A novel route to chalcogenides of heavy pnicogens: synthesis and X-ray structure of {(THF)3Li2[PhAs(Se)(NBut)2]}
Briand, Glen G.; Chivers, Tristram; Parvez, Masood; Journal of the Chemical Society, Dalton Transactions  (2002) 3785–; doi:10.1039/b207302a

data_7012064
_publ_section_title
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 A novel route to chalcogenides of heavy pnicogens: synthesis and X-ray
 structure of {(THF)3Li2[PhAs(Se)(NBut)2]}
;
_journal_issue                   20
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              3785
_journal_paper_doi               10.1039/b207302a
_journal_year                    2002
_chemical_compound_source        'synthesized by authors '
_chemical_formula_sum            'C26 H47 As Li2 N2 O3'
_chemical_formula_weight         524.46
_chemical_melting_point          ' ? '
_chemical_name_common            ' ? '
_chemical_name_systematic        ' ? '
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.7419(6)
_cell_length_b                   10.7469(3)
_cell_length_c                   14.6045(5)
_cell_measurement_reflns_used    3356
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      1.0
_cell_volume                     2941.60(16)
_computing_cell_refinement       'HKL DENZO (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Hooft, 1998)'
_computing_data_reduction        'SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'TEXSAN (M. S. C., 1994)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SAPI91 (Fan, 1991)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'Nonius KappaCCD Diffractometer'
_diffrn_measurement_method       ' \w & \f '
_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  0.0353
_diffrn_reflns_av_sigmaI/netI    0.0485
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            6230
_diffrn_reflns_theta_full        27.52
_diffrn_reflns_theta_max         27.52
_diffrn_reflns_theta_min         2.18
_diffrn_standards_decay_%        ' < 0.1 '
_exptl_absorpt_coefficient_mu    1.182
_exptl_absorpt_correction_T_max  0.7980
_exptl_absorpt_correction_T_min  0.7409
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SORTAV: Blessing, 1997)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.184
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       block
_exptl_crystal_F_000             1120
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.335
_refine_diff_density_min         -0.458
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.090(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.067
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     313
_refine_ls_number_reflns         3472
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.0580
_refine_ls_R_factor_gt           0.0409
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0427P)^2^+1.6593P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0929
_refine_ls_wR_factor_ref         0.1035
_reflns_number_gt                2812
_reflns_number_total             3472
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b207302a.txt
_cod_data_source_block           Compound_1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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      ' Pna21 '
_cod_database_code               7012064