Stabilization of 3:1 Site-Differentiated Cubane-Type Clusters in the [Fe4S4]1+ Core Oxidation State by Tertiary Phosphine Ligation: Synthesis, Core Structural Diversity, and S= 1/2 Ground States
Liang Deng; Amit Majumdar; Wayne Lo; R. H. Holm; Inorganic Chemistry 49 (2010) 11118–11126; doi:10.1021/ic101702b

data_4317190
_publ_contact_author_address
;Departemnt of Chemistry and Chemical Biology
12 Oxford Street
Cambridge, MA 02138
United States of America
;
_publ_contact_author_email       holm@chemistry.harvard.edu
_publ_contact_author_name        'Prof. Richard H. Holm'
_publ_section_title
;
 Stabilization of 3:1 Site-Differentiated Cubane-Type Clusters in the
 [Fe4S4]1+ Core Oxidation State by Tertiary Phosphine Ligation: Synthesis,
 Core Structural Diversity, and S= 1/2 Ground States
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              11118
_journal_page_last               11126
_journal_paper_doi               10.1021/ic101702b
_journal_volume                  49
_journal_year                    2010
_chemical_formula_moiety         'C72 H114 Fe8 O2 P4 S8 Si2'
_chemical_formula_sum            'C72 H114 Fe8 O2 P4 S8 Si2'
_chemical_formula_weight         1895.05
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 106.781(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.2573(14)
_cell_length_b                   28.095(4)
_cell_length_c                   14.5028(18)
_cell_measurement_reflns_used    4042
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      23.24
_cell_measurement_theta_min      2.49
_cell_volume                     4391.5(10)
_computing_cell_refinement       'Bruker Saint v7.23A (Bruker, 2005)'
_computing_data_collection       'APEX SMART (Bruker, 2009)'
_computing_data_reduction        'Bruker Saint v7.23A (Bruker, 2005)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_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  0.0717
_diffrn_reflns_av_sigmaI/netI    0.1210
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       33
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            24776
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         1.45
_exptl_absorpt_coefficient_mu    1.612
_exptl_absorpt_correction_T_max  0.8554
_exptl_absorpt_correction_T_min  0.7387
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2005)'
_exptl_crystal_colour            Brown
_exptl_crystal_density_diffrn    1.433
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             1972
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.535
_refine_diff_density_min         -0.295
_refine_diff_density_rms         0.072
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.758
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     447
_refine_ls_number_reflns         7738
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      0.758
_refine_ls_R_factor_all          0.0865
_refine_ls_R_factor_gt           0.0381
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0181P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0606
_refine_ls_wR_factor_ref         0.0676
_reflns_number_gt                4201
_reflns_number_total             7738
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic101702b_si_001_11.cif
_cod_data_source_block           LD92
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_cell_volume        4391.5(9)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4317190