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_2104168
_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            'C18 H12 N2 O4'
_chemical_formula_weight         320.30
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                106.26(2)
_cell_angle_beta                 105.30(2)
_cell_angle_gamma                96.55(2)
_cell_formula_units_Z            1
_cell_length_a                   5.7840(14)
_cell_length_b                   7.3241(18)
_cell_length_c                   10.229(3)
_cell_measurement_reflns_used    690
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      26.02
_cell_measurement_theta_min      2.18
_cell_volume                     392.90(19)
_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 0.993
_diffrn_measured_fraction_theta_max 0.993
_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  0.0305
_diffrn_reflns_av_sigmaI/netI    0.0607
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            3310
_diffrn_reflns_theta_full        26.02
_diffrn_reflns_theta_max         26.02
_diffrn_reflns_theta_min         2.18
_diffrn_standards_interval_count 'every 50 dc frames'
_diffrn_standards_number         '2 reference frames'
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.354
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             166
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.138
_refine_diff_density_min         -0.176
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.865
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     109
_refine_ls_number_reflns         1526
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.865
_refine_ls_R_factor_all          0.0931
_refine_ls_R_factor_gt           0.0412
_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^)+(0.0602P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0959
_refine_ls_wR_factor_ref         0.1126
_reflns_number_gt                720
_reflns_number_total             1526
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bs5062.cif
_cod_data_source_block           1c
_cod_original_cell_volume        392.90(18)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               2104168
_cod_database_fobs_code          2104168