Role of the <i>gauche</i> effect and local 1,3-dipole–dipole interactions in stabilizing an unusual conformation of tartarodinitriles
Rychlewska, Urszula; Waścinska, Natalia; Warżajtis, Beata; Gawroński, Jacek; Acta Crystallographica Section B 64 (2008) 497–503; doi:10.1107/S0108768108018272

data_2104169
_publ_contact_author
;
Urszula Rychlewska
Faculty of Chemistry
Adam Mickiewicz University
Grunwaldzka 6
60-780 Pozna\'n
Poland
;
_publ_section_title
;
 Role of the <i>gauche</i> effect and local 1,3-dipole--dipole
 interactions in stabilizing an unusual conformation of
 tartarodinitriles
;
_journal_issue                   4
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              497
_journal_page_last               503
_journal_paper_doi               10.1107/S0108768108018272
_journal_volume                  64
_journal_year                    2008
_chemical_formula_sum            'C8 H8 N2 O4'
_chemical_formula_weight         196.16
_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   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            4
_cell_length_a                   8.6112(3)
_cell_length_b                   9.8185(3)
_cell_length_c                   11.7898(3)
_cell_measurement_reflns_used    1149
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      26.01
_cell_measurement_theta_min      3.15
_cell_volume                     996.82(5)
_computing_cell_refinement       'CrysAlisPRO v.1.171 (Oxford Diffraction,2007)'
_computing_data_collection
'CrysAlis CCD v.1.171 (Oxford Diffraction,2007)'
_computing_data_reduction        'CrysAlisPRO v.1.171 (Oxford Diffraction,2007)'
_computing_molecular_graphics
;
Simens Analytical X-Ray Instruments (1989),
Mercury (Bruno, et al. 2002)
;
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Kuma KM4CCD \k-geometry diffractometer'
_diffrn_measurement_method       '\w scans'
_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  0.0126
_diffrn_reflns_av_sigmaI/netI    0.0094
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            7153
_diffrn_reflns_theta_full        26.01
_diffrn_reflns_theta_max         26.01
_diffrn_reflns_theta_min         3.15
_diffrn_standards_interval_count 'every 50 dc frames'
_diffrn_standards_number         '4 reference frames'
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.307
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cube
_exptl_crystal_F_000             408
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.192
_refine_diff_density_min         -0.153
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.061
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     129
_refine_ls_number_reflns         1149
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0394
_refine_ls_R_factor_gt           0.0346
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0755P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0927
_refine_ls_wR_factor_ref         0.0989
_reflns_number_gt                980
_reflns_number_total             1149
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bs5062.cif
_cod_data_source_block           2b
_cod_database_code               2104169
_cod_database_fobs_code          2104169