The distinct affinity of cyclopentadienyl ligands towards trivalent uranium over lanthanide ions. Evidence for cooperative ligation and back-bonding in the actinide complexes.
Mehdoui, Thouraya; Berthet, Jean-Claude; Thuery, Pierre; Ephritikhine, Michel; Dalton transactions (Cambridge, England : 2003)  (2005) 1263–1272; doi:10.1039/b419088b

data_7008208
_publ_section_title
;
 The distinct affinity of cyclopentadienyl ligands towards trivalent
 uranium over lanthanide ions. Evidence for cooperative ligation and
 back-bonding in the actinide complexes.
;
_journal_issue                   7
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1263
_journal_page_last               1272
_journal_paper_doi               10.1039/b419088b
_journal_year                    2005
_chemical_formula_sum            'C24 H28 I2 La N3'
_chemical_formula_weight         751.20
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                102.588(3)
_cell_angle_beta                 93.636(3)
_cell_angle_gamma                108.458(3)
_cell_formula_units_Z            2
_cell_length_a                   8.4495(4)
_cell_length_b                   8.8444(5)
_cell_length_c                   19.1107(10)
_cell_measurement_reflns_used    29806
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      25.68
_cell_measurement_theta_min      2.57
_cell_volume                     1308.53(12)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'Kappa-CCD software (Nonius B.V., 1998)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1999)'
_computing_publication_material  'SHELXTL (Sheldrick, 1999)'
_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
'Nonius Kappa-CCD area-detector diffractometer'
_diffrn_measurement_method       'one \f and five \w scans with 2\% steps'
_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  0.0913
_diffrn_reflns_av_sigmaI/netI    0.0428
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            29806
_diffrn_reflns_theta_full        25.68
_diffrn_reflns_theta_max         25.68
_diffrn_reflns_theta_min         2.57
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  0
_exptl_absorpt_coefficient_mu    4.006
_exptl_absorpt_correction_T_max  0.755
_exptl_absorpt_correction_T_min  0.376
_exptl_absorpt_correction_type   refdelf
_exptl_absorpt_process_details   'program DELABS from PLATON (Spek, 2003)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.907
_exptl_crystal_density_meas      ?
_exptl_crystal_description       needle
_exptl_crystal_F_000             712
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.591
_refine_diff_density_min         -0.854
_refine_diff_density_rms         0.113
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.068
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     274
_refine_ls_number_reflns         4967
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.068
_refine_ls_R_factor_all          0.0285
_refine_ls_R_factor_gt           0.0254
_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^)+(0.0143P)^2^+0.8513P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0613
_refine_ls_wR_factor_ref         0.0626
_reflns_number_gt                4647
_reflns_number_total             4967
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b419088b.txt
_cod_data_source_block           5
_cod_database_code               7008208