Engineering a twist in 9,10-diethynylanthracenes by steric interactions.
Beeby, Andrew; Findlay, Karen S.; Goeta, Andrés E; Porrès, Laurent; Rutter, Simon R.; Thompson, Amber L.; Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 6 (2007) 982–986; doi:10.1039/b707750e

data_1516041
_publ_section_title
;
 Engineering a twist in 9,10-diethynylanthracenes by steric interactions.
;
_journal_issue                   9
_journal_name_full
'Photochemical &amp; photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology'
_journal_page_first              982
_journal_page_last               986
_journal_paper_doi               10.1039/b707750e
_journal_volume                  6
_journal_year                    2007
_chemical_formula_moiety         'C38 H34'
_chemical_formula_sum            'C38 H34'
_chemical_formula_weight         490.65
_chemical_melting_point          ?
_chemical_name_common            'Bis(2-tbutylphynylethynyl) anthracene'
_chemical_name_systematic
;
Bis(2-tbutylphynylethynyl) anthracene
;
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 98.6420(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.5027(6)
_cell_length_b                   8.2756(5)
_cell_length_c                   17.7737(11)
_cell_measurement_reflns_used    3715
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      57.814
_cell_measurement_theta_min      4.599
_cell_volume                     1381.86(15)
_computing_cell_refinement       'SMART-NT V6.1 (Bruker, 2000)'
_computing_data_collection       'SMART-NT V6.1 (Bruker, 2000)'
_computing_data_reduction        'SMART-NT V6.1 (Bruker, 2000)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker SMART CCD 1K area detector'
_diffrn_measurement_method       \w-scans
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0646
_diffrn_reflns_av_sigmaI/netI    0.0658
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            13736
_diffrn_reflns_theta_full        29.13
_diffrn_reflns_theta_max         29.13
_diffrn_reflns_theta_min         2.30
_exptl_absorpt_coefficient_mu    0.066
_exptl_absorpt_correction_T_max  0.9947
_exptl_absorpt_correction_T_min  0.9908
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'XPREP (SHELXTL,1997)'
_exptl_crystal_colour            clear_pale_yellow
_exptl_crystal_density_diffrn    1.179
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             524
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.229
_refine_diff_density_min         -0.225
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     240
_refine_ls_number_reflns         3699
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0959
_refine_ls_R_factor_gt           0.0538
_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^)+(0.0540P)^2^+0.1476P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1121
_refine_ls_wR_factor_ref         0.1262
_reflns_number_gt                2414
_reflns_number_total             3699
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b707750e.txt
_cod_data_source_block           1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value 'not measured' was changed to '?' -
the value is undefined or not given.

'_symmetry_cell_setting' value
'Monoclinic' changed to 'monoclinic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from
2011-04-26.

'_exptl_absorpt_correction_type' value 'Integration'
changed to 'integration' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' 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 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               1516041