Ytterbium can relax slowly too: a field-induced Yb2 single-molecule magnet.
Lin, Po-Heng; Sun, Wen-Bin; Tian, Yong-Mei; Yan, Peng-Fei; Ungur, Liviu; Chibotaru, Liviu F.; Murugesu, Muralee; Dalton transactions (Cambridge, England : 2003) 41 (2012) 12349–12352; doi:10.1039/c2dt31677c

data_7020484
_publ_section_title
;
 Ytterbium can relax slowly too: a field-induced Yb2 single-molecule
 magnet.
;
_journal_issue                   40
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              12349
_journal_page_last               12352
_journal_paper_doi               10.1039/c2dt31677c
_journal_volume                  41
_journal_year                    2012
_chemical_formula_moiety         'C52 H48 Cl4 N4 O9 Yb2'
_chemical_formula_sum            'C52 H48 Cl4 N4 O9 Yb2'
_chemical_formula_weight         1360.82
_space_group_IT_number           14
_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                 91.7710(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.3969(6)
_cell_length_b                   19.2277(7)
_cell_length_c                   17.8053(6)
_cell_measurement_reflns_used    6582
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      25.9546
_cell_measurement_theta_min      2.4078
_cell_volume                     5268.7(3)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker P4'
_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  0.0476
_diffrn_reflns_av_sigmaI/netI    0.0569
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            38632
_diffrn_reflns_theta_full        28.31
_diffrn_reflns_theta_max         28.31
_diffrn_reflns_theta_min         1.56
_exptl_absorpt_coefficient_mu    3.789
_exptl_absorpt_correction_T_max  0.6003
_exptl_absorpt_correction_T_min  0.5178
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick,1996)'
_exptl_crystal_colour            'white yellow'
_exptl_crystal_density_diffrn    1.716
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2672
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.658
_refine_diff_density_min         -0.649
_refine_diff_density_rms         0.114
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     648
_refine_ls_number_reflns         13100
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.003
_refine_ls_R_factor_all          0.0716
_refine_ls_R_factor_gt           0.0337
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0302P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0686
_refine_ls_wR_factor_ref         0.0814
_reflns_number_gt                8339
_reflns_number_total             13100
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt31677c.txt
_cod_data_source_block           Yb2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7020484