A crystallographic titration of the dipeptide <small>L</small>-isoleucyl-<small>L</small>-isoleucine
Görbitz, Carl Henrik; Acta Crystallographica Section B 60 (2004) 569–577; doi:10.1107/S0108768104014569

data_2102616
_publ_section_title
;
 A crystallographic titration of the dipeptide
 <small>L</small>-isoleucyl-<small>L</small>-isoleucine
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              569
_journal_page_last               577
_journal_paper_doi               10.1107/S0108768104014569
_journal_volume                  60
_journal_year                    2004
_chemical_formula_sum            'C13.8 H27.2 N3.4 O4.7'
_chemical_formula_weight         315.99
_chemical_name_systematic
;
 L-Isoleucyl-L-isoleucine L-Isoleucyl-L-isoleucinium nitrate
 acetonitrile solvate
;
_space_group_IT_number           18
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2 2ab'
_symmetry_space_group_name_H-M   'P 21 21 2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   16.2957(19)
_cell_length_b                   23.426(2)
_cell_length_c                   9.5842(9)
_cell_measurement_reflns_used    3710
_cell_measurement_temperature    105(2)
_cell_measurement_theta_max      25.11
_cell_measurement_theta_min      2.12
_cell_volume                     3658.7(6)
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        'SAINT (Bruker, 2001)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2000)'
_computing_publication_material  'SHELXTL (Bruker, 2000)'
_computing_structure_refinement  'SHELXTL (Bruker, 2000)'
_computing_structure_solution    'SHELXTL (Bruker, 2000)'
_diffrn_ambient_temperature      105(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Siemens SMART CCD diffractometer'
_diffrn_measurement_method
'Sets of exposures each taken over 0.3\% \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  0.0434
_diffrn_reflns_av_sigmaI/netI    0.0242
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            27666
_diffrn_reflns_theta_full        25.11
_diffrn_reflns_theta_max         25.11
_diffrn_reflns_theta_min         2.12
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_T_max  0.996
_exptl_absorpt_correction_T_min  0.804
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.147
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       Plate
_exptl_crystal_F_000             1371
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.42
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.214
_refine_diff_density_min         -0.314
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -4.9(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.140
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     449
_refine_ls_number_reflns         3657
_refine_ls_number_restraints     48
_refine_ls_restrained_S_all      1.135
_refine_ls_R_factor_all          0.0545
_refine_ls_R_factor_gt           0.0472
_refine_ls_shift/su_max          0.007
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0659P)^2^+1.4323P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1238
_refine_ls_wR_factor_ref         0.1290
_reflns_number_gt                3276
_reflns_number_total             3657
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            de5006.cif
_cod_data_source_block           IIdc
_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 
;
_cod_original_cell_volume        3658.7(7)
_cod_original_formula_sum        'C13.80 H27.20 N3.40 O4.70'
_cod_database_code               2102616