On the Track of New Multicomponent Gabapentin Crystal Forms: Synthon Competition and pH Stability
André, Vânia; Fernandes, Auguste; Santos, Pedro Paulo; Duarte, M. Teresa; Crystal Growth & Design 11 (2011) 2325–; doi:10.1021/cg200008z

data_4500600
_publ_section_title
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 On the Track of New Multicomponent Gabapentin Crystal Forms: Synthon
 Competition and pH Stability
;
_journal_issue                   6
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              2325
_journal_paper_doi               10.1021/cg200008z
_journal_volume                  11
_journal_year                    2011
_chemical_formula_moiety         'C9 H18 N O2, 0.5(C8 H4 O4)'
_chemical_formula_sum            'C13 H20 N O4'
_chemical_formula_weight         254.30
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 101.140(18)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   27.324(17)
_cell_length_b                   6.433(3)
_cell_length_c                   14.561(8)
_cell_measurement_reflns_used    2881
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.35
_cell_measurement_theta_min      3.26
_cell_volume                     2511(2)
_computing_cell_refinement       'BRUKER SMART (Bruker, 2005)'
_computing_data_collection       'BRUKER APEX2 (Bruker, 2005)'
_computing_data_reduction        'BRUKER SAINT (Bruker, 2005)'
_computing_molecular_graphics    'ORTEP 3.2 (Farrugia, 1997) and Mercury 2.2'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR 97 (Altomare et al, 1999)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker APEX-II 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     0.71069
_diffrn_reflns_av_R_equivalents  0.0978
_diffrn_reflns_av_sigmaI/netI    0.0871
_diffrn_reflns_limit_h_max       32
_diffrn_reflns_limit_h_min       -32
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            10134
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         3.26
_exptl_absorpt_coefficient_mu    0.099
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.345
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1096
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.241
_refine_diff_density_min         -0.204
_refine_diff_density_rms         0.052
_refine_ls_extinction_coef       0.0041(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.922
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     177
_refine_ls_number_reflns         2281
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.922
_refine_ls_R_factor_all          0.0922
_refine_ls_R_factor_gt           0.0455
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0461P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0920
_refine_ls_wR_factor_ref         0.1035
_reflns_number_gt                1448
_reflns_number_total             2281
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            cg200008z_si_001.cif
_cod_data_source_block           gbpterephtac
_cod_depositor_comments
;
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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               4500600