An order‒disorder phase transition in the structure of C~60~·4benzene
Olmstead, Marilyn M.; Balch, Alan L.; Lee, Hon Man; Acta Crystallographica Section B 68 (2012) 66–70; doi:10.1107/S0108768111046593

data_2105065
_publ_section_title
;
 An order--disorder phase transition in the structure of
 C~60~&#x00B7;4benzene
;
_journal_coeditor_code           RY5039
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              66
_journal_page_last               70
_journal_paper_doi               10.1107/S0108768111046593
_journal_volume                  68
_journal_year                    2012
_chemical_formula_moiety         'C60, 4(C6 H6)'
_chemical_formula_sum            'C84 H24'
_chemical_formula_weight         1033.03
_chemical_name_common            C60^.^4benzene
_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                65.258(6)
_cell_angle_beta                 88.309(5)
_cell_angle_gamma                74.854(4)
_cell_formula_units_Z            2
_cell_length_a                   9.9555(10)
_cell_length_b                   15.0855(15)
_cell_length_c                   17.5006(19)
_cell_measurement_temperature    157(2)
_cell_volume                     2294.5(4)
_computing_cell_refinement       'SMART 5.054 (Bruker, 2002)'
_computing_data_collection       'SMART 5.054 (Bruker, 2002)'
_computing_data_reduction        'SAINT 6.35 (Bruker, 2002)'
_computing_molecular_graphics    'SHELXTL 5.1, XP (Sheldrick, 2008)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      157(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART 1000'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.040
_diffrn_reflns_av_sigmaI/netI    0.035
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            25185
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         1.53
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.980
_exptl_absorpt_correction_T_min  0.973
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    1.495
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             1056
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.924
_refine_diff_density_min         -0.486
_refine_ls_extinction_coef       0.002(3)
_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   1.810
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     472
_refine_ls_number_reflns         10483
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.810
_refine_ls_R_factor_all          0.1874
_refine_ls_R_factor_gt           0.1392
_refine_ls_shift/su_max          0.140
_refine_ls_shift/su_mean         0.010
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.2000P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.4371
_refine_ls_wR_factor_ref         0.4832
_reflns_number_gt                6327
_reflns_number_total             10483
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ry5039.cif
_cod_data_source_block           I
_cod_database_code               2105065
_cod_database_fobs_code          2105065