C20H26O4S2Se2
Wirth, Thomas; Callear, Samantha K.; Hursthouse, Michael B.; Crystal Structure Report Archive  (2009) 653–; doi:

data_1520390
_publ_section_title
;
 C20H26O4S2Se2
;
_journal_name_full               'Crystal Structure Report Archive'
_journal_page_first              653
_journal_year                    2009
_chemical_formula_sum            'C20 H26 O4 S2 Se2'
_chemical_formula_weight         552.45
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 110.7530(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.0885(2)
_cell_length_b                   12.5754(3)
_cell_length_c                   14.4854(3)
_cell_measurement_reflns_used    23819
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.91
_cell_volume                     2229.50(8)
_computing_cell_refinement
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_data_collection       'COLLECT (Hooft, R.W.W., 1998)'
_computing_data_reduction
'DENZO (Otwinowski & Minor, 1997) & COLLECT (Hooft, R.W.W., 1998)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type
'Bruker-Nonius Roper CCD camera on \k-goniostat'
_diffrn_measurement_method       '\f & \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker-Nonius FR591 rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0752
_diffrn_reflns_av_sigmaI/netI    0.0518
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            35179
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.01
_exptl_absorpt_coefficient_mu    3.527
_exptl_absorpt_correction_T_max  0.7419
_exptl_absorpt_correction_T_min  0.3890
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS 2007/2 (Sheldrick, G.M., 2007)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.646
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1112
_exptl_crystal_size_max          0.33
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.445
_refine_diff_density_min         -0.649
_refine_diff_density_rms         0.109
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     259
_refine_ls_number_reflns         5099
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0565
_refine_ls_R_factor_gt           0.0366
_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^)+(0.0178P)^2^+3.1282P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0695
_refine_ls_wR_factor_ref         0.0758
_reflns_number_gt                3980
_reflns_number_total             5099
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            eCrystal-653.cif
_cod_data_source_block           2009src0172
_cod_depositor_comments
;
Citation :
Wirth, Thomas and Callear, Samantha K. and 
Hursthouse, Michael B. (2009) 
University of Southampton, Crystal Structure Report Archive. 
(doi:10.5258/ecrystals/653)

More at:
http://ecrystals.chem.soton.ac.uk/653/
;
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               1520390