High and Low Rotational Barriers in Metal Tricarbonyl Complexes of 2- and 3-Indenyl Anthracenes and Triptycenes: Rational Design of Molecular Brakes
Nikitin, Kirill; Bothe, Cornelia; Müller-Bunz, Helge; Ortin, Yannick; McGlinchey, Michael J.; Organometallics 31 (2012) 6183–; doi:10.1021/om300512z

data_4079121
_publ_section_title
;
 High and Low Rotational Barriers in Metal Tricarbonyl Complexes of 2- and
 3-Indenyl Anthracenes and Triptycenes: Rational Design of Molecular
 Brakes
;
_journal_issue                   17
_journal_name_full               Organometallics
_journal_page_first              6183
_journal_paper_doi               10.1021/om300512z
_journal_volume                  31
_journal_year                    2012
_chemical_formula_moiety         'C18 H12 O3 Cr'
_chemical_formula_sum            'C18 H12 Cr O3'
_chemical_formula_weight         328.28
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 112.510(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.3264(15)
_cell_length_b                   10.9998(15)
_cell_length_c                   12.2185(16)
_cell_measurement_reflns_used    4711
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.17
_cell_measurement_theta_min      2.69
_cell_volume                     1406.3(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0266
_diffrn_reflns_av_sigmaI/netI    0.0256
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            13882
_diffrn_reflns_theta_full        28.27
_diffrn_reflns_theta_max         28.27
_diffrn_reflns_theta_min         2.09
_exptl_absorpt_coefficient_mu    0.823
_exptl_absorpt_correction_T_max  0.8866
_exptl_absorpt_correction_T_min  0.7514
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
 SADABS v.2.10 (Sheldrick, 2000) was used for absorption correction. 
 R(int) for selected reflections was 0.024 before and 0.023 after 
 correction. The Ratio of minimum to maximum transmission is 0.847510. 
 The \l/2 correction factor is 0.0015. 
;
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.550
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.698
_refine_diff_density_min         -0.239
_refine_diff_density_rms         0.082
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     247
_refine_ls_number_reflns         3460
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.0415
_refine_ls_R_factor_gt           0.0358
_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^)+(0.0560P)^2^+0.6965P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0926
_refine_ls_wR_factor_ref         0.0959
_reflns_number_gt                3027
_reflns_number_total             3460
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            om300512z_si_002.cif
_cod_data_source_block           mjm220(15)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_original_formula_sum        'C18 H12 O3 Cr'
_cod_database_code               4079121