Polymorphs of gabapentin
Reece, Hayley A.; Levendis, Demetrius C.; Acta Crystallographica Section C 64 (2008) o105–o108; doi:10.1107/S0108270107066279

data_2016527
_publ_section_title
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 Polymorphs of gabapentin
;
_journal_coeditor_code           TR3031
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o105
_journal_page_last               o108
_journal_paper_doi               10.1107/S0108270107066279
_journal_volume                  64
_journal_year                    2008
_chemical_formula_iupac          'C9 H17 N O2'
_chemical_formula_moiety         'C9 H17 N O2'
_chemical_formula_sum            'C9 H17 N O2'
_chemical_formula_weight         171.24
_chemical_melting_point          437
_chemical_name_common            \g-gabapentin
_chemical_name_systematic
;
1-(ammoniomethyl)cycloheaxaneacetate
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 108.316(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   30.5452(11)
_cell_length_b                   5.9268(2)
_cell_length_c                   10.8841(4)
_cell_measurement_reflns_used    2596
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.87
_cell_measurement_theta_min      2.81
_cell_volume                     1870.58(12)
_computing_cell_refinement       'SAINT-NT (Bruker, 2005)'
_computing_data_collection       'APEX2 (Bruker, 2005)'
_computing_data_reduction        'SAINT-NT (Bruker, 2005)'
_computing_molecular_graphics
'SHELXTL (Bruker, 1999) and DIAMOND (Brandenburg, 2004)'
_computing_publication_material
'SHELXTL (Bruker, 1999), ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2003)'
_computing_structure_refinement  'SHELXTL (Bruker, 1999)'
_computing_structure_solution    'SHELXTL (Bruker, 1999)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEXII CCD detector'
_diffrn_measurement_method       '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  0.0311
_diffrn_reflns_av_sigmaI/netI    0.0269
_diffrn_reflns_limit_h_max       37
_diffrn_reflns_limit_h_min       -38
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            7746
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         1.40
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.216
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             752
_exptl_crystal_size_max          0.58
_exptl_crystal_size_mid          0.49
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.244
_refine_diff_density_min         -0.165
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     110
_refine_ls_number_reflns         2042
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0599
_refine_ls_R_factor_gt           0.0461
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0542P)^2^+1.3490P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1149
_refine_ls_wR_factor_ref         0.1246
_reflns_number_gt                1608
_reflns_number_total             2042
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            tr3031.cif
_cod_data_source_block           II
_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_enum 1527 2010-12-29 10:47:43Z saulius 

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 
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_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               2016527
_cod_database_fobs_code          2016527