The reaction of tertiary phosphines with (Ph2Se2I2)2–the influence of steric and electronic effects.
Barnes, Nicholas A.; Godfrey, Stephen M.; Halton, Ruth T. A.; Mushtaq, Imrana; Pritchard, Robin G.; Dalton transactions (Cambridge, England : 2003)  (2006) 4795–4804; doi:10.1039/b608453b

data_7007672
_publ_section_title
;
 The reaction of tertiary phosphines with (Ph2Se2I2)2--the influence of
 steric and electronic effects.
;
_journal_issue                   40
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4795
_journal_page_last               4804
_journal_paper_doi               10.1039/b608453b
_journal_year                    2006
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C27 H26 I3 P1 S3 Se1'
_chemical_formula_sum            'C27 H26 I3 P S3 Se'
_chemical_formula_weight         937.29
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_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_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2002-08-29T09:41:45-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 102.7550(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.20130(10)
_cell_length_b                   28.5610(4)
_cell_length_c                   11.8494(2)
_cell_measurement_reflns_used    32434
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      0.998
_cell_measurement_wavelength     0.71073
_cell_volume                     3037.16(8)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      -0.45996E-2
_diffrn_orient_matrix_UB_12      -0.104087E-1
_diffrn_orient_matrix_UB_13      0.797132E-1
_diffrn_orient_matrix_UB_21      -0.111128
_diffrn_orient_matrix_UB_22      0.2464E-2
_diffrn_orient_matrix_UB_23      -0.208425E-1
_diffrn_orient_matrix_UB_31      -0.67771E-2
_diffrn_orient_matrix_UB_32      -0.333389E-1
_diffrn_orient_matrix_UB_33      -0.264276E-1
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0922
_diffrn_reflns_av_unetI/netI     0.0959
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       36
_diffrn_reflns_limit_k_min       -37
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            32790
_diffrn_reflns_reduction_process
;
Scaled and merged with SORTAV
R.H. Blessing, (1987) Cryst. Rev. 1, 3-58
R.H. Blessing, (1989) J. Appl. Cryst. 22, 396-397
;
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         2.77
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    4.561
_exptl_absorpt_correction_T_max  1.027
_exptl_absorpt_correction_T_min  0.921
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
R.H. Blessing, Acta Cryst. (1995), A51, 33-38
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    2.05
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cube
_exptl_crystal_F_000             1776
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.15
_refine_diff_density_max         1.046
_refine_diff_density_min         -1.234
_refine_diff_density_rms         0.225
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.114
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     319
_refine_ls_number_reflns         6889
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.114
_refine_ls_R_factor_all          0.1426
_refine_ls_R_factor_gt           0.0666
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+15.4411P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0775
_refine_ls_wR_factor_ref         0.0933
_reflns_number_gt                4149
_reflns_number_total             6889
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b608453b.txt
_cod_data_source_block           smg40c
_cod_original_cell_volume        3037.16(7)
_cod_database_code               7007672