0 (Bruker, 2006)'
_computing_data_reduction        'APEX2 V2.0 (Bruker, 2006)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR-97 (Altomare, 1997)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'SMART CCD'
_diffrn_measurement_method       'CCD scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0272
_diffrn_reflns_av_sigmaI/netI    0.0254
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            9554
_diffrn_reflns_theta_full        27.86
_diffrn_reflns_theta_max         27.86
_diffrn_reflns_theta_min         1.67
_diffrn_source                   'sealed Tube'
_exptl_absorpt_coefficient_mu    4.617
_exptl_absorpt_correction_T_max  0.7692
_exptl_absorpt_correction_T_min  0.2596
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   Blessing
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.233
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1344
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.920
_refine_diff_density_min         -1.217
_refine_diff_density_rms         0.134
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.02(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     126
_refine_ls_number_reflns         2546
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0282
_refine_ls_R_factor_gt           0.0273
_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^)+(0.0462P)^2^+7.6243P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_obs         0.0751
_refine_ls_wR_factor_ref         0.0756
_reflns_number_gt                2462
_reflns_number_total             2546
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b716442d.txt
_cod_data_source_block           2C
_cod_original_sg_symbol_Hall     'A 2 -2c'
_cod_original_sg_symbol_H-M      'A bm2'
_cod_database_code               7201809