Pyridine-imide oligomers.
Li, Xiao; Zhan, Chuanlang; Wang, Yaobing; Yao, Jiannian; Chemical communications (Cambridge, England)  (2008) 2444–2446; doi:10.1039/b800020d

data_7103137
_publ_section_title
;
 Pyridine-imide oligomers.
;
_journal_issue                   21
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              2444
_journal_page_last               2446
_journal_paper_doi               10.1039/b800020d
_journal_year                    2008
_chemical_formula_sum            'C32 H25 N7 O10'
_chemical_formula_weight         667.59
_chemical_name_systematic
;
?
;
_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                67.75(3)
_cell_angle_beta                 82.17(3)
_cell_angle_gamma                88.75(3)
_cell_formula_units_Z            2
_cell_length_a                   11.556(2)
_cell_length_b                   12.222(2)
_cell_length_c                   12.249(2)
_cell_measurement_reflns_used    9000
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.00
_cell_measurement_theta_min      2.01
_cell_volume                     1585.4(5)
_computing_cell_refinement       'Rapid Auto(Rigaku 2001)'
_computing_data_collection       'Rapid Auto(Rigaku 2001)'
_computing_data_reduction        'Rapid Auto(Rigaku 2001)'
_computing_molecular_graphics    'XP in Siemens SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELX97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Rigaku raxis Rapid IP Area Detector'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0698
_diffrn_reflns_av_sigmaI/netI    0.0893
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            9000
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_T_max  0.9905
_exptl_absorpt_correction_T_min  0.9738
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSCOR by T.Higashi 8 March, 1995'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.398
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             692
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.233
_refine_diff_density_min         -0.237
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.150
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     452
_refine_ls_number_reflns         5510
_refine_ls_number_restraints     20
_refine_ls_restrained_S_all      1.150
_refine_ls_R_factor_all          0.1767
_refine_ls_R_factor_gt           0.0984
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0541P)^2^+1.2191P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1789
_refine_ls_wR_factor_ref         0.2075
_reflns_number_gt                3011
_reflns_number_total             5510
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b800020d.txt
_cod_data_source_block           sx2094
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7103137