A highly reduced cyanogen ligand derived from cyanide reductive coupling
Alexander R. Fox; Christopher C. Cummins; Chem.Commun. 48 (2012) 3061–; doi:10.1039/c2cc17212g

data_7107465
_publ_section_title
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 A highly reduced cyanogen ligand derived from cyanide reductive coupling
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_journal_name_full               Chem.Commun.
_journal_page_first              3061
_journal_paper_doi               10.1039/c2cc17212g
_journal_volume                  48
_journal_year                    2012
_chemical_formula_sum            'C80 H120 N8 Nb2'
_chemical_formula_weight         1379.66
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            4
_cell_length_a                   20.1847(14)
_cell_length_b                   20.4366(13)
_cell_length_c                   20.6242(14)
_cell_measurement_reflns_used    9675
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      29.86
_cell_measurement_theta_min      2.43
_cell_volume                     8507.6(10)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0873
_diffrn_reflns_av_sigmaI/netI    0.0401
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -27
_diffrn_reflns_limit_k_max       27
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            173856
_diffrn_reflns_theta_full        29.13
_diffrn_reflns_theta_max         29.13
_diffrn_reflns_theta_min         1.73
_exptl_absorpt_coefficient_mu    0.311
_exptl_absorpt_correction_T_max  0.9549
_exptl_absorpt_correction_T_min  0.9404
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2009)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.077
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2952
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_platon_squeeze_details
;
;
_refine_diff_density_max         0.628
_refine_diff_density_min         -0.432
_refine_diff_density_rms         0.066
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     421
_refine_ls_number_reflns         11437
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.089
_refine_ls_R_factor_all          0.0672
_refine_ls_R_factor_gt           0.0459
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0424P)^2^+5.4741P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1013
_refine_ls_wR_factor_ref         0.1091
_reflns_number_gt                8920
_reflns_number_total             11437
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc17212g.txt
_cod_data_source_block           squeeze
_cod_depositor_comments
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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 
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_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7107465