Accurate hydrogen parameters for the amino acid <small>L</small>-leucine
Binns, Jack; Parsons, Simon; McIntyre, Garry J.; Acta Crystallographica Section B 72 (2016) 885–892; doi:10.1107/S2052520616015699

data_2108012
_publ_section_title
;
 Accurate hydrogen parameters for the amino acid <small>L</small>-leucine
;
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              885
_journal_page_last               892
_journal_paper_doi               10.1107/S2052520616015699
_journal_volume                  72
_journal_year                    2016
_chemical_formula_moiety         'C6 H13 N O2'
_chemical_formula_sum            'C6 H13 N O2'
_chemical_formula_weight         131.17
_chemical_name_common            'l-leucine at 120 K'
_chemical_name_systematic        '2-amino-4-methylpentanoic acid'
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 94.20(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.562(2)
_cell_length_b                   5.3010(10)
_cell_length_c                   14.519(3)
_cell_measurement_temperature    120
_cell_volume                     734.0(3)
_computing_cell_refinement       'LaueG (Piltz, 2011)'
_computing_data_collection       'MAATEL/ANSTO control program'
_computing_data_reduction
;
argonne_boxes (Wilkinson et al., 1988) & LaueG (Piltz, 2011)
;
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      120
_diffrn_measured_fraction_theta_full 0.868
_diffrn_measured_fraction_theta_max 0.868
_diffrn_measurement_device       'Laue image-plate diffractometer'
_diffrn_measurement_device_type  KOALA
_diffrn_measurement_method       Laue
_diffrn_radiation_type           neutron
_diffrn_radiation_wavelength     0.80
_diffrn_reflns_av_R_equivalents  0.1555
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            21729
_diffrn_reflns_reduction_process 'LaueG (Piltz, 2011)'
_diffrn_reflns_theta_full        71.26
_diffrn_reflns_theta_max         71.36
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.0
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.187
_exptl_crystal_description       plate
_exptl_crystal_F_000             288
_exptl_crystal_size_max          2
_exptl_crystal_size_mid          0.5
_exptl_crystal_size_min          0.2
_refine_diff_density_max         1.291
_refine_diff_density_min         -1.396
_refine_ls_abs_structure_details
;
Not applicable, absolute structure determined from synthesis
;
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.141
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     397
_refine_ls_number_reflns         2429
_refine_ls_number_restraints     361
_refine_ls_restrained_S_all      1.128
_refine_ls_R_factor_all          0.1183
_refine_ls_R_factor_gt           0.0790
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0484P)^2^+12.6665P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1525
_refine_ls_wR_factor_ref         0.1713
_reflns_number_gt                1955
_reflns_number_total             2430
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            fx5005sup1.cif
_cod_data_source_block           leu_120
_cod_database_code               2108012
_cod_database_fobs_code          2108012
_shelx_hkl_checksum              6222
_shelx_res_checksum              96663