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_4508338
_publ_section_title
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 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_moiety         'C8 H12 N2 O3'
_chemical_formula_sum            'C8 H12 N2 O3'
_chemical_formula_weight         184.20
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 121.72(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.356(6)
_cell_length_b                   9.541(5)
_cell_length_c                   11.672(6)
_cell_measurement_reflns_used    246
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      31
_cell_measurement_theta_min      3
_cell_volume                     886.3(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 0.987
_diffrn_measured_fraction_theta_max 0.763
_diffrn_measurement_device_type  'MAR345 with image plate detector'
_diffrn_measurement_method       'phi scan'
_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  0.0403
_diffrn_reflns_av_sigmaI/netI    0.0287
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6714
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         31.00
_diffrn_reflns_theta_min         2.56
_exptl_absorpt_coefficient_mu    0.107
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.380
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.261
_refine_diff_density_min         -0.258
_refine_diff_density_rms         0.077
_refine_ls_extinction_coef       0.29(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.122
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     121
_refine_ls_number_reflns         2160
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.122
_refine_ls_R_factor_all          0.0682
_refine_ls_R_factor_gt           0.0610
_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^)+(0.0842P)^2^+0.2623P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1587
_refine_ls_wR_factor_ref         0.1665
_reflns_number_gt                1921
_reflns_number_total             2160
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg401161d_si_002.cif
_cod_data_source_block           rm12a1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4508338