True square planar [M{N(SePiPr2)2-Se,Se'}2][M = Sn, Se] complexes. An extraordinary geometrical arrangement for well known centers [Sn(II), Se(II)].
Cea-Olivares, Raymundo; Moya-Cabrera, Mónica; García-Montalvo, Verónica; Castro-Blanco, Rafael; Toscano, Rubén A; Hernández-Ortega, Simón; Dalton transactions (Cambridge, England : 2003)  (2005) 1017–1018; doi:10.1039/b418198k

data_7008159
_publ_section_title
;
 True square planar [M{N(SePiPr2)2-Se,Se'}2][M = Sn, Se] complexes. An
 extraordinary geometrical arrangement for well known centers [Sn(II),
 Se(II)].
;
_journal_issue                   6
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              1017
_journal_page_last               1018
_journal_paper_doi               10.1039/b418198k
_journal_year                    2005
_chemical_formula_sum            'C24 H56 N2 P4 Se5'
_chemical_formula_weight         891.39
_chemical_name_common
;
bis(N-(Diisopropylphosphanylselenoyl)-P,P-diisophenylphosphanyl
selenoic amidato-Se,Se')selenium(ii)
;
_chemical_name_systematic
;
2,2,4,4,8,8,10,10-Octaisopropyl-3,9-diaza-2,4,8,10-tetraphospha-
1,5,6,7,11-pentaselenaspiro(5.5)undeca-2,8-diene
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 100.57(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.375(1)
_cell_length_b                   14.725(1)
_cell_length_c                   11.997(1)
_cell_measurement_reflns_used    6145
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      30.92
_cell_measurement_theta_min      2.21
_cell_volume                     1801.7(3)
_computing_cell_refinement       'SMART V 5.625 (Bruker, 1999)'
_computing_data_collection       'SMART V 5.625 (Bruker, 1999)'
_computing_data_reduction        'SAINT V 6.23C (Bruker, 1999)'
_computing_molecular_graphics    'SHELXTL V 6.12 (Sheldrick, 2000)'
_computing_publication_material  'SHELXTL V 6.12 (Sheldrick, 2000)'
_computing_structure_refinement  'SHELXTL V 6.12 (Sheldrick, 2000)'
_computing_structure_solution    'SHELXTL V 6.12 (Sheldrick, 2000)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 0.661
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker Smart Apex CCD diffractometer'
_diffrn_measurement_method       \w-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  0.0569
_diffrn_reflns_av_sigmaI/netI    0.0914
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            24659
_diffrn_reflns_theta_full        32.52
_diffrn_reflns_theta_max         32.52
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    5.277
_exptl_absorpt_correction_T_max  0.5038
_exptl_absorpt_correction_T_min  0.3979
_exptl_absorpt_correction_type   'analytical: face-indexed'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.643
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             888
_exptl_crystal_size_max          0.198
_exptl_crystal_size_mid          0.186
_exptl_crystal_size_min          0.158
_refine_diff_density_max         1.029
_refine_diff_density_min         -0.595
_refine_diff_density_rms         0.076
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.955
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     168
_refine_ls_number_reflns         6513
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.955
_refine_ls_R_factor_all          0.0915
_refine_ls_R_factor_gt           0.0373
_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^)+(0.0017P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0439
_refine_ls_wR_factor_ref         0.0483
_reflns_number_gt                3233
_reflns_number_total             6513
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b418198k.txt
_cod_data_source_block           compound_3
_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_cell_volume        1802(1)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7008159