Dineopentylprehnitene (1,2,3,4-tetramethyl-5,6-dineopentylbenzene) at 296 and 223K
Gerkin, Roger E.; Acta Crystallographica Section C 55 (1999) 79–82; doi:10.1107/S010827019801141X

data_2008048
_publ_section_title
;
 Dineopentylprehnitene (1,2,3,4-tetramethyl-5,6-dineopentylbenzene) at
 296 and 223K
;
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              79
_journal_page_last               82
_journal_paper_doi               10.1107/S010827019801141X
_journal_volume                  55
_journal_year                    1999
_chemical_formula_moiety         'C20 H34'
_chemical_formula_sum            'C20 H34'
_chemical_formula_weight         274.49
_chemical_name_common            dineopentylprehnitene
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 106.060(10)
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   30.439(2)
_cell_length_b                   6.314(3)
_cell_length_c                   19.663(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    223
_cell_measurement_theta_max      16.4
_cell_measurement_theta_min      10.3
_cell_volume                     3631.6(18)
_computing_cell_refinement       'MSC/AFC Diffractometer Control Software'
_computing_data_collection
;  MSC/AFC Diffractometer Control Software (Molecular Structure
Corporation,1988)
;
_computing_data_reduction
'TEXSAN (Molecular Structure Corporation, 1995)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  TEXSAN
_computing_structure_refinement  TEXSAN
_computing_structure_solution    'SHELXS86 (Sheldrick, 1985)'
_diffrn_ambient_temperature      223
_diffrn_measurement_device_type  AFC5S
_diffrn_measurement_method       '\w scans '
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'X-ray tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.080
_diffrn_reflns_limit_h_max       39
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            4818
_diffrn_reflns_theta_max         27.56
_diffrn_reflns_theta_min         2.0
_diffrn_standards_decay_%        8.4
_diffrn_standards_interval_count 150
_diffrn_standards_number         6
_exptl_absorpt_coefficient_mu    0.055
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.004
_exptl_crystal_density_meas      ?
_exptl_crystal_description       'cut plate'
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.27
_refine_diff_density_max         0.44
_refine_diff_density_min         -0.43
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_obs   1.80
_refine_ls_hydrogen_treatment    'H atoms fixed (see text)'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         4194
_refine_ls_R_factor_gt           0.072
_refine_ls_shift/su_max          '< 0.01'
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details     'w = 1/ \s^2^(F^2^)'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_obs         0.107
_reflns_number_gt                2064
_reflns_number_total             4194
_reflns_threshold_expression     'I > 2.0\s~I~'
_cod_data_source_file            bk1414.cif
_cod_data_source_block           II
_cod_depositor_comments
;
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:

'_atom_site_adp_type' tag value 'Uij' was replaced with 'Uani' value
20 times.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

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

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        3632(2)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_original_formula_sum        'C20 H34 '
_cod_database_code               2008048