Rare earth metal squarates incorporating ethylene glycol ligand with a three-dimensional framework structure: RE(C4O4)1.5(C2H6O2) (RE = Y, La‒Nd, Sm‒Lu)
Liu, Yen-Shen; Tang, Ming-Feng; Lii, Kwang-Hwa; Dalton Transactions  (2009) 9781–9786; doi:10.1039/b911962k

data_7002797
_publ_section_title
;
 Rare earth metal squarates incorporating ethylene glycol ligand with a
 three-dimensional framework structure: RE(C4O4)1.5(C2H6O2) (RE = Y,
 La--Nd, Sm--Lu)
;
_journal_issue                   44
_journal_name_full               'Dalton Transactions'
_journal_page_first              9781
_journal_page_last               9786
_journal_paper_doi               10.1039/b911962k
_journal_year                    2009
_chemical_formula_moiety         Sm(C4O4)1.5(C2H6O2)
_chemical_formula_sum            'C8 H6 O8 Sm'
_chemical_formula_weight         380.48
_chemical_name_systematic
;
?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 98.976(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   12.9151(8)
_cell_length_b                   12.2146(7)
_cell_length_c                   12.6924(7)
_cell_measurement_temperature    296(2)
_cell_volume                     1977.7(2)
_computing_cell_refinement       'Bruker SHELXTL'
_computing_data_collection       'Bruker SHELXTL'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    Diamond
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0247
_diffrn_reflns_av_sigmaI/netI    0.0224
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            9514
_diffrn_reflns_theta_full        28.43
_diffrn_reflns_theta_max         28.43
_diffrn_reflns_theta_min         2.31
_exptl_absorpt_coefficient_mu    5.969
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.5749
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            light-yellow
_exptl_crystal_density_diffrn    2.556
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod-like
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.582
_refine_diff_density_min         -0.684
_refine_diff_density_rms         0.122
_refine_ls_extinction_coef       0.00193(7)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.115
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     179
_refine_ls_number_reflns         2479
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.115
_refine_ls_R_factor_all          0.0182
_refine_ls_R_factor_gt           0.0163
_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^)+(0.0154P)^2^+2.0955P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0377
_refine_ls_wR_factor_ref         0.0384
_reflns_number_gt                2303
_reflns_number_total             2479
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b911962k.txt
_cod_data_source_block           SmSqEg
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7002797