Heterovalent Clusters: Ln4Se(SePh)8 (Ln4= Sm4, Yb4, Sm2Yb2, Nd2Yb2)
Deborah Freedman; Safak Sayan; Thomas J. Emge; Mark Croft; John G. Brennan; Journal of the American Chemical Society 121 (1999) 11713–11719; doi:10.1021/ja991437d

data_4116642
_publ_contact_author_address
;
 Department of Chemistry
 Rutgers, The State University of New Jersey
 610 Taylor Road
 Piscataway, New Jersey  08854-8087  U.S.A.
;
_publ_contact_author_fax         (732)-445-5312
_publ_contact_author_name        'J. G. Brennan'
_publ_section_title
;
 Heterovalent Clusters: Ln4Se(SePh)8 (Ln4= Sm4, Yb4, Sm2Yb2, Nd2Yb2)
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11713
_journal_page_last               11719
_journal_paper_doi               10.1021/ja991437d
_journal_volume                  121
_journal_year                    1999
_chemical_formula_sum            'C17 H22.5 O2.5 Se2.25 Yb'
_chemical_formula_weight         617.55
_space_group_IT_number           130
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4a 2ac'
_symmetry_space_group_name_H-M   'P 4/n c c :2'
_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(2)
_cell_angle_beta                 90.00(2)
_cell_angle_gamma                90.00(2)
_cell_formula_units_Z            16
_cell_length_a                   18.289(3)
_cell_length_b                   18.289(3)
_cell_length_c                   24.299(14)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    153(5)
_cell_measurement_theta_max      15.1
_cell_measurement_theta_min      12.9
_cell_volume                     8128(5)
_computing_cell_refinement       CAD4
_computing_data_collection       CAD4
_computing_data_reduction        local
_computing_molecular_graphics    'XPMA/ZORTEP (Zsolnai, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(5)
_diffrn_measured_fraction_theta_full 0.960
_diffrn_measured_fraction_theta_max 0.960
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       omega-scan
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0949
_diffrn_reflns_av_sigmaI/netI    0.1433
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            4808
_diffrn_reflns_theta_full        22.99
_diffrn_reflns_theta_max         22.99
_diffrn_reflns_theta_min         2.30
_diffrn_standards_decay_%        1
_diffrn_standards_interval_time  3600
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    8.640
_exptl_absorpt_correction_T_max  0.3997
_exptl_absorpt_correction_T_min  0.1519
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   SHELX-76
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    2.019
_exptl_crystal_description       rod
_exptl_crystal_F_000             4656
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.13
_refine_diff_density_max         1.376
_refine_diff_density_min         -1.670
_refine_diff_density_rms         0.216
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.991
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     201
_refine_ls_number_reflns         2722
_refine_ls_number_restraints     215
_refine_ls_restrained_S_all      1.004
_refine_ls_R_factor_all          0.1358
_refine_ls_R_factor_gt           0.0569
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0500P)^2^+1.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1195
_refine_ls_wR_factor_ref         0.1341
_reflns_number_gt                1532
_reflns_number_total             2722
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja991437d_3.cif
_cod_data_source_block           ybsed
_cod_original_sg_symbol_H-M      'P 4/n c c'
_cod_original_formula_sum        'C17 H22.50 O2.50 Se2.25 Yb'
_cod_database_code               4116642