Symmetry, pseudosymmetry and packing disorder in the alcohol solvates of <small>L</small>-leucyl-<small>L</small>-valine
Görbitz, Carl Henrik; Torgersen, Eirin; Acta Crystallographica, Section B: Structural Science 55 (1999) 104–113; doi:10.1107/S0108768198010192

data_2002993
_publ_section_title
;
 Symmetry, pseudosymmetry and packing disorder in the alcohol solvates
 of <small>L</small>-leucyl-<small>L</small>-valine
;
_journal_coden_ASTM              ASBSDK
_journal_issue                   1
_journal_name_full
;
 Acta Crystallographica, Section B: Structural Science
;
_journal_page_first              104
_journal_page_last               113
_journal_paper_doi               10.1107/S0108768198010192
_journal_volume                  55
_journal_year                    1999
_chemical_formula_sum            'C14 H30 N2 O4'
_chemical_formula_weight         290.40
_chemical_name_systematic
;
 L-leucyl-L-valine 2-propanol (1:1)
;
_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'
_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                   5.17090(10)
_cell_length_b                   14.6136(2)
_cell_length_c                   22.4230(4)
_cell_measurement_reflns_used    7127
_cell_measurement_temperature    150(2)
_cell_volume                     1694.40(5)
_computing_cell_refinement       'SAINT (Siemens, 1995)'
_computing_data_collection       'SMART (Siemens, 1995)'
_computing_data_reduction        'SAINT (Siemens, 1995)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELXTL (Sheldrick, 1994)'
_computing_structure_refinement  'SHELXTL (Sheldrick, 1994)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measurement_device       'Siemens SMART CCD diffractometer'
_diffrn_measurement_method
'Sets of exposures each taken over 0.6\% \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  0.0341
_diffrn_reflns_av_sigmaI/netI    0.0389
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       36
_diffrn_reflns_limit_l_min       -43
_diffrn_reflns_number            32534
_diffrn_reflns_theta_max         43.15
_diffrn_reflns_theta_min         2.29
_diffrn_standards_decay_%        0
_diffrn_standards_number         'not applicable to area detectors'
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.980
_exptl_absorpt_correction_T_min  0.952
_exptl_absorpt_correction_type   'multiscan (SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.138
_exptl_crystal_density_meas      ?
_exptl_crystal_description       Block
_exptl_crystal_F_000             640
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.337
_refine_diff_density_min         -0.225
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.106
_refine_ls_goodness_of_fit_obs   1.140
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     230
_refine_ls_number_reflns         12521
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.107
_refine_ls_restrained_S_obs      1.141
_refine_ls_R_factor_all          0.0796
_refine_ls_R_factor_obs          0.0559
_refine_ls_shift/esd_max         0.007
_refine_ls_shift/esd_mean        0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0524P)^2^+0.1584P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1358
_refine_ls_wR_factor_obs         0.1225
_reflns_number_observed          9601
_reflns_number_total             12521
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ha0173.cif
_cod_data_source_block           lv2p
_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 2.4.1 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 'Orthorhombic' changed to
'orthorhombic' 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 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0524P)^2^+0.1584P] 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^)+(0.0524P)^2^+0.1584P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 212121'
_cod_database_code               2002993
_cod_database_fobs_code          2002993