Competitive isomerization and dimerization in co-crystals of 1,1,6,6-tetraphenyl-2,4-hexadiyne-1,6-diol and sorbic acid: a new look at stereochemical requirements for [2+2] dimerization.
Zheng, Shao-Liang; Pham, Oanh; Vande Velde, Christophe M L; Gembicky, Milan; Coppens, Philip; Chemical communications (Cambridge, England)  (2008) 2538–2540; doi:10.1039/b802103a

data_7103157
_publ_section_title
;
 Competitive isomerization and dimerization in co-crystals of
 1,1,6,6-tetraphenyl-2,4-hexadiyne-1,6-diol and sorbic acid: a new look
 at stereochemical requirements for [2+2] dimerization.
;
_journal_issue                   22
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              2538
_journal_page_last               2540
_journal_paper_doi               10.1039/b802103a
_journal_year                    2008
_chemical_formula_sum            'C42 H38 O6'
_chemical_formula_weight         638.72
_chemical_melting_point          ?
_chemical_name_common            Diol-2HSA@280k-before-337nm-exposure
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                89.852(1)
_cell_angle_beta                 110.013(2)
_cell_angle_gamma                105.768(1)
_cell_formula_units_Z            1
_cell_length_a                   8.6394(2)
_cell_length_b                   9.7970(2)
_cell_length_c                   11.4362(3)
_cell_measurement_reflns_used    689
_cell_measurement_temperature    280(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      2.5
_cell_volume                     870.90(4)
_computing_cell_refinement       'Bruker APEXII'
_computing_data_collection       'Bruker APEXII'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      280(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0170
_diffrn_reflns_av_sigmaI/netI    0.0148
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            11527
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         1.90
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_T_max  0.9968
_exptl_absorpt_correction_T_min  0.9888
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
'Blessing, R. (1995) Acta Crystallogr., A51, 33-38'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.218
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             338
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.215
_refine_diff_density_min         -0.205
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     225
_refine_ls_number_reflns         3418
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0436
_refine_ls_R_factor_gt           0.0378
_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^)+(0.0436P)^2^+0.2023P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0921
_refine_ls_wR_factor_ref         0.0975
_reflns_number_gt                2995
_reflns_number_total             3418
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b802103a.txt
_cod_data_source_block           Diol-2HSA@280k-before-337nm-exposure
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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:

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

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7103157