A New Type of Divalent Niobium Compound: The First Nb-Nb Triple Bond in a Tetragonal Lantern Environment
F. Albert Cotton; John H. Matonic; Carlos A. Murillo; Journal of the American Chemical Society 119 (1997) 7889–7890; doi:10.1021/ja9715152

data_4117009
_publ_section_title
;
 A New Type of Divalent Niobium Compound: The First Nb-Nb Triple Bond in a
 Tetragonal Lantern Environment
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7889
_journal_page_last               7890
_journal_paper_doi               10.1021/ja9715152
_journal_volume                  119
_journal_year                    1997
_chemical_formula_sum            'C28 H48 N12 Nb2'
_chemical_formula_weight         738.60
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                87.26(3)
_cell_angle_beta                 70.530(5)
_cell_angle_gamma                80.77(1)
_cell_formula_units_Z            1
_cell_length_a                   8.437(1)
_cell_length_b                   9.615(2)
_cell_length_c                   10.268(1)
_cell_measurement_reflns_used    166
_cell_measurement_temperature    213(2)
_cell_measurement_theta_max      41
_cell_measurement_theta_min      30
_cell_volume                     775.1(2)
_computing_cell_refinement       'MADNES (Enraf-Nonius)'
_computing_data_collection       'MADNES (Enraf-Nonius)'
_computing_data_reduction        'SHELXL-93 (Sheldrick, 1993)'
_computing_molecular_graphics    'SHELXL-93 (Sheldrick, 1993)'
_computing_publication_material  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      213(2)
_diffrn_measurement_device       Nonius-Fast
_diffrn_measurement_method       '0.2 deg. omega and phi 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  0.0493
_diffrn_reflns_av_sigmaI/netI    0.0423
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            3948
_diffrn_reflns_theta_max         22.51
_diffrn_reflns_theta_min         2.15
_exptl_absorpt_coefficient_mu    0.780
_exptl_absorpt_correction_T_max  0.990
_exptl_absorpt_correction_T_min  0.650
_exptl_absorpt_correction_type   Sortav
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.582
_exptl_crystal_description       block
_exptl_crystal_F_000             382
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.538
_refine_diff_density_min         -0.606
_refine_diff_density_rms         0.090
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.081
_refine_ls_goodness_of_fit_obs   1.081
_refine_ls_hydrogen_treatment    calculated
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         1944
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.081
_refine_ls_restrained_S_obs      1.081
_refine_ls_R_factor_all          0.0442
_refine_ls_R_factor_obs          0.0392
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0137P)^2^+3.5210P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0927
_refine_ls_wR_factor_obs         0.0887
_reflns_number_observed          1795
_reflns_number_total             1944
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ja9715152.cif
_cod_data_source_block           Cotton
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0137P)^2^+3.5210P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0137P)^2^+3.5210P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_database_code               4117009