Dinitrogen Functionalization with Terminal Alkynes, Amines, and Hydrazines Promoted by [(η5-C5Me4H)2Zr]2(μ2,η2,η2-N2): Observation of Side-On and End-On Diazenido Complexes in the Reduction of N2 to Hydrazine
Wesley H. Bernskoetter; Jaime A. Pool; Emil Lobkovsky; Paul J. Chirik; Journal of the American Chemical Society 127 (2005) 7901–7911; doi:10.1021/ja050387b

data_4111719
_publ_section_title
;
 Dinitrogen Functionalization with Terminal Alkynes, Amines, and
 Hydrazines Promoted by [(\h5-C5Me4H)2Zr]2(\m2,\h2,\h2-N2): Observation of
 Side-On and End-On Diazenido Complexes in the Reduction of N2 to
 Hydrazine
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7901
_journal_page_last               7911
_journal_paper_doi               10.1021/ja050387b
_journal_volume                  127
_journal_year                    2005
_chemical_formula_sum            'C48 H72 N2 Zr2'
_chemical_formula_weight         859.52
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_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                 101.077(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.0572(14)
_cell_length_b                   18.3235(17)
_cell_length_c                   20.0695(18)
_cell_measurement_reflns_used    6475
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      29.88
_cell_measurement_theta_min      2.81
_cell_volume                     4351.4(8)
_computing_cell_refinement       'Bruker SAINT'
_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      173(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker X8 APEX II diffractometer''
_diffrn_measurement_method       'phi and omega 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  0.0410
_diffrn_reflns_av_sigmaI/netI    0.0529
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            55576
_diffrn_reflns_theta_full        31.12
_diffrn_reflns_theta_max         31.12
_diffrn_reflns_theta_min         1.52
_exptl_absorpt_coefficient_mu    0.513
_exptl_absorpt_correction_T_max  0.9505
_exptl_absorpt_correction_T_min  0.8614
_exptl_absorpt_correction_type   'semiempirical by SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.312
_exptl_crystal_density_meas      0
_exptl_crystal_description       block
_exptl_crystal_F_000             1816
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.686
_refine_diff_density_min         -0.456
_refine_diff_density_rms         0.079
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     515
_refine_ls_number_reflns         13961
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0571
_refine_ls_R_factor_gt           0.0354
_refine_ls_shift/su_max          0.039
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0533P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0908
_refine_ls_wR_factor_ref         0.0977
_reflns_number_gt                10214
_reflns_number_total             13961
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja050387bsi20050325_083603.cif
_cod_data_source_block           wb9
_cod_database_code               4111719