The Butterfly Dimer [(tBu3SiO)Cr]2(μ-OSitBu3)2and Its Oxidative Cleavage to (tBu3SiO)2Cr(N−NCPh2)2and (tBu3SiO)2CrN(2,6-Ph2-C6H3)
Sydora, Orson L.; Kuiper, David S.; Wolczanski, Peter T.; Lobkovsky, Emil B.; Dinescu, Adriana; Cundari, Thomas R.; Inorganic Chemistry 45 (2006) 2008–2021; doi:10.1021/ic051481w

data_4331732
_publ_section_title
;
 The Butterfly Dimer [(tBu3SiO)Cr]2(\m-OSitBu3)2and Its Oxidative Cleavage
 to (tBu3SiO)2Cr(N&#x2212;NCPh2)2and (tBu3SiO)2CrN(2,6-Ph2-C6H3)
;
_journal_issue                   5
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              2008
_journal_page_last               2021
_journal_paper_doi               10.1021/ic051481w
_journal_volume                  45
_journal_year                    2006
_chemical_formula_sum            'C55 H86 Cr N4 O2 Si2'
_chemical_formula_weight         943.46
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           7
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P -2yc'
_symmetry_space_group_name_H-M   'P 1 c 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                 116.852(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.7050(17)
_cell_length_b                   18.890(3)
_cell_length_c                   13.1447(18)
_cell_measurement_temperature    173(2)
_cell_volume                     2814.5(7)
_computing_cell_refinement       'Bruker SMART'
_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 0.986
_diffrn_measured_fraction_theta_max 0.986
_diffrn_measurement_device_type  'Bruker 1K CCD area detector'
_diffrn_measurement_method       '0.3 deg. 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  0.0468
_diffrn_reflns_av_sigmaI/netI    0.0708
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            16179
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.16
_exptl_absorpt_coefficient_mu    0.286
_exptl_absorpt_correction_T_max  0.9319
_exptl_absorpt_correction_T_min  0.9064
_exptl_absorpt_correction_type   SADABS
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.113
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1024
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.404
_refine_diff_density_min         -0.382
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.009(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.979
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     797
_refine_ls_number_reflns         9125
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.979
_refine_ls_R_factor_all          0.0660
_refine_ls_R_factor_gt           0.0449
_refine_ls_shift/su_max          0.092
_refine_ls_shift/su_mean         0.006
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0508P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0906
_refine_ls_wR_factor_ref         0.0989
_reflns_number_gt                7246
_reflns_number_total             9125
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic051481wsup3.cif
_cod_data_source_block           m
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_cell_volume        2814.6(7)
_cod_original_sg_symbol_H-M      Pc
_cod_database_code               4331732