Nonvolatile memory devices based on polyimides bearing noncoplanar twisted biphenyl units containing carbazole and triphenylamine side-chain groups
Li, Yue-Qin; Fang, Run-Chen; Zheng, An-Min; Chu, Yue-Ying; Tao, Xian; Xu, Hui-Hua; Ding, Shi-Jin; Shen, Ying-Zhong; Journal of Materials Chemistry 21 (2011) 15643–; doi:10.1039/c1jm12453f

data_7238378
_publ_section_title
;
 Nonvolatile memory devices based on polyimides bearing noncoplanar
 twisted biphenyl units containing carbazole and triphenylamine side-chain
 groups
;
_journal_issue                   39
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              15643
_journal_paper_doi               10.1039/c1jm12453f
_journal_volume                  21
_journal_year                    2011
_chemical_formula_sum            'C48 H34 N4'
_chemical_formula_weight         666.79
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_cell_setting           triclinic
_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                91.81(3)
_cell_angle_beta                 111.78(3)
_cell_angle_gamma                107.79(3)
_cell_formula_units_Z            2
_cell_length_a                   11.209(2)
_cell_length_b                   12.600(3)
_cell_length_c                   14.572(3)
_cell_measurement_reflns_used    6334
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.1138
_cell_measurement_theta_min      2.3440
_cell_volume                     1795.1(9)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.978
_diffrn_measured_fraction_theta_max 0.978
_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  0.0558
_diffrn_reflns_av_sigmaI/netI    0.0717
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            17561
_diffrn_reflns_theta_full        26.01
_diffrn_reflns_theta_max         26.01
_diffrn_reflns_theta_min         2.20
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8353
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.233
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             700
_exptl_crystal_size_max          0.2000
_exptl_crystal_size_mid          0.2000
_exptl_crystal_size_min          0.2000
_refine_diff_density_max         0.186
_refine_diff_density_min         -0.243
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.155
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     469
_refine_ls_number_reflns         6913
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.155
_refine_ls_R_factor_all          0.1521
_refine_ls_R_factor_gt           0.0825
_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^)+(0.0840P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1730
_refine_ls_wR_factor_ref         0.2118
_reflns_number_gt                4036
_reflns_number_total             6913
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1jm12453f.txt
_cod_data_source_block           shelxl
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'Multi-scan' was
changed to 'multi-scan' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/RSC/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

data item '_symmetry_cell_setting' value 'Triclinic' was changed to
'triclinic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/RSC/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_cell_volume        1795.3(6)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7238378