Unusually short ethylene bond and large amplitude torsional motion of (<i>E</i>)-stilbenes in crystals. X-ray crystallographic study of `stiff' stilbenes
Ogawa, K.; Harada, J.; Tomoda, S.; Acta Crystallographica Section B 51 (1995) 240–248; doi:10.1107/S010876819400950X

data_2101268
_publ_section_title
;
 Unusually short ethylene bond and large amplitude torsional motion of
 (<i>E</i>)-stilbenes in crystals. X-ray crystallographic study of
 `stiff' stilbenes
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              240
_journal_page_last               248
_journal_paper_doi               10.1107/S010876819400950X
_journal_volume                  51
_journal_year                    1995
_chemical_formula_moiety         'C22 H24'
_chemical_formula_sum            'C22 H24'
_chemical_formula_weight         288.43
_chemical_melting_point          399.7
_chemical_name_systematic
'      (E)-2,2,2',2'-tetramethyl-1,1'-biindanylidene'
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
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_cell_angle_beta                 90.140(10)
_cell_angle_gamma                103.640(10)
_cell_formula_units_Z            4
_cell_length_a                   10.5550(10)
_cell_length_b                   15.815(2)
_cell_length_c                   10.2060(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    120
_cell_measurement_theta_max      79.0
_cell_measurement_theta_min      50.4
_cell_volume                     1655.5(3)
_computing_cell_refinement       MSC/AFC
_computing_data_collection
;
Rigaku AFC6A, MSC/AFC Diffractometer Control Software
;
_computing_data_reduction        xtal_DIFDAT_ADDREF_SORTRF
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_computing_structure_solution    'SHELXS86 (Sheldrick)'
_diffrn_ambient_temperature      120
_diffrn_measurement_device       'Rigaku AFC6A'
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_exptl_absorpt_process_details   'Absorption correction not applied'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.157
_exptl_crystal_description       rectangular
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_refine_ls_R_factor_obs          .053
_refine_ls_shift/esd_max         .015
_refine_ls_shift/esd_mean        .001
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     'w = 1/(\s^2^(F)+0.0002F^2^)'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         .064
_refine_ls_wR_factor_obs         .059
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_cod_data_source_file            as0668.cif
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_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value '1/(\s^2^(F)+0.0002F^2^)' 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^(F)+0.0002F^2^)'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1655.5(4)
_cod_original_sg_symbol_Hall     -P_1
_cod_database_code               2101268