4-Dimethylaminopyridinium-1-squarate
Kolev, Tsonko; Yancheva, Denitsa; Schürmann, Markus; Kleb, Dirk-Christian; Preut, Hans; Spiteller, Michael; Acta Crystallographica Section E 58 (2002) o1267–o1268; doi:10.1107/S1600536802018640

data_2201527
_publ_section_title
;
 4-Dimethylaminopyridinium-1-squarate
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1267
_journal_page_last               o1268
_journal_paper_doi               10.1107/S1600536802018640
_journal_volume                  58
_journal_year                    2002
_chemical_formula_iupac          'C11 H10 N2 O3'
_chemical_formula_moiety         'C11 H10 N2 O3'
_chemical_formula_sum            'C11 H10 N2 O3'
_chemical_formula_weight         218.21
_chemical_name_systematic        ?
_space_group_IT_number           11
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yb'
_symmetry_space_group_name_H-M   'P 1 21/m 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                 95.171(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   4.1031(4)
_cell_length_b                   12.1158(12)
_cell_length_c                   10.4553(10)
_cell_measurement_reflns_used    4542
_cell_measurement_temperature    291.0(10)
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      3.89
_cell_volume                     517.64(9)
_computing_cell_refinement
;
DENZO and SCALEPACK (Otwinowski & Minor, 1997)
;
_computing_data_collection       'COLLECT (Nonius, 1998)'
_computing_data_reduction        'DENZO and SCALEPACK'
_computing_molecular_graphics    'SHELXTL-Plus (Sheldrick, 1991)'
_computing_publication_material
;
SHELXL97, PARST95 (Nardelli, 1995) and PLATON (Spek, 2001)
;
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      291.0(10)
_diffrn_detector_area_resol_mean '19 vertical, 18 horizontal'
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method
;
139 frames via \w-rotation (\D\w=1%) and two times 150 s per frame
(3 sets at different \k-angles)
;
_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  0.029
_diffrn_reflns_av_sigmaI/netI    0.1043
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            4542
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         3.89
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.400
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             228
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.118
_refine_diff_density_min         -0.147
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.909
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     83
_refine_ls_number_reflns         1243
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.909
_refine_ls_R_factor_all          0.1266
_refine_ls_R_factor_gt           0.0374
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0211P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0753
_refine_ls_wR_factor_ref         0.0860
_reflns_number_gt                514
_reflns_number_total             1243
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            na6171.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/m'
_cod_database_code               2201527
_cod_database_fobs_code          2201527