Cocrystals and Salts of Gabapentin: pH Dependent Cocrystal Stability and Solubility
Reddy, L. Sreenivas; Bethune, Sarah J.; Kampf, Jeff W.; Rodríguez-Hornedo, Naír; Crystal Growth & Design 9 (2009) 378–; doi:10.1021/cg800587y

data_4508986
_publ_section_title
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 Cocrystals and Salts of Gabapentin: pH Dependent Cocrystal Stability and
 Solubility
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_journal_issue                   1
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              378
_journal_paper_doi               10.1021/cg800587y
_journal_volume                  9
_journal_year                    2009
_chemical_formula_moiety         'C9 H18 N O2, C11 H7 O3'
_chemical_formula_sum            'C20 H25 N O5'
_chemical_formula_weight         359.41
_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                 101.8550(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.3565(6)
_cell_length_b                   18.4929(15)
_cell_length_c                   13.7524(11)
_cell_measurement_reflns_used    3029
_cell_measurement_temperature    85(2)
_cell_measurement_theta_max      26.10
_cell_measurement_theta_min      2.67
_cell_volume                     1831.0(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART-APEX'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      85(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.1175
_diffrn_reflns_av_sigmaI/netI    0.0514
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            40063
_diffrn_reflns_theta_full        26.58
_diffrn_reflns_theta_max         26.58
_diffrn_reflns_theta_min         1.87
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.9907
_exptl_absorpt_correction_T_min  0.9725
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
  Blessing, R. Acta Cryst. (1995) A51 33-38.
  Sheldrick, G.  TWINABS  (Version 2008/1), Bruker AXS scaling and 
  corrections for twinned crystals University of Gottingen, Germany 2008.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.304
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             768
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.528
_refine_diff_density_min         -0.364
_refine_diff_density_rms         0.080
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.147
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     260
_refine_ls_number_reflns         4419
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.147
_refine_ls_R_factor_all          0.1141
_refine_ls_R_factor_gt           0.0834
_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^)+(0.0700P)^2^+4.0104P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1959
_refine_ls_wR_factor_ref         0.2148
_reflns_number_gt                3320
_reflns_number_total             3801
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg800587ysup1.cif
_cod_data_source_block           4
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
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_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4508986