Fine-tuning the energy barrier for metal-mediated dinitrogen n≡n bond cleavage.
Keane, Andrew J.; Yonke, Brendan L.; Hirotsu, Masakazu; Zavalij, Peter Y.; Sita, Lawrence R.; Journal of the American Chemical Society 136 (2014) 9906–9909; doi:10.1021/ja505309j

data_4122168
_publ_section_title
;
 Fine-tuning the energy barrier for metal-mediated dinitrogen n\\tb n bond
 cleavage.
;
_journal_issue                   28
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9906
_journal_page_last               9909
_journal_paper_doi               10.1021/ja505309j
_journal_volume                  136
_journal_year                    2014
_chemical_formula_moiety         'C46 H68 N6 Ta2'
_chemical_formula_sum            'C46 H68 N6 Ta2'
_chemical_formula_weight         1066.96
_chemical_name_common            cmpd1b
_chemical_name_systematic
;
cmpd1b
;
_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 & ZCIF'
_cell_angle_alpha                90.00
_cell_angle_beta                 101.8262(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.6870(8)
_cell_length_b                   16.2027(11)
_cell_length_c                   25.0686(17)
_cell_measurement_reflns_used    31145
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      32.0
_cell_measurement_theta_min      2.5
_cell_volume                     4646.3(5)
_computing_cell_refinement       Apex2
_computing_data_collection       'Apex2 (Bruker, 2005)'
_computing_data_reduction        Apex2
_computing_molecular_graphics    'XSHEL (Bruker, 2004)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD area detector'
_diffrn_detector_area_resol_mean 11.198
_diffrn_detector_type            'Bruker Smart Apex 2'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_details      610,610,610,790
_diffrn_measurement_device_type  'three-circle diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_measurement_specimen_support 'MiTeGen loop'
_diffrn_orient_matrix_type       standard
_diffrn_orient_matrix_UB_11      -0.0387686
_diffrn_orient_matrix_UB_12      -0.0549994
_diffrn_orient_matrix_UB_13      0.0001171
_diffrn_orient_matrix_UB_21      -0.0272775
_diffrn_orient_matrix_UB_22      0.0032901
_diffrn_orient_matrix_UB_23      -0.0404453
_diffrn_orient_matrix_UB_31      0.0734530
_diffrn_orient_matrix_UB_32      -0.0278086
_diffrn_orient_matrix_UB_33      -0.0050170
_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  0.0236
_diffrn_reflns_av_sigmaI/netI    0.0178
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            68758
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         30.00
_diffrn_reflns_theta_min         2.08
_diffrn_source_current           30.00
_diffrn_source_voltage           50.00
_exptl_absorpt_coefficient_mu    4.743
_exptl_absorpt_correction_T_max  0.735
_exptl_absorpt_correction_T_min  0.149
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            dark-purple
_exptl_crystal_density_diffrn    1.525
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2128
_exptl_crystal_id                'Sita/Yonke BY-6-088A 150K'
_exptl_crystal_size_max          0.475
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.065
_refine_diff_density_max         1.345
_refine_diff_density_min         -0.623
_refine_diff_density_rms         0.081
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.002
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     516
_refine_ls_number_reflns         13539
_refine_ls_number_restraints     45
_refine_ls_restrained_S_all      1.005
_refine_ls_R_factor_all          0.0267
_refine_ls_R_factor_gt           0.0206
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.01P)^2^+6.39P], P=(max(Fo^2^,0)+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0405
_refine_ls_wR_factor_ref         0.0420
_reflns_number_gt                11810
_reflns_number_total             13539
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja505309j_si_002.cif
_cod_data_source_block           cmpd1b
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

 Adding full bibliography for 4122168--4122182.cif.
;
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4122168