Redetermination of Octahydrochrysene
Burd, C. J.; Dobson, A. J.; Gerkin, R. E.; Acta Crystallographica Section C 52 (1996) 1241–1243; doi:10.1107/S0108270195015460

data_2004879
_publ_section_title
;
 Redetermination of Octahydrochrysene
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1241
_journal_page_last               1243
_journal_paper_doi               10.1107/S0108270195015460
_journal_volume                  52
_journal_year                    1996
_chemical_formula_moiety         'C18 H20'
_chemical_formula_sum            'C18 H20'
_chemical_formula_weight         236.36
_chemical_name_common            Octahydrochrysene
_chemical_name_systematic        ' 1,2,3,4,7,8,9,10-octahydrochrysene'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 100.793(6)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.1293(7)
_cell_length_b                   7.2499(6)
_cell_length_c                   10.0753(8)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    296
_cell_measurement_theta_max      17.5
_cell_measurement_theta_min      14.3
_cell_volume                     655.05(9)
_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, 1989)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  TEXSAN
_computing_structure_refinement  TEXSAN
_computing_structure_solution    'SHELXS86 (Sheldrick, 1985)'
_diffrn_ambient_temperature      296
_diffrn_measurement_device       'Rigaku AFC5S'
_diffrn_measurement_method       \w
_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  0.038
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            1634
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        '+-2.6 variation'
_diffrn_standards_interval_count 150
_diffrn_standards_number         6
_exptl_absorpt_coefficient_mu    0.062
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'faintly amber'
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_density_meas      ?
_exptl_crystal_description       prism
_exptl_crystal_F_000             256
_exptl_crystal_size_max          0.39
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.23
_refine_diff_density_max         0.18
_refine_diff_density_min         -0.19
_refine_ls_extinction_coef       8E-6(1)
_refine_ls_extinction_method     'Zachariasen (1963, 1968)'
_refine_ls_goodness_of_fit_obs   1.76
_refine_ls_hydrogen_treatment    'All H atoms refined isotropically'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     123
_refine_ls_number_reflns         947
_refine_ls_R_factor_obs          0.045
_refine_ls_shift/esd_max         <0.01
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     'w = 1/\s~F~^2^'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_obs         0.053
_reflns_number_observed          1014
_reflns_number_total             1729
_reflns_observed_criterion       'I >3.0\s~I~'
_cod_data_source_file            fg1138.cif
_cod_data_source_block           octahydrochrysene
_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:

'_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_values 1715 2011-07-08 13:25:40Z 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 'w = 1/\s~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~F~^2^'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2004879