The preferred conformation of α-fluoroamides
Banks, John W.; Batsanov, Andrei S.; Howard, Judith A. K.; O’Hagan, David; Rzepa, Henry S.; Martin-Santamaria, Sonsoles; Journal of the Chemical Society, Perkin Transactions 2  (1999) 2409–; doi:10.1039/a907452j

data_7213173
_publ_section_title
;
 The preferred conformation of \a-fluoroamides
;
_journal_issue                   11
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              2409
_journal_paper_doi               10.1039/a907452j
_journal_year                    1999
_chemical_formula_sum            'C12 H15 N O3'
_chemical_formula_weight         221.25
_chemical_name_systematic
; 

 N-propionyl-(S)-phenylalanine 

;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.754(2)
_cell_length_b                   8.139(2)
_cell_length_c                   24.873(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      26.3
_cell_measurement_theta_min      24.0
_cell_volume                     1164.8(5)
_computing_cell_refinement       AFC/MSC
_computing_data_collection       AFC/MSC
_computing_data_reduction        teXsan
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measurement_device       'Rigaku AFC6S 4-circle diffractometer'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0315
_diffrn_reflns_av_sigmaI/netI    0.0438
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -4
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            1899
_diffrn_reflns_theta_max         75.00
_diffrn_reflns_theta_min         3.55
_diffrn_standards_decay_%        2.4
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.746
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9404
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.262
_exptl_crystal_description       plate
_exptl_crystal_F_000             472
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.153
_refine_diff_density_min         -0.147
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.16(33)
_refine_ls_extinction_coef       0.0060(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_all   1.065
_refine_ls_goodness_of_fit_obs   1.071
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     172
_refine_ls_number_reflns         1597
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.529
_refine_ls_restrained_S_obs      1.071
_refine_ls_R_factor_all          0.0467
_refine_ls_R_factor_obs          0.0358
_refine_ls_shift/esd_max         -0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0263P)^2^+0.3055P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1189
_refine_ls_wR_factor_obs         0.0786
_reflns_number_observed          1417
_reflns_number_total             1615
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            907452jsup1.cif
_cod_data_source_block           (1b)
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0263P)^2^+0.3055P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0263P)^2^+0.3055P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1164.9(4)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7213173