β-Oligofurans
Fallon, Thomas; Willis, Anthony C.; Rae, A. David; Paddon-Row, Michael N.; Sherburn, Michael S.; Chemical Science 3 (2012) 2133–; doi:10.1039/c2sc20130e

data_1515150
_publ_section_title
;
 \b-Oligofurans
;
_journal_issue                   6
_journal_name_full               'Chemical Science'
_journal_page_first              2133
_journal_paper_doi               10.1039/c2sc20130e
_journal_volume                  3
_journal_year                    2012
_chemical_compound_source        local
_chemical_formula_moiety         'C16 H8 Br2 O4'
_chemical_formula_sum            'C16 H8 Br2 O4'
_chemical_formula_weight         424.05
_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'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             07-05-31
_audit_creation_method           CRYSTALS_ver_12.18
_audit_update_record
;
2007-05-31 - Report on C16 H8 Br2 O4
by Anthony C. Willis
for Thomas Fallon and Mick Sherburn
2007-05-31 - passes checkcif tests with minor warnings
;
_cell_angle_alpha                90
_cell_angle_beta                 107.1542(15)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.2036(4)
_cell_length_b                   7.7069(2)
_cell_length_c                   14.7968(5)
_cell_measurement_reflns_used    9945
_cell_measurement_temperature    200
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.6
_cell_volume                     1438.72(8)
_computing_cell_refinement       'Denzo/Scalepack (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius BV, 1997)'
_computing_data_reduction        'Denzo/Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics
;
ORTEP-II (Johnson 1976) in teXsan (MSC, 1992-1997)
;
_computing_publication_material  'CRYSTALS (Watkin et al 2003)'
_computing_structure_refinement  'CRYSTALS (Watkin et al 2003)'
_computing_structure_solution    'SIR92 (Altomare et al, 1994)'
_diffrn_ambient_temperature      200
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       ' \f and \w scans with CCD '
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.060
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            13994
_diffrn_reflns_theta_full        27.5
_diffrn_reflns_theta_max         27.517
_diffrn_reflns_theta_min         3.612
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    5.649
_exptl_absorpt_correction_T_max  0.779
_exptl_absorpt_correction_T_min  0.256
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
;
via Gaussian method (Coppens, 1970) implemented in maXus (2000)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.958
_exptl_crystal_density_meas      ?
_exptl_crystal_description       plate
_exptl_crystal_F_000             824
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.33
_refine_diff_density_min         -0.92
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.1093
_refine_ls_hydrogen_treatment    refxyz
_refine_ls_matrix_type           full
_refine_ls_number_parameters     112
_refine_ls_number_reflns         1200
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0367
_refine_ls_R_factor_gt           0.0272
_refine_ls_shift/su_max          0.000755
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
Method, part 1, Chebychev polynomial,
(Carruthers & Watkin, 1979, Prince, 1982)
[weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
Method = Robust Weighting (Prince, 1982)
W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
A~i~ are:
0.985 0.324 0.543
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0393
_refine_ls_wR_factor_gt          0.0310
_refine_ls_wR_factor_ref         0.0310
_reflns_limit_h_max              16
_reflns_limit_h_min              -17
_reflns_limit_k_max              10
_reflns_limit_k_min              0
_reflns_limit_l_max              19
_reflns_limit_l_min              0
_reflns_number_gt                1200
_reflns_number_total             1642
_reflns_threshold_expression     I>3.0\s(I)
_oxford_diffrn_Wilson_B_factor   3.32
_oxford_diffrn_Wilson_scale      5.06
_oxford_refine_ls_scale          0.5906(12)
_oxford_structure_analysis_title '5311504 she0710'
_cod_data_source_file            c2sc20130e.txt
_cod_data_source_block           she0710
_cod_depositor_comments
;
The following automatic conversions were performed:

'_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.

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      'C 1 2/c 1 '
_cod_database_code               1515150