Mechanistic Elucidation of the Stepwise Formation of a Tetranuclear Manganese Pinned Butterfly Cluster via N-N Bond Cleavage, Hydrogen Atom Transfer, and Cluster Rearrangement.
Hamilton, Clifton R.; Gau, Michael R.; Baglia, Regina A.; McWilliams, Sean F.; Zdilla, Michael J.; Journal of the American Chemical Society  (2014) 141218154447008–; doi:10.1021/ja508244x

data_4123124
_publ_section_title
;
 Mechanistic Elucidation of the Stepwise Formation of a Tetranuclear
 Manganese Pinned Butterfly Cluster via N-N Bond Cleavage, Hydrogen Atom
 Transfer, and Cluster Rearrangement.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              141218154447008
_journal_paper_doi               10.1021/ja508244x
_journal_year                    2014
_chemical_formula_moiety         '2[NC5H5], [C36H62Mn2N6Si4]'
_chemical_formula_sum            'C46 H72 Mn2 N8 Si4'
_chemical_formula_weight         959.35
_chemical_melting_point          ?
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2013
_cell_angle_alpha                90
_cell_angle_beta                 96.7912(10)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   11.2553(7)
_cell_length_b                   17.7873(10)
_cell_length_c                   13.1292(8)
_cell_measurement_reflns_used    7292
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.924
_cell_measurement_theta_min      2.259
_cell_volume                     2610.0(3)
_computing_cell_refinement       'SAINT (Bruker-AXS)'
_computing_data_collection       'COSMO (Bruker-AXS)'
_computing_data_reduction        'SADABS (Bruker-AXS)'
_computing_molecular_graphics    XP
_computing_publication_material  'APEX2 Report Generator (Bruker-AXS)'
_computing_structure_refinement  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Kappa APEX II DUO'
_diffrn_measurement_method       'Omega Scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0200
_diffrn_reflns_av_unetI/netI     0.0239
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            17796
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.948
_diffrn_reflns_theta_min         1.937
_diffrn_source                   'fine-focused sealed tube'
_exptl_absorpt_coefficient_mu    0.614
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6698
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
18155 Corrected reflections written to file mo_1526_0m.hkl
 Estimated minimum and maximum transmission:  0.6698  0.7456
 The ratio of these values is more reliable than their absolute values!
 Additional spherical absorption correction applied with mu*r =  0.2000
 Lambda/2 correction factor = 0.0015
;
_exptl_crystal_colour            Pink
_exptl_crystal_density_diffrn    1.221
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             1020
_exptl_crystal_size_max          0.400
_exptl_crystal_size_mid          0.233
_exptl_crystal_size_min          0.175
_refine_diff_density_max         0.414
_refine_diff_density_min         -0.282
_refine_diff_density_rms         0.055
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     278
_refine_ls_number_reflns         6256
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0423
_refine_ls_R_factor_gt           0.0321
_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^)+(0.0438P)^2^+1.0505P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0815
_refine_ls_wR_factor_ref         0.0869
_reflns_Friedel_coverage         0.000
_reflns_number_gt                5242
_reflns_number_total             6256
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja508244x_si_002.cif
_cod_data_source_block           1bTolPy
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value 'not determined' was changed to '?' -
the value is undefined or not
given.

'_exptl_absorpt_correction_type' value 'Multi-scan' changed
to 'multi-scan' according to
/home/saulius/struct/COD-crude-data--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 2935 2014-11-11 08:27:57Z andrius 
;
_cod_database_code               4123124
_shelx_estimated_absorpt_t_min   0.791
_shelx_estimated_absorpt_t_max   0.900
_shelxl_version_number           2013-3
_shelx_res_checksum              18839
_shelx_hkl_checksum              43897