<small>L</small>-2-Aminobutyric acid: two fully ordered polymorphs with <i>Z</i>' = 4
Görbitz, Carl Henrik; Acta Crystallographica Section B 66 (2010) 253–259; doi:10.1107/S0108768110005732

data_2104691
_publ_section_title
;
 <small>L</small>-2-Aminobutyric acid: two fully ordered polymorphs
 with <i>Z</i>' = 4
;
_journal_coeditor_code           PS5004
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              253
_journal_page_last               259
_journal_paper_doi               10.1107/S0108768110005732
_journal_volume                  66
_journal_year                    2010
_chemical_formula_moiety         'C4 H9 N O2'
_chemical_formula_sum            'C4 H9 N O2'
_chemical_formula_weight         103.12
_chemical_name_common            L-Abu
_chemical_name_systematic
;
 (S)-2-aminobutyric acid
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 100.326(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   9.614(6)
_cell_length_b                   5.227(3)
_cell_length_c                   21.385(13)
_cell_measurement_pressure       101.0(10)
_cell_measurement_reflns_used    2696
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      27.78
_cell_measurement_theta_min      2.51
_cell_volume                     1057.2(11)
_computing_cell_refinement       'SAINT-Plus (Bruker, 2007)'
_computing_data_collection       'APEX2 (Bruker, 2007)'
_computing_data_reduction        'SAINT-Plus (Bruker, 2007)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      110(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 0.976
_diffrn_measured_fraction_theta_max 0.909
_diffrn_measurement_device_type  'Bruker Apex II CCD diffractometer'
_diffrn_measurement_method
'Sets of exposures each taken over 0.5\% \w rotation'
_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  0.0419
_diffrn_reflns_av_sigmaI/netI    0.0534
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            6460
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         28.55
_diffrn_reflns_theta_min         2.15
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_T_max  0.9898
_exptl_absorpt_correction_T_min  0.7486
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2007)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.296
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'elongated plate'
_exptl_crystal_F_000             448
_exptl_crystal_size_max          1.10
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.374
_refine_diff_density_min         -0.263
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.120
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     261
_refine_ls_number_reflns         2700
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.120
_refine_ls_R_factor_all          0.0619
_refine_ls_R_factor_gt           0.0578
_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^)+(0.0850P)^2^+0.4880P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1619
_refine_ls_wR_factor_ref         0.1647
_reflns_number_gt                2468
_reflns_number_total             2700
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ps5004.cif
_cod_data_source_block           I
_cod_original_cell_volume        1057.1(11)
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2104691
_cod_database_fobs_code          2104691