Bis(4-dimethylaminopyridinium) 1,2-difluorodiphosphate
Radek Sluka; Marek Nečas; Miloš Černík; Acta Crystallographica Section E 59 (2003) o190–o192; doi:10.1107/S1600536803001004

data_2202143
_publ_section_title
;
 Bis(4-dimethylaminopyridinium) 1,2-difluorodiphosphate
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o190
_journal_page_last               o192
_journal_paper_doi               10.1107/S1600536803001004
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          '2C7 H11 N2 1+, F2 O5 P2 2-'
_chemical_formula_moiety         '2C7 H11 N2 1+, F2 O5 P2 2-'
_chemical_formula_sum            'C14 H22 F2 N4 O5 P2'
_chemical_formula_weight         426.30
_chemical_name_common
'bis(4-dimethylaminopyridinium) 1,2-difluorodiphosphate'
_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                 92.13(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.386(2)
_cell_length_b                   31.076(6)
_cell_length_c                   7.0720(10)
_cell_measurement_reflns_used    100
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      25.41
_cell_measurement_theta_min      5.23
_cell_volume                     1841.7(6)
_computing_cell_refinement       Xcalibur
_computing_data_collection       'Xcalibur (Oxford Diffraction Ltd, 2001)'
_computing_data_reduction        Xcalibur
_computing_molecular_graphics    SHELXTL
_computing_publication_material  'PLATON (Spek, 1990)'
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Bruker, 1997)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean '0.06 mm'
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Kuma KM-4 CCDr'
_diffrn_measurement_method       \w
_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  0.0461
_diffrn_reflns_av_sigmaI/netI    0.0482
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       36
_diffrn_reflns_limit_k_min       -36
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            9769
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.76
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.291
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.537
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.588
_refine_diff_density_min         -0.580
_refine_ls_extinction_coef       0.024(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.282
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     249
_refine_ls_number_reflns         3200
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.282
_refine_ls_R_factor_all          0.0641
_refine_ls_R_factor_gt           0.0455
_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^)+(0.0728P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1221
_refine_ls_wR_factor_ref         0.1421
_reflns_number_gt                2625
_reflns_number_total             3200
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            om6125.cif
_cod_data_source_block           I
_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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2202143
_cod_database_fobs_code          2202143