Synthesis and crystal structure and optical properties of fluorenic-core oligomers
Destri, Silvia; Pasini, Mariacecilia; Botta, Chiara; Porzio, William; Bertini, Fabio; Marchiò, Luciano; Journal of Materials Chemistry 12 (2002) 924–; doi:10.1039/b109089p

data_7204277
_publ_section_title
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 Synthesis and crystal structure and optical properties of
 fluorenic-core oligomers
;
_journal_issue                   4
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              924
_journal_paper_doi               10.1039/b109089p
_journal_volume                  12
_journal_year                    2002
_chemical_formula_moiety         2,7-dibromo-9,9-cyclopentanefluorene
_chemical_formula_sum            'C17 H14 Br2'
_chemical_formula_weight         378.10
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   11.746(4)
_cell_length_b                   11.892(3)
_cell_length_c                   20.568(7)
_cell_measurement_reflns_used    24
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      35.9
_cell_measurement_theta_min      18.3
_cell_volume                     2873.0(16)
_computing_cell_refinement       'local programs'
_computing_data_collection       'Enraf-Nonius CAD4 local programs'
_computing_data_reduction        'local programs'
_computing_molecular_graphics    'ORTEP, PLUTON'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    SIR-92
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.885
_diffrn_measured_fraction_theta_max 0.885
_diffrn_measurement_device_type  'Enraf-Nonius CAD4 diffractometer'
_diffrn_measurement_method       theta/2-theta
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0546
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            2718
_diffrn_reflns_theta_full        69.94
_diffrn_reflns_theta_max         69.94
_diffrn_reflns_theta_min         4.30
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 'every 100 reflections'
_diffrn_standards_number         1
_exptl_absorpt_coefficient_mu    7.000
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.860
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.748
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.329
_refine_diff_density_min         -0.369
_refine_diff_density_rms         0.066
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.837
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     186
_refine_ls_number_reflns         2718
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.837
_refine_ls_R_factor_all          0.0704
_refine_ls_R_factor_gt           0.0325
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0276P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0651
_refine_ls_wR_factor_ref         0.0758
_reflns_number_gt                1617
_reflns_number_total             2718
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b109089p.txt
_cod_data_source_block           2,7-dibromo-9,9-cyclopentanefluorene
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0276P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' 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^(Fo^2^)+(0.0276P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7204277