Further crystal structures for the substituted aspirin family of molecules: the first aspirin carboxylate catemer and a detailed assessment of the subtle influences of weak intermolecular interactions
Hursthouse, Michael B.; Montis, Riccardo; Tizzard, Graham J.; CrystEngComm 13 (2011) 3390–; doi:10.1039/c0ce00838a

data_7215304
_publ_section_title
;
 Further crystal structures for the substituted aspirin family of
 molecules: the first aspirin carboxylate catemer and a detailed
 assessment of the subtle influences of weak intermolecular interactions
;
_journal_issue                   10
_journal_name_full               CrystEngComm
_journal_page_first              3390
_journal_paper_doi               10.1039/c0ce00838a
_journal_volume                  13
_journal_year                    2011
_chemical_formula_moiety         'C9 H7 F O4'
_chemical_formula_sum            'C9 H7 F O4'
_chemical_formula_weight         198.15
_chemical_name_common            4-fluoroaspirin
_chemical_name_systematic        '2-acetyloxy-4-fluorobenzoic acid'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 96.917(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.90840(10)
_cell_length_b                   10.0101(5)
_cell_length_c                   17.4781(9)
_cell_measurement_reflns_used    17077
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.91
_cell_volume                     852.51(6)
_computing_cell_refinement
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_data_collection       'COLLECT (Hooft, R.W.W., 1998)'
_computing_data_reduction
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type
'Bruker-Nonius Roper CCD camera on \k-goniostat'
_diffrn_measurement_method       '\f & \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker-Nonius FR591 rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0518
_diffrn_reflns_av_sigmaI/netI    0.0499
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            10471
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         4.07
_exptl_absorpt_coefficient_mu    0.136
_exptl_absorpt_correction_T_max  0.9892
_exptl_absorpt_correction_T_min  0.9839
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2007/2 (Sheldrick, G.M., 2007)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.544
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             408
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.183
_refine_diff_density_min         -0.236
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     132
_refine_ls_number_reflns         1959
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.076
_refine_ls_R_factor_all          0.0692
_refine_ls_R_factor_gt           0.0477
_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^)+(0.0509P)^2^+0.2128P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1084
_refine_ls_wR_factor_ref         0.1215
_reflns_number_gt                1483
_reflns_number_total             1959
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c0ce00838a.txt
_cod_data_source_block           4-fluoroaspirin
_cod_original_sg_symbol_H-M      p2(1)/c
_cod_database_code               7215304