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_2101267
_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'
_cell_angle_alpha                90.650(10)
_cell_angle_beta                 90.01(2)
_cell_angle_gamma                103.860(10)
_cell_formula_units_Z            4
_cell_length_a                   10.703(2)
_cell_length_b                   15.902(2)
_cell_length_c                   10.302(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    296
_cell_measurement_theta_max      47.1
_cell_measurement_theta_min      36.7
_cell_volume                     1702.2(5)
_computing_cell_refinement       MSC/AFC
_computing_data_collection
;
Rigaku AFC6A, MSC/AFC Diffractometer Control Software
;
_computing_data_reduction        xtal_DIFDAT_ADDREF_SORTRF
_computing_molecular_graphics    xtal_ORTEP
_computing_publication_material  xtal_BONDLA_CIFIO
_computing_structure_refinement  xtal_CRYLSQ
_computing_structure_solution    'SHELXS86 (Sheldrick)'
_diffrn_ambient_temperature      296
_diffrn_measurement_device       'Rigaku AFC6A'
_diffrn_measurement_method       \q/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         xray_tube
_diffrn_radiation_type           'Copper K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  .018
_diffrn_reflns_av_sigmaI/netI    .038
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            5400
_diffrn_reflns_reduction_process perpendicular_monochr_Lp
_diffrn_reflns_theta_max         59.98
_diffrn_reflns_theta_min         2.86
_diffrn_standards_decay_%        1
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.44
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   'Absorption correction not applied'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.125
_exptl_crystal_description       rectangular
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         .366
_refine_diff_density_min         -.441
_refine_ls_abs_structure_details none
_refine_ls_abs_structure_Flack   0
_refine_ls_extinction_coef       .00000
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.262
_refine_ls_goodness_of_fit_obs   1.642
_refine_ls_hydrogen_treatment    'no restraint'
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     589
_refine_ls_number_reflns         2677
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          .141
_refine_ls_R_factor_obs          .056
_refine_ls_shift/esd_max         .003
_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         .058
_reflns_number_observed          2677
_reflns_number_total             4982
_reflns_observed_criterion       refl_observed_if_Inet_>2.000_sigma(Inet)
_cod_data_source_file            as0668.cif
_cod_data_source_block           2inrt
_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_sg_symbol_Hall     -P_1
_cod_database_code               2101267