ð Stacking interactions in some crystalline cisoid E,E-1,4-diaryl-1,3-butadienes
Jin Liu; Elisia M. Murray; Young Junior,Victor G.; Chemical communications (Cambridge, England)  (2003) –; doi:10.1039/b301578e

data_7103799
_publ_section_title
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&#x00F0; Stacking interactions in some crystalline cisoid 
E,E-1,4-diaryl-1,3-butadienes
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_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_paper_doi               10.1039/b301578e
_journal_year                    2003
_chemical_formula_moiety         'C21 H20'
_chemical_formula_sum            'C21 H20'
_chemical_formula_weight         272.37
_chemical_name_common            03002a
_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   geom
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_cell_formula_units_Z            4
_cell_length_a                   6.0081(8)
_cell_length_b                   11.5316(15)
_cell_length_c                   22.082(3)
_cell_measurement_reflns_used    4009
_cell_measurement_temperature    173(2)
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_cell_volume                     1529.5(3)
_computing_cell_refinement       'Bruker SMART'
_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, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
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_diffrn_reflns_limit_h_min       -7
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_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       28
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_diffrn_reflns_number            18573
_diffrn_reflns_theta_full        27.53
_diffrn_reflns_theta_max         27.53
_diffrn_reflns_theta_min         1.84
_exptl_absorpt_coefficient_mu    0.066
_exptl_absorpt_correction_T_max  0.9816
_exptl_absorpt_correction_T_min  0.9707
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2002)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.183
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             584
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.251
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_refine_diff_density_rms         0.034
_refine_ls_extinction_method     none
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_refine_ls_R_factor_all          0.0520
_refine_ls_R_factor_gt           0.0457
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0471P)^2^+0.4421P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1091
_refine_ls_wR_factor_ref         0.1125
_reflns_number_gt                3130
_reflns_number_total             3507
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b301578e.txt
_cod_data_source_block           03002a
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_exptl_absorpt_correction_type' tag value 'multi-scans' was replaced
with 'multi-scan' value.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
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_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7103799