Direct solvothermal growth, crystal structures, and optical properties of one-dimensional lanthanide selenidoarsenate(v) polymers [Ln(dien)2(micro3-AsSe4)] (Ln = Nd, Sm): the first example of an AsSe4(3-) anion acting as a ligand to a lanthanide complex.
Jia, Dingxian; Zhu, Aimei; Deng, Jie; Zhang, Yong; Dai, Jie; Dalton transactions (Cambridge, England : 2003)  (2007) 2083–2086; doi:10.1039/b701995e

data_7005409
_publ_section_title
;
 Direct solvothermal growth, crystal structures, and optical properties
 of one-dimensional lanthanide selenidoarsenate(v) polymers
 [Ln(dien)2(micro3-AsSe4)] (Ln = Nd, Sm): the first example of an
 AsSe4(3-) anion acting as a ligand to a lanthanide complex.
;
_journal_issue                   20
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2083
_journal_page_last               2086
_journal_paper_doi               10.1039/b701995e
_journal_year                    2007
_chemical_formula_moiety         'C8 H26 As N6 Se4 Sm'
_chemical_formula_sum            'C8 H26 As N6 Se4 Sm'
_chemical_formula_weight         747.46
_chemical_name_systematic
;
?
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      61
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.8353(8)
_cell_length_b                   16.2766(17)
_cell_length_c                   26.525(3)
_cell_measurement_reflns_used    10625
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      25.3
_cell_measurement_theta_min      3.0
_cell_volume                     3814.5(7)
_computing_cell_refinement       CrystalClear
_computing_data_collection       CrystalClear
_computing_data_reduction        CrystalStructure
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_detector_area_resol_mean 7.31
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku Mercury'
_diffrn_measurement_method       \w
_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  0.0845
_diffrn_reflns_av_sigmaI/netI    0.0411
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            35371
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         3.04
_exptl_absorpt_coefficient_mu    12.434
_exptl_absorpt_correction_T_max  0.4008
_exptl_absorpt_correction_T_min  0.2131
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    2.603
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2776
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.09
_refine_diff_density_max         1.283
_refine_diff_density_min         -1.454
_refine_diff_density_rms         0.233
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.261
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     178
_refine_ls_number_reflns         3493
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.261
_refine_ls_R_factor_all          0.0678
_refine_ls_R_factor_gt           0.0589
_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^)+(0.0172P)^2^+67.7253P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1020
_refine_ls_wR_factor_ref         0.1048
_reflns_number_gt                3166
_reflns_number_total             3493
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b701995e.txt
_cod_data_source_block           2
_cod_database_code               7005409