Spontaneous Generation of Stable Pnictinyl Radicals from "Jack-in-the-Box" Dipnictines: A Solid-State, Gas-Phase, and Theoretical Investigation of the Origins of Steric Stabilization1
Sarah L. Hinchley; Carole A. Morrison; David W. H. Rankin; Charles L. B. Macdonald; Robert J. Wiacek; Andreas Voigt; Alan H. Cowley; Michael F. Lappert; Grete Gundersen; Jason A. C. Clyburne; Philip P. Power; Journal of the American Chemical Society 123 (2001) 9045–9053; doi:10.1021/ja010615b

data_4115690
_publ_section_title
;
 Spontaneous Generation of Stable Pnictinyl Radicals from
 "Jack-in-the-Box" Dipnictines: A Solid-State, Gas-Phase, and Theoretical
 Investigation of the Origins of Steric Stabilization1
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              9045
_journal_page_last               9053
_journal_paper_doi               10.1021/ja010615b
_journal_volume                  123
_journal_year                    2001
_chemical_compound_source        selfmade
_chemical_formula_moiety         'C28 H76 As2 Si8'
_chemical_formula_structural     'C28 H76 As2 Si8'
_chemical_formula_sum            'C28 H76 As2 Si8'
_chemical_formula_weight         787.45
_chemical_name_common            tetra(disyl)diarsine
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                102.11(3)
_cell_angle_beta                 104.54(3)
_cell_angle_gamma                102.35(3)
_cell_formula_units_Z            16
_cell_length_a                   20.348(4)
_cell_length_b                   26.342(5)
_cell_length_c                   37.012(7)
_cell_measurement_reflns_used    n/a
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      n/a
_cell_measurement_theta_min      n/a
_cell_volume                     18016(8)
_computing_cell_refinement       DENZO-SMN
_computing_data_collection       'Collect software, Nonius B.V. 1998'
_computing_data_reduction        DENZO-SMN
_computing_molecular_graphics    'SHELXTL-Plus, XP, Siemens, 1994'
_computing_publication_material  'SHELXTL-Plus, XCIF, Siemens, 1994'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(2)
_diffrn_measurement_device       'Nonius KAPPA-CCD'
_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  0.0614
_diffrn_reflns_av_sigmaI/netI    0.0524
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       48
_diffrn_reflns_limit_l_min       -42
_diffrn_reflns_number            100000
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         2.92
_diffrn_standards_decay_%        n/a
_diffrn_standards_interval_count n/a
_diffrn_standards_number         n/a
_exptl_absorpt_coefficient_mu    1.713
_exptl_absorpt_correction_T_max  n/a
_exptl_absorpt_correction_T_min  n/a
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.161
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    n/a
_exptl_crystal_description       paralellepiped
_exptl_crystal_F_000             6752
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.536
_refine_diff_density_min         -0.522
_refine_diff_density_rms         0.062
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.511
_refine_ls_goodness_of_fit_obs   1.713
_refine_ls_matrix_type           fullcycle
_refine_ls_number_parameters     2737
_refine_ls_number_reflns         27654
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.519
_refine_ls_restrained_S_obs      1.713
_refine_ls_R_factor_all          0.0913
_refine_ls_R_factor_obs          0.0531
_refine_ls_shift/esd_max         -2.089
_refine_ls_shift/esd_mean        0.059
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0431P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1344
_refine_ls_wR_factor_obs         0.1213
_reflns_number_observed          18677
_reflns_number_total             27687
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ja010615b_4.cif
_cod_data_source_block           final
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'n/a' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0431P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0431P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        18015.1(63)
_cod_database_code               4115690