Efficient room-temperature synthesis of a highly strained carbon nanohoop fragment of buckminsterfullerene
Paul J. Evans; Evan R. Darzi; Ramesh Jasti; Nature Chemistry 6 (2014) 404–408; doi:10.1038/nchem.1888

data_1551490
_publ_section_title
;
 Efficient room-temperature synthesis of a highly strained carbon nanohoop
 fragment of buckminsterfullerene
;
_journal_name_full               'Nature Chemistry'
_journal_page_first              404
_journal_page_last               408
_journal_paper_doi               10.1038/nchem.1888
_journal_volume                  6
_journal_year                    2014
_chemical_formula_moiety         'C32 H28 O2'
_chemical_formula_sum            'C32 H28 O2'
_chemical_formula_weight         444.54
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_cell_angle_alpha                90
_cell_angle_beta                 92.014(6)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   17.444(3)
_cell_length_b                   10.8686(19)
_cell_length_c                   12.1775(19)
_cell_measurement_reflns_used    9074
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      66.642
_cell_measurement_theta_min      2.532
_cell_volume                     2307.3(7)
_computing_data_collection       'APEX2 (Bruker, 2006)'
_computing_data_reduction        'SAINT (Bruker, 2006)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2008)'
_diffrn_ambient_temperature      100.01
_diffrn_measured_fraction_theta_full 0.932
_diffrn_measured_fraction_theta_max 0.932
_diffrn_measurement_device_type  'Bruker Proteum-R'
_diffrn_measurement_method       '\w & \f scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0690
_diffrn_reflns_av_unetI/netI     0.0424
_diffrn_reflns_Laue_measured_fraction_full 0.932
_diffrn_reflns_Laue_measured_fraction_max 0.932
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            37719
_diffrn_reflns_point_group_measured_fraction_full 0.932
_diffrn_reflns_point_group_measured_fraction_max 0.932
_diffrn_reflns_theta_full        66.868
_diffrn_reflns_theta_max         66.868
_diffrn_reflns_theta_min         2.534
_diffrn_source                   'rotating anode'
_exptl_absorpt_coefficient_mu    0.608
_exptl_absorpt_correction_T_max  0.7370
_exptl_absorpt_correction_T_min  0.6695
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.286
_exptl_crystal_description       fragment
_exptl_crystal_F_000             944.0
_exptl_crystal_size_max          0.106
_exptl_crystal_size_mid          0.096
_exptl_crystal_size_min          0.060
_refine_diff_density_max         0.222
_refine_diff_density_min         -0.202
_refine_diff_density_rms         0.041
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     309
_refine_ls_number_reflns         3835
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0575
_refine_ls_R_factor_gt           0.0523
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0349P)^2^+1.6425P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0968
_refine_ls_wR_factor_ref         0.0984
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                3548
_reflns_number_total             3835
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            nchem.1888-s2.cif
_cod_data_source_block           darzi5
_cod_database_code               1551490
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C8(H8), C24(H24)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C5(H5), C6(H6), C9(H9), C10(H10), C16(H16), C17(H17),
 C19(H19), C20(H20), C22(H22), C23(H23), C25(H25), C26(H26), C27(H27), C28(H28),
  C29(H29), C30(H30), C31(H31), C32(H32)
2.c Idealised Me refined as rotating group:
 C12(H12A,H12B,H12C), C13(H13A,H13B,H13C)
;
_shelx_res_checksum              19755
_shelx_hkl_checksum              97146