Pyridine-capped, oligomeric (o-phenyleneethynylene)s.
Shotwell, Sandra; Windscheif, Paul M.; Smith, Mark D.; Bunz, Uwe H. F.; Organic letters 6 (2004) 4151–4154; doi:10.1021/ol048609i

data_1507013
_publ_section_title
;
 Pyridine-capped, oligomeric (o-phenyleneethynylene)s.
;
_journal_issue                   23
_journal_name_full               'Organic letters'
_journal_page_first              4151
_journal_page_last               4154
_journal_paper_doi               10.1021/ol048609i
_journal_volume                  6
_journal_year                    2004
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C22 H16 N2 O2'
_chemical_formula_sum            'C22 H16 N2 O2'
_chemical_formula_weight         340.37
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 98.916(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8878(11)
_cell_length_b                   26.234(4)
_cell_length_c                   8.5049(12)
_cell_measurement_reflns_used    4414
_cell_measurement_temperature    190(2)
_cell_measurement_theta_max      26.366
_cell_measurement_theta_min      2.424
_cell_volume                     1738.6(4)
_computing_cell_refinement       'SAINT+ NT V6.22 (Bruker, 2001)'
_computing_data_collection       'SMART NT V5.625 (Bruker, 1998)'
_computing_data_reduction        'SAINT+ NT V6.22'
_computing_molecular_graphics    'SHELXTL V6.1 (Sheldrick, 2000)'
_computing_publication_material  'SHELXTL V6.1'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      190(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART APEX CCD diffractometer'
_diffrn_measurement_method       '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  0.0796
_diffrn_reflns_av_sigmaI/netI    0.0241
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1787
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         1.55
_diffrn_standards_decay_%        none
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.300
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.66
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.179
_refine_diff_density_min         -0.382
_refine_diff_density_rms         0.058
_refine_ls_abs_structure_details 'opposites merged'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     237
_refine_ls_number_reflns         1787
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.0422
_refine_ls_R_factor_gt           0.0411
_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^)+(0.0769P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0999
_refine_ls_wR_factor_ref         0.1008
_reflns_number_gt                1712
_reflns_number_total             1787
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol048609isi20040722_114301.cif
_cod_data_source_block           1
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1738.7(4)
_cod_original_sg_symbol_H-M      'C c'
_cod_database_code               1507013