Influence of impurities on the crystallisation of 5-X-aspirin and 5-X-aspirin anhydride polymorphs (X = Cl, Br, Me)
Solanko, Katarzyna A.; Bond., Andrew D.; CrystEngComm 13 (2011) 6991–; doi:10.1039/c1ce06065a

data_7206869
_publ_section_title
;
 Influence of impurities on the crystallisation of 5-X-aspirin and
 5-X-aspirin anhydride polymorphs (X = Cl, Br, Me)
;
_journal_issue                   23
_journal_name_full               CrystEngComm
_journal_page_first              6991
_journal_paper_doi               10.1039/c1ce06065a
_journal_volume                  13
_journal_year                    2011
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C18 H12 Cl2 O7'
_chemical_formula_sum            'C18 H12 Cl2 O7'
_chemical_formula_weight         411.18
_chemical_name_common            '5-Cl-aspirin anhydride (form I)'
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.5412(7)
_cell_length_b                   12.4530(8)
_cell_length_c                   13.5129(10)
_cell_measurement_reflns_used    5560
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.30
_cell_measurement_theta_min      2.53
_cell_volume                     1773.8(2)
_computing_cell_refinement       'SAINT v.7.68a (Bruker, 2010)'
_computing_data_collection       'APEX2 v2010.1-2 (Bruker, 2010)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL v.6.12 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker Nonius X8APEX-II CCD'
_diffrn_measurement_method       '\w and \f 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  0.0395
_diffrn_reflns_av_sigmaI/netI    0.0350
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            18370
_diffrn_reflns_theta_full        25.72
_diffrn_reflns_theta_max         25.72
_diffrn_reflns_theta_min         3.58
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.405
_exptl_absorpt_correction_T_max  0.980
_exptl_absorpt_correction_T_min  0.800
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.540
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.161
_refine_diff_density_min         -0.213
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details 'Flack (1983), 1436 Friedel pairs'
_refine_ls_abs_structure_Flack   -0.01(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.013
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     246
_refine_ls_number_reflns         3363
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.013
_refine_ls_R_factor_all          0.0398
_refine_ls_R_factor_gt           0.0299
_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^)+(0.0258P)^2^+0.5289P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0611
_refine_ls_wR_factor_ref         0.0647
_reflns_number_gt                2943
_reflns_number_total             3363
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c1ce06065a.txt
_cod_data_source_block           5-Cl-A_A_I
_cod_database_code               7206869