[18]Annulene put into a new perspective.
Lungerich, Dominik; Nizovtsev, Alexey V.; Heinemann, Frank W.; Hampel, Frank; Meyer, Karsten; Majetich, George; Schleyer, Paul V. R.; Jux, Norbert; Chemical communications (Cambridge, England) 52 (2016) 4710–4713; doi:10.1039/c6cc01309k

data_7118828
_publ_section_title
;
 [18]Annulene put into a new perspective.
;
_journal_issue                   25
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              4710
_journal_page_last               4713
_journal_paper_doi               10.1039/c6cc01309k
_journal_volume                  52
_journal_year                    2016
_chemical_formula_moiety         'C18 H18'
_chemical_formula_sum            'C18 H18'
_chemical_formula_weight         234.32
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_date             2015-11-27
_audit_creation_method
;
Olex2 1.2
(compiled 2015.09.30 svn.r3233 for OlexSys, GUI svn.r5103)
;
_audit_update_record
;
2016-02-10 deposited with the CCDC.
2016-02-22 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 108.855(8)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.230(4)
_cell_length_b                   4.7903(17)
_cell_length_c                   14.674(5)
_cell_measurement_reflns_used    1825
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.37
_cell_measurement_theta_min      2.93
_cell_volume                     680.5(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'SHELXTL 6.12 (Bruker AXS, 2002)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL-2014/6 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL 6.12 (Bruker AXS, 2002)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 83.33
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker Kappa APEX II CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'Quazar focussing montel optics'
_diffrn_radiation_source         'ImuS micro-focus tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0626
_diffrn_reflns_av_unetI/netI     0.0412
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            11902
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        26.000
_diffrn_reflns_theta_max         28.775
_diffrn_reflns_theta_min         2.928
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.064
_exptl_absorpt_correction_T_max  0.7458
_exptl_absorpt_correction_T_min  0.4970
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2014/4 (Bruker,2014/4) was used for absorption correction.
wR2(int) was 0.1175 before and 0.0627 after correction.
The Ratio of minimum to maximum transmission is 0.6664.
The \l/2 correction factor is 0.00150.
;
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.144
_exptl_crystal_description       block
_exptl_crystal_F_000             252
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.154
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         1766
_refine_ls_number_restraints     69
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.0610
_refine_ls_R_factor_gt           0.0404
_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^)+(0.0299P)^2^+0.1767P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0881
_refine_ls_wR_factor_ref         0.0982
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1353
_reflns_number_total             1766
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6cc01309k2.cif
_cod_data_source_block           nj1501
_cod_depositor_comments
'Adding full bibliography for 7118828--7118829.cif.'
_cod_database_code               7118828
_shelxl_version_number           2014/6
_shelx_estimated_absorpt_t_max   0.996
_shelx_estimated_absorpt_t_min   0.987
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
2. Uiso/Uaniso restraints and constraints
Uanis(C11) \\sim Ueq, Uanis(C12) \\sim Ueq, Uanis(C13) \\sim Ueq, Uanis(C14)
\\sim Ueq, Uanis(C15) \\sim Ueq, Uanis(C16) \\sim Ueq, Uanis(C17) \\sim Ueq,
Uanis(C18) \\sim Ueq, Uanis(C19) \\sim Ueq: with sigma of 0.005 and sigma for
terminal atoms of 0.01
3. Same fragment restrains
{C1, C2, C3, C4, C5, C6, C7, C8, C9} sigma for 1-2: 0.02, 1-3: 0.04
as
{C11, C12, C13, C14, C15, C16, C17, C18, C19}
4. Others
 Sof(C11)=Sof(H11)=Sof(C12)=Sof(H12)=Sof(C13)=Sof(H13)=Sof(C14)=Sof(H14)=
 Sof(C15)=Sof(H15)=Sof(C16)=Sof(H16)=Sof(C17)=Sof(H17)=Sof(C18)=Sof(H18)=
 Sof(C19)=Sof(H19)=1-FVAR(1)
 Sof(C1)=Sof(C2)=Sof(C3)=Sof(C4)=Sof(C5)=Sof(C6)=Sof(C7)=Sof(C8)=Sof(C9)=
 Sof(H1)=Sof(H2)=Sof(H3)=Sof(H4)=Sof(H5)=Sof(H6)=Sof(H7)=Sof(H8)=Sof(H9)=FVAR(1)
5.a Aromatic/amide H refined with riding coordinates:
 C11(H11), C12(H12), C13(H13), C14(H14), C15(H15), C16(H16), C17(H17),
 C18(H18), C19(H19)
;
_shelx_res_checksum              57579
_shelx_hkl_checksum              68008
_olex2_submission_special_instructions 'No special instructions were received'