Electron Redistribution of Aromatic Ligands in (Arene)Cr(CO)3Complexes. Structural (Bond-Length) Changes as Quantitative Measures
Le Maguères, P.; Lindeman, S. V.; Kochi, J. K.; Organometallics 20 (2001) 115–; doi:10.1021/om000658l

data_4077185
_publ_section_title
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 Electron Redistribution of Aromatic Ligands in (Arene)Cr(CO)3Complexes.
 Structural (Bond-Length) Changes as Quantitative Measures
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_journal_issue                   1
_journal_name_full               Organometallics
_journal_page_first              115
_journal_paper_doi               10.1021/om000658l
_journal_volume                  20
_journal_year                    2001
_chemical_compound_source        'chemical synthesis'
_chemical_formula_sum            'C20 H24'
_chemical_formula_weight         264.39
_chemical_name_common            OMB
_chemical_name_systematic
; 
 1,2,3,4,5,6,7,8-Octamethylbiphenylene 
;
_space_group_IT_number           12
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_atom_sites_solution_hydrogens   geom
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_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 106.67(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.459(2)
_cell_length_b                   7.003(1)
_cell_length_c                   9.985(2)
_cell_measurement_reflns_used    106
_cell_measurement_temperature    93(2)
_cell_measurement_theta_max      22
_cell_measurement_theta_min      3
_cell_volume                     767.6(3)
_computing_cell_refinement       'SAINT V4.050 (Siemens, 1989-95)'
_computing_data_collection       'SMART V4.050 (Siemens, 1989-95)'
_computing_data_reduction        'SAINT V4.050 (Siemens, 1989-95)'
_computing_molecular_graphics    'XP V5.06 (Siemens, 1996)'
_computing_publication_material  'SHELXL-93 & XCIF V5.05 (Siemens, 1996)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      93(2)
_diffrn_measurement_device       'Siemens SMART'
_diffrn_measurement_method
;
\w-scan, frame range 0.3 deg, hemisphere
;
_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  0.0617
_diffrn_reflns_av_sigmaI/netI    0.1762
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            4090
_diffrn_reflns_theta_max         35.44
_diffrn_reflns_theta_min         2.13
_diffrn_standards_decay_%        0.1
_diffrn_standards_number         136
_exptl_absorpt_coefficient_mu    0.064
_exptl_absorpt_correction_T_max  0.963
_exptl_absorpt_correction_T_min  0.710
_exptl_absorpt_correction_type   'Semi-empirical (SADABS procedure)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.144
_exptl_crystal_density_method    one
_exptl_crystal_description       plate
_exptl_crystal_F_000             288
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.234
_refine_diff_density_min         -0.269
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_refine_ls_extinction_method     none
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_refine_ls_goodness_of_fit_obs   0.859
_refine_ls_hydrogen_treatment
;
riding and rotating model with Uiso=1.5Uiso/eq of an adjacent atom
;
_refine_ls_matrix_type           full
_refine_ls_number_parameters     65
_refine_ls_number_reflns         1737
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.593
_refine_ls_restrained_S_obs      0.859
_refine_ls_R_factor_all          0.1277
_refine_ls_R_factor_obs          0.0628
_refine_ls_shift/esd_max         1.813
_refine_ls_shift/esd_mean        0.041
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1932
_refine_ls_wR_factor_obs         0.1256
_reflns_number_observed          377
_reflns_number_total             1748
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            om000658l.cif
_cod_data_source_block           OMB
_cod_depositor_comments
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The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_original_sg_symbol_H-M      C2/m
_cod_database_code               4077185