Homoleptic lanthanide(II)-bis(guanidinate) complexes, [Ln(Giso)(2)] (Giso = [(ArN)(2)CN(C(6)H(11))(2)](-), Ar = C(6)H(3)Pr(i)(2)-2,6): planar 4-coordinate (Ln = Sm or Eu) vs distorted tetrahedral (Ln = Yb) geometries.
Heitmann, Dennis; Jones, Cameron; Junk, Peter C.; Lippert, Kai-Alexander; Stasch, Andreas; Dalton transactions (Cambridge, England : 2003)  (2007) 187–189; doi:10.1039/b614028a

data_7004963
_publ_section_title
;
 Homoleptic lanthanide(II)-bis(guanidinate) complexes, [Ln(Giso)(2)]
 (Giso = [(ArN)(2)CN(C(6)H(11))(2)](-), Ar = C(6)H(3)Pr(i)(2)-2,6):
 planar 4-coordinate (Ln = Sm or Eu) vs distorted tetrahedral (Ln = Yb)
 geometries.
;
_journal_issue                   2
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              187
_journal_page_last               189
_journal_paper_doi               10.1039/b614028a
_journal_year                    2007
_chemical_formula_sum            'C80 H118 N6 Sm'
_chemical_formula_weight         1314.15
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 99.11(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.620(3)
_cell_length_b                   31.033(6)
_cell_length_c                   18.640(4)
_cell_measurement_temperature    150(2)
_cell_volume                     7208(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_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  0.0330
_diffrn_reflns_av_sigmaI/netI    0.0471
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       36
_diffrn_reflns_limit_k_min       -37
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            25396
_diffrn_reflns_theta_full        25.50
_diffrn_reflns_theta_max         25.50
_diffrn_reflns_theta_min         2.96
_exptl_absorpt_coefficient_mu    0.861
_exptl_absorpt_correction_T_max  0.843
_exptl_absorpt_correction_T_min  0.789
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sortav (Blessing, 1995)'
_exptl_crystal_colour            'deep violet'
_exptl_crystal_density_diffrn    1.211
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2808
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         1.426
_refine_diff_density_min         -1.611
_refine_diff_density_rms         0.066
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     800
_refine_ls_number_reflns         13347
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.0554
_refine_ls_R_factor_gt           0.0392
_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^)+(0.0211P)^2^+10.3667P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0810
_refine_ls_wR_factor_ref         0.0874
_reflns_number_gt                10699
_reflns_number_total             13347
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b614028a.txt
_cod_data_source_block           compound1
_cod_original_cell_volume        7208(2)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7004963