Unexpected four- and eight-membered organo P-Se heterocycles.
Hua, Guoxiong; Li, Yang; Slawin, Alexandra M Z; Woollins, J Derek; Chemical communications (Cambridge, England)  (2007) 1465–1467; doi:10.1039/b617418c

data_7101824
_publ_section_title
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 Unexpected four- and eight-membered organo P-Se heterocycles.
;
_journal_issue                   14
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              1465
_journal_page_last               1467
_journal_paper_doi               10.1039/b617418c
_journal_year                    2007
_chemical_formula_moiety         'C24 H28 P2 Se4'
_chemical_formula_sum            'C24 H28 P2 Se4'
_chemical_formula_weight         694.24
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 106.424(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.7069(14)
_cell_length_b                   13.5616(17)
_cell_length_c                   16.717(2)
_cell_measurement_reflns_used    8858
_cell_measurement_temperature    93(2)
_cell_measurement_theta_max      27.90
_cell_measurement_theta_min      1.88
_cell_volume                     2545.8(5)
_computing_cell_refinement       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_collection       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_reduction        'CrystalClear (Rigaku Corp., 2004)'
_computing_molecular_graphics    PLATON
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      93(2)
_diffrn_detector_area_resol_mean 0.83
_diffrn_measured_fraction_theta_full 0.947
_diffrn_measured_fraction_theta_max 0.947
_diffrn_measurement_device_type  CCD
_diffrn_measurement_method       dtprofit.ref
_diffrn_radiation_monochromator  confocal
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0728
_diffrn_reflns_av_sigmaI/netI    0.0554
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            13526
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         2.95
_exptl_absorpt_coefficient_mu    5.901
_exptl_absorpt_correction_T_max  0.3849
_exptl_absorpt_correction_T_min  0.2705
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            Orange
_exptl_crystal_density_diffrn    1.811
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             1352
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.20
_refine_diff_density_max         1.019
_refine_diff_density_min         -0.789
_refine_diff_density_rms         0.139
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     277
_refine_ls_number_reflns         4253
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0619
_refine_ls_R_factor_gt           0.0456
_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^)+(0.0532P)^2^+8.1521P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1033
_refine_ls_wR_factor_ref         0.1103
_reflns_number_gt                3472
_reflns_number_total             4253
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b617418c.txt
_cod_data_source_block           p21n
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7101824