Superbasic bridgehead diphosphines: the effects of strain and intrabridgehead P · · · P bonding on phosphine basicity
Alder, Roger W.; Butts, Craig P.; Orpen, A. Guy; Read, David; Oliva, Josep M.; Journal of the Chemical Society, Perkin Transactions 2  (2001) 282–; doi:10.1039/b008903f

data_7216945
_publ_section_title
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 Superbasic bridgehead diphosphines: the effects of strain and
 intrabridgehead
 P&#x200A;&#x200A;&#x00B7;&#x2005;&#x00B7;&#x2005;&#x00B7;&#x200A;&#x200A;P
 bonding on phosphine basicity
;
_journal_issue                   3
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 2'
_journal_page_first              282
_journal_paper_doi               10.1039/b008903f
_journal_year                    2001
_chemical_formula_sum            'C12 H25 F6 P3'
_chemical_formula_weight         376.23
_chemical_name_systematic
; 
? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8764(9)
_cell_length_b                   13.8784(18)
_cell_length_c                   15.1380(17)
_cell_measurement_reflns_used    242
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      1.75
_cell_volume                     1654.8(3)
_computing_cell_refinement       'SMART (Siemens, 1995b)'
_computing_data_collection       'SMART (Siemens, 1995b)'
_computing_data_reduction        'SMART (Siemens, 1995b)'
_computing_molecular_graphics    'SHELXTL (Siemens, 1995a)'
_computing_publication_material  'SHELXTL (Siemens, 1995a)'
_computing_structure_refinement  'SHELXTL (Siemens, 1995a)'
_computing_structure_solution    'SHELXTL (Siemens, 1995a)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Siemens SMART Area Detector'
_diffrn_measurement_method       '\w rotation with narrow frames'
_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  0.0277
_diffrn_reflns_av_sigmaI/netI    0.0181
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            10631
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         1.99
_exptl_absorpt_coefficient_mu    0.409
_exptl_absorpt_correction_T_max  0.8154
_exptl_absorpt_correction_T_min  0.7627
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.510
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'Irregular Block'
_exptl_crystal_F_000             784
_exptl_crystal_size_max          0.70
_exptl_crystal_size_mid          0.60
_exptl_crystal_size_min          0.52
_refine_diff_density_max         0.458
_refine_diff_density_min         -0.354
_refine_diff_density_rms         0.046
_refine_ls_abs_structure_details
'Flack H D (1983), Acta Cryst. A39, 876-881, 1591 Friedel pairs'
_refine_ls_abs_structure_Flack   0.01(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     195
_refine_ls_number_reflns         3771
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0259
_refine_ls_R_factor_gt           0.0254
_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^)+(0.0356P)^2^+0.6459P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0669
_refine_ls_wR_factor_ref         0.0676
_reflns_number_gt                3717
_reflns_number_total             3771
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b008903f.txt
_cod_data_source_block           dr1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7216945