Packing modes of (<i>R</i>,<i>R</i>)-tartaric acid esters and amides
Rychlewska, Urszula; Warżajtis, Beata; Acta Crystallographica Section B 56 (2000) 833–848; doi:10.1107/S0108768100004274

data_2102133
_publ_section_title
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 Packing modes of (<i>R</i>,<i>R</i>)-tartaric acid esters and amides
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_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              833
_journal_page_last               848
_journal_paper_doi               10.1107/S0108768100004274
_journal_volume                  56
_journal_year                    2000
_chemical_formula_sum            'C5 H10 N2 O4'
_chemical_formula_weight         162.15
_chemical_melting_point          476.0(10)
_chemical_name_systematic
;
(R,R)-(+)-Tartaric acid N-methyldiamide
;
_space_group_IT_number           92
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4abw 2nw'
_symmetry_space_group_name_H-M   'P 41 21 2'
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   10.5940(10)
_cell_length_b                   10.5940(10)
_cell_length_c                   13.771(3)
_cell_measurement_reflns_used    47
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      12.0
_cell_measurement_theta_min      6.1
_cell_volume                     1545.6(4)
_computing_cell_refinement       'Kuma KM-4 software'
_computing_data_collection       'Kuma KM-4 software (Kuma Diffraction, 1991)'
_computing_data_reduction        'Kuma KM-4 software'
_computing_molecular_graphics    'Simens Analytical X-Ray Instruments (1989)'
_computing_publication_material  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'KM-4 four circle diffractometer'
_diffrn_measurement_method       \Q--2\Q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     .71073
_diffrn_reflns_av_R_equivalents  .0134
_diffrn_reflns_av_sigmaI/netI    .0255
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1939
_diffrn_reflns_theta_max         27.06
_diffrn_reflns_theta_min         2.43
_diffrn_standards_decay_%        .89
_diffrn_standards_interval_count 100
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    .121
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.394
_exptl_crystal_description       'tetragonal bipyramid'
_exptl_crystal_F_000             688
_exptl_crystal_size_max          .45
_exptl_crystal_size_mid          .44
_exptl_crystal_size_min          .41
_refine_diff_density_max         .283
_refine_diff_density_min         -.233
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   .7(19)
_refine_ls_extinction_coef       .030(5)
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_all   1.103
_refine_ls_goodness_of_fit_obs   1.118
_refine_ls_hydrogen_treatment    'riding model'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     113
_refine_ls_number_reflns         1698
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.103
_refine_ls_restrained_S_obs      1.118
_refine_ls_R_factor_all          .0596
_refine_ls_R_factor_obs          .0415
_refine_ls_shift/esd_max         .000
_refine_ls_shift/esd_mean        .000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0699P)^2^+0.2727P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         .1223
_refine_ls_wR_factor_obs         .1121
_reflns_number_observed          1408
_reflns_number_total             1698
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            cf0011.cif
_cod_data_source_block           hn12
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '475-477' was changed to '476.0(10)'
- the average value was taken and precision was estimated.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 

The following automatic conversions were performed:

'_chemical_melting_point' value '475-477' was changed to '476.0(10)'
- the average value was taken and precision was estimated.

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

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0699P)^2^+0.2727P] 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^)+(0.0699P)^2^+0.2727P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_database_code               2102133