Self-Assembling of Zwitterionic Squaramides through Electrostatically Compressed Face-to-Face π-Stacking: A New Supramolecular Synthon
Portell, Anna; Font-Bardia, Mercè; Prohens, Rafel; Crystal Growth & Design 13 (2013) 4200–; doi:10.1021/cg401161d

data_4508339
_publ_section_title
;
 Self-Assembling of Zwitterionic Squaramides through Electrostatically
 Compressed Face-to-Face \p-Stacking: A New Supramolecular Synthon
;
_journal_issue                   10
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              4200
_journal_paper_doi               10.1021/cg401161d
_journal_volume                  13
_journal_year                    2013
_chemical_formula_sum            'C12 H14 N2 O7'
_chemical_formula_weight         298.25
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2013
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_cell_angle_beta                 121.09(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.470(3)
_cell_length_b                   16.818(4)
_cell_length_c                   11.912(5)
_cell_measurement_temperature    293(2)
_cell_volume                     1281.5(9)
_computing_cell_refinement       'AUTOMAR (Claudio Klein, 2007)'
_computing_data_collection       'MARXDS (Claudio Klein, 2005)'
_computing_data_reduction        'MARSCALE (Claudio Klein, 2007)'
_computing_molecular_graphics    'ORTEP (Brueggermann and Smith, 1990)'
_computing_publication_material  'PLATON (Spek, 1990)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.933
_diffrn_measured_fraction_theta_max 0.758
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0332
_diffrn_reflns_av_unetI/netI     0.0203
_diffrn_reflns_Laue_measured_fraction_full 0.933
_diffrn_reflns_Laue_measured_fraction_max 0.758
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            12424
_diffrn_reflns_point_group_measured_fraction_full 0.933
_diffrn_reflns_point_group_measured_fraction_max 0.758
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         32.264
_diffrn_reflns_theta_min         2.335
_exptl_absorpt_coefficient_mu    0.129
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.546
_exptl_crystal_description       prism
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.375
_refine_diff_density_min         -0.359
_refine_diff_density_rms         0.110
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.115
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     192
_refine_ls_number_reflns         3448
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.115
_refine_ls_R_factor_all          0.0633
_refine_ls_R_factor_gt           0.0603
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 w=1/[\s^2^(Fo^2^)+(0.0890P)^2^+0.7621P]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1633
_refine_ls_wR_factor_ref         0.1674
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3264
_reflns_number_total             3448
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            cg401161d_si_003.cif
_cod_data_source_block           shelxl
_cod_database_code               4508339
_shelxl_version_number           2013-2
_shelx_res_checksum              22722
_shelx_hkl_checksum              77342