Two-Step and Reversible Phase Transitions of Organic Polymer Crystals Produced by Topochemical Polymerization
Matsumoto, Akikazu; Nakazawa, Hideyuki; Macromolecules 37 (2004) 8538–; doi:10.1021/ma048905a

data_1506864
_publ_section_title
;
 Two-Step and Reversible Phase Transitions of Organic Polymer Crystals
 Produced by Topochemical Polymerization
;
_journal_issue                   23
_journal_name_full               Macromolecules
_journal_page_first              8538
_journal_paper_doi               10.1021/ma048905a
_journal_volume                  37
_journal_year                    2004
_chemical_formula_moiety         'C20 H16 Br2 O4 '
_chemical_formula_sum            'C20 H16 Br2 O4'
_chemical_formula_weight         480.15
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 91.05(2)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   5.837(2)
_cell_length_b                   4.856(1)
_cell_length_c                   32.742(9)
_cell_measurement_reflns_used    8712
_cell_measurement_temperature    303.1
_cell_measurement_theta_max      27.4
_cell_measurement_theta_min      3.1
_cell_volume                     927.9(5)
_computing_cell_refinement       PROCESS-AUTO
_computing_data_collection       PROCESS-AUTO
_computing_data_reduction        CrystalStructure
_computing_publication_material  'CrystalStructure 3.6.0'
_computing_structure_refinement  CRYSTALS
_computing_structure_solution    SIR92
_diffrn_detector_area_resol_mean 10.00
_diffrn_measured_fraction_theta_full 0.9791
_diffrn_measured_fraction_theta_max 0.9791
_diffrn_measurement_device_type  'Rigaku RAXIS-RAPID'
_diffrn_measurement_method       \w
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.049
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       42
_diffrn_reflns_limit_l_min       -40
_diffrn_reflns_number            6690
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_exptl_absorpt_coefficient_mu    4.404
_exptl_absorpt_correction_T_max  0.802
_exptl_absorpt_correction_T_min  0.336
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
    Higashi, T. (1995). Program for Absorption Correction.
    Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.719
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             476.00
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.48
_refine_diff_density_min         -0.70
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.203
_refine_ls_hydrogen_treatment    refall
_refine_ls_number_parameters     126
_refine_ls_number_reflns         1456
_refine_ls_R_factor_gt           0.0640
_refine_ls_shift/su_max          0.0000
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
'w = 1/[0.0030Fo^2^ + 3.0000\s(Fo^2^) + 0.5000]'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.0910
_reflns_number_gt                1446
_reflns_number_total             2095
_reflns_threshold_expression     F^2^>2.0\s(F^2^)
_cod_data_source_file            ma048905asi20040818_045716.cif
_cod_data_source_block           '_poly4-BR30_______________'
_cod_original_cell_volume        927.8(5)
_cod_original_formula_sum        'C20 H16 Br2 O4 '
_cod_database_code               1506864