Two <i>P</i>2~1~/<i>n</i> Monoclinic Phases of Fluorene-4-carboxylic Acid at 296K
Blackburn, A. C.; Dobson, A. J.; Gerkin, R. E.; Acta Crystallographica Section C 52 (1996) 1482–1486; doi:10.1107/S0108270195016179

data_2004981
_publ_section_title
;
 Two <i>P</i>2~1~/<i>n</i> Monoclinic Phases of Fluorene-4-carboxylic
 Acid at 296K
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1482
_journal_page_last               1486
_journal_paper_doi               10.1107/S0108270195016179
_journal_volume                  52
_journal_year                    1996
_chemical_formula_moiety         'C14 H10 O2 '
_chemical_formula_sum            'C14 H10 O2'
_chemical_formula_weight         210.23
_chemical_name_common            'Alpha-fluorene-4-carboxylic acid'
_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'
_cell_angle_alpha                90
_cell_angle_beta                 99.90(1)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.454(2)
_cell_length_b                   5.507(2)
_cell_length_c                   18.000(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    296
_cell_measurement_theta_max      14.6
_cell_measurement_theta_min      12.9
_cell_volume                     1020.8(4)
_computing_cell_refinement       'MSC/AFC Diffractometer Control Software'
_computing_data_collection
;MSC/AFC Diffractometer Control Software (Molecular Structure Corporation,
 1991)
;
_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       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  0.056
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            2746
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        '+-2.6% (average maximum relative intensity)'
_diffrn_standards_interval_count 150
_diffrn_standards_number         6
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.368
_exptl_crystal_density_meas      ?
_exptl_crystal_description       'cut rod'
_exptl_crystal_F_000             440
_exptl_crystal_size_max          0.92
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.35
_refine_diff_density_min         -0.24
_refine_ls_extinction_coef       '6.8(16) x 10^-7^'
_refine_ls_extinction_method     'Zachariasen (1963, 1968)'
_refine_ls_goodness_of_fit_obs   1.90
_refine_ls_hydrogen_treatment    'H atoms: see text'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     150
_refine_ls_number_reflns         1166
_refine_ls_R_factor_obs          0.048
_refine_ls_shift/esd_max         <0.01
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     w=\s~F~^-2^
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_obs         0.037
_reflns_number_observed          1166
_reflns_number_total             2608
_reflns_observed_criterion       'I >3\s~I~'
_cod_data_source_file            fg1130.cif
_cod_data_source_block           a
_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=\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=\s~F~^-2^'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1020.8(5)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2004981