Thermal motion of <i>tert</i>-butyl groups III. <i>tert</i>-Butyl substituents in aromatic hydrocarbons, the view from the bottom of the well
Frey, Joseph; Khan, Saeed I.; Knobler, Carolyn B.; Lightner, David A.; Maverick, Emily F.; Phillips, Daniel J.; Rappoport, Zvi; Trueblood, Kenneth N.; Acta Crystallographica Section B 66 (2010) 622–638; doi:10.1107/S0108768110040024

data_2104821
_publ_section_title
;
 Thermal motion of <i>tert</i>-butyl groups III. <i>tert</i>-Butyl
 substituents in aromatic hydrocarbons, the view from the bottom of the
 well
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              622
_journal_page_last               638
_journal_paper_doi               10.1107/S0108768110040024
_journal_volume                  66
_journal_year                    2010
_chemical_formula_moiety         'C36 H58'
_chemical_formula_sum            'C36 H58'
_chemical_formula_weight         490.82
_chemical_name_systematic
;
  2,5-bis(3,5-di-tert-butylphenyl)-2,5-dimethylhexane
;
_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                77.364(2)
_cell_angle_beta                 60.735(2)
_cell_angle_gamma                76.060(3)
_cell_formula_units_Z            1
_cell_length_a                   10.0239(7)
_cell_length_b                   10.0397(7)
_cell_length_c                   9.9982(7)
_cell_measurement_reflns_used    65
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      10.2
_cell_measurement_theta_min      4.0
_cell_volume                     845.83(10)
_computing_cell_refinement       'UCLA Crystallographic Package'
_computing_data_collection       'UCLA Crystallographic Package'
_computing_data_reduction        'UCLA Crystallographic Package'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'modified Huber diffractometer'
_diffrn_measurement_method       \q/2\q
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0586
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            4925
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         30.00
_diffrn_reflns_theta_min         2.11
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.053
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    0.964
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             274
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.447
_refine_diff_density_min         -0.279
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     171
_refine_ls_number_reflns         4925
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.1384
_refine_ls_R_factor_gt           0.0848
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1386P)^2^+0.2807P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2397
_refine_ls_wR_factor_ref         0.2981
_reflns_number_gt                2874
_reflns_number_total             4925
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bk5096.cif
_cod_data_source_block           IVb
_cod_original_sg_symbol_H-M      P_-1
_cod_database_code               2104821