Exploration of the pentacyano-cyclo-pentadienide ion, C(5)(CN)(5)(-), as a weakly coordinating anion and potential superacid conjugate base. Silylation and protonation.
Richardson, Christopher; Reed, Christopher A; Chemical communications (Cambridge, England)  (2004) 706–707; doi:10.1039/b316122f

data_7102532
_publ_section_title
;
 Exploration of the pentacyano-cyclo-pentadienide ion, C(5)(CN)(5)(-),
 as a weakly coordinating anion and potential superacid conjugate base.
 Silylation and protonation.
;
_journal_issue                   6
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              706
_journal_page_last               707
_journal_paper_doi               10.1039/b316122f
_journal_year                    2004
_chemical_formula_sum            'C16 H15 N5 Si'
_chemical_formula_weight         305.42
_space_group_IT_number           43
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            16
_cell_length_a                   23.680(4)
_cell_length_b                   14.653(2)
_cell_length_c                   20.072(3)
_cell_measurement_temperature    223(2)
_cell_volume                     6964.6(18)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0265
_diffrn_reflns_av_sigmaI/netI    0.0261
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -29
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            9993
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         1.92
_exptl_absorpt_coefficient_mu    0.138
_exptl_absorpt_correction_T_max  0.9850
_exptl_absorpt_correction_T_min  0.9455
_exptl_absorpt_correction_type   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.165
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'Frag. prism'
_exptl_crystal_F_000             2560
_exptl_crystal_size_max          0.41
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.352
_refine_diff_density_min         -0.183
_refine_diff_density_rms         0.051
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.01(19)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     202
_refine_ls_number_reflns         2822
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0547
_refine_ls_R_factor_gt           0.0452
_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^)+(0.0808P)^2^+4.8998P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1170
_refine_ls_wR_factor_ref         0.1288
_reflns_number_gt                2444
_reflns_number_total             2822
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b316122f.txt
_cod_data_source_block           cr14fdd2
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 
;
_cod_original_sg_symbol_H-M      Fdd2
_cod_database_code               7102532