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_4331735
_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            'C42 H67 Cr N O2 Si2'
_chemical_formula_weight         726.15
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.0755(6)
_cell_length_b                   15.5264(6)
_cell_length_c                   21.3870(11)
_cell_measurement_reflns_used    7682
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      23.96
_cell_measurement_theta_min      2.25
_cell_volume                     4341.9(3)
_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 0.974
_diffrn_measured_fraction_theta_max 0.974
_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  0.0331
_diffrn_reflns_av_sigmaI/netI    0.0481
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            25415
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         1.62
_exptl_absorpt_coefficient_mu    0.351
_exptl_absorpt_correction_T_max  0.9492
_exptl_absorpt_correction_T_min  0.8870
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            dark
_exptl_crystal_density_diffrn    1.111
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1576
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.414
_refine_diff_density_min         -0.245
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.013(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.960
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     480
_refine_ls_number_reflns         8358
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.960
_refine_ls_R_factor_all          0.0565
_refine_ls_R_factor_gt           0.0413
_refine_ls_shift/su_max          2.533
_refine_ls_shift/su_mean         0.148
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0781P)^2^+0.2118P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1071
_refine_ls_wR_factor_ref         0.1153
_reflns_number_gt                6827
_reflns_number_total             8358
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic051481wsup4.cif
_cod_data_source_block           dk1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               4331735