Synthesis of a Uranium(VI)-Carbene: Reductive Formation of Uranyl(V)-Methanides, Oxidative Preparation of a [R2C=U=O]2+ Analogue of the [O=U=O]2+ Uranyl Ion (R = Ph2PNSiMe3), and Comparison of the Nature of UIV=C, UV=C, and UVI=C Double Bonds
David P. Mills; Oliver J. Cooper; Floriana Tuna; Eric J. L. McInnes; E. Stephen Davies; Jonathan McMaster; Fabrizio Moro; William Lewis; Alexander J. Blake; Stephen T. Liddle; Journal of the American Chemical Society 134 (2012) 10047–10054; doi:10.1021/ja301333f

data_4118066
_publ_section_title
;
 Synthesis of a Uranium(VI)-Carbene: Reductive Formation of
 Uranyl(V)-Methanides, Oxidative Preparation of a [R2C=U=O]2+ Analogue of
 the [O=U=O]2+ Uranyl Ion (R = Ph2PNSiMe3), and Comparison of the Nature
 of UIV=C, UV=C, and UVI=C Double Bonds
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10047
_journal_page_last               10054
_journal_paper_doi               10.1021/ja301333f
_journal_volume                  134
_journal_year                    2012
_chemical_formula_moiety         'C31 H38 Cl2.25 N2 O0.75 P2 Si2 U, (C7 H8)'
_chemical_formula_sum            'C38 H46 Cl2.25 N2 O0.75 P2 Si2 U'
_chemical_formula_weight         978.68
_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, Me from difmap'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'enCIFer editing of SHELXL97 CIF output'
_cell_angle_alpha                90.00
_cell_angle_beta                 98.5880(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.1791(9)
_cell_length_b                   11.3857(6)
_cell_length_c                   22.5451(12)
_cell_measurement_reflns_used    18353
_cell_measurement_temperature    90(2)
_cell_measurement_theta_max      27.58
_cell_measurement_theta_min      2.2
_cell_volume                     4106.5(4)
_computing_cell_refinement       'Bruker SAINT version 6.36A (Bruker, 2000)'
_computing_data_collection       'Bruker SMART version 5.625 (Bruker, 2001)'
_computing_data_reduction        'Bruker SAINT; SHELXTL (Sheldrick, 2008)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material
'enCIFer(Allen et al., 2004); PLATON (Spek, 2009)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      90(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker SMART APEX CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0358
_diffrn_reflns_av_sigmaI/netI    0.0284
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            47387
_diffrn_reflns_theta_full        27.59
_diffrn_reflns_theta_max         27.59
_diffrn_reflns_theta_min         2.01
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    4.270
_exptl_absorpt_correction_T_max  0.43
_exptl_absorpt_correction_T_min  0.281
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Bruker, 2001)'
_exptl_crystal_colour            BROWN
_exptl_crystal_density_diffrn    1.585
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             1931
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.07
_refine_diff_density_max         1.930
_refine_diff_density_min         -0.787
_refine_diff_density_rms         0.102
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     489
_refine_ls_number_reflns         9470
_refine_ls_number_restraints     99
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.0381
_refine_ls_R_factor_gt           0.0280
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0309P)^2^+5.2491P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0621
_refine_ls_wR_factor_ref         0.0669
_reflns_number_gt                8042
_reflns_number_total             9470
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ja301333f_si_001_3.cif
_cod_data_source_block           6
_cod_original_sg_symbol_Hall     '-P 2ybc  '
_cod_original_sg_symbol_H-M      'P 1 21/c 1 '
_cod_database_code               4118066