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_4122179
_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_absolute_configuration ad
_chemical_formula_moiety         'C36 H64 N6 O Ta2'
_chemical_formula_sum            'C36 H64 N6 O Ta2'
_chemical_formula_weight         958.83
_chemical_name_common            cmpd9a
_chemical_name_systematic
;
cmpd9a
;
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_cell_length_a                   12.3334(16)
_cell_length_b                   18.228(2)
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_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.3
_cell_measurement_theta_min      2.4
_cell_volume                     3726.9(8)
_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, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'CCD area detector'
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_diffrn_detector_type            'Bruker Smart Apex II'
_diffrn_measured_fraction_theta_full 0.972
_diffrn_measured_fraction_theta_max 0.972
_diffrn_measurement_details      165,450,420
_diffrn_measurement_device_type  'three-circle diffractometer'
_diffrn_measurement_method       'omega scans'
_diffrn_measurement_specimen_support 'MiTeGen loop'
_diffrn_orient_matrix_type       standard
_diffrn_orient_matrix_UB_11      0.0524557
_diffrn_orient_matrix_UB_12      -0.0392024
_diffrn_orient_matrix_UB_13      -0.0159421
_diffrn_orient_matrix_UB_21      -0.0203709
_diffrn_orient_matrix_UB_22      -0.0290422
_diffrn_orient_matrix_UB_23      0.0488407
_diffrn_orient_matrix_UB_31      -0.0583725
_diffrn_orient_matrix_UB_32      -0.0250881
_diffrn_orient_matrix_UB_33      -0.0316097
_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  0.0289
_diffrn_reflns_av_sigmaI/netI    0.0580
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       22
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_diffrn_source_current           30.00
_diffrn_source_voltage           50.00
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    5.904
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_exptl_absorpt_correction_T_min  0.580
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            purple
_exptl_crystal_density_diffrn    1.709
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1904
_exptl_crystal_id                'Sita/Yonke BY-5-031 (purple xtals) 100K'
_exptl_crystal_size_max          0.130
_exptl_crystal_size_mid          0.075
_exptl_crystal_size_min          0.050
_refine_diff_density_max         2.373
_refine_diff_density_min         -2.681
_refine_diff_density_rms         0.184
_refine_ls_abs_structure_details '(Flack, 1983)'
_refine_ls_abs_structure_Flack   0.51(1)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.001
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     788
_refine_ls_number_reflns         13935
_refine_ls_number_restraints     174
_refine_ls_restrained_S_all      0.994
_refine_ls_R_factor_all          0.0463
_refine_ls_R_factor_gt           0.0384
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.044P)^2^+4.95P], P=(max(Fo^2^,0)+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0804
_refine_ls_wR_factor_ref         0.0834
_reflns_Friedel_coverage         0.481
_reflns_number_gt                12749
_reflns_number_total             13935
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja505309j_si_002.cif
_cod_data_source_block           cmpd9a
_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
_cod_database_code               4122179
_diffrn_measurement_frame_width-ccd -0.30
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_diffrn_measurement_frame_time-ccd 90
_diffrn_measurement_total_time-ccd 27.6
_diffrn_detector_distance-ccd    5.000
_diffrn_measurement_frame_size-ccd 512