Tuning Lewis acidity using the reactivity of "frustrated Lewis pairs": facile formation of phosphine-boranes and cationic phosphonium-boranes.
Welch, Gregory C.; Cabrera, Lourdes; Chase, Preston A.; Hollink, Emily; Masuda, Jason D.; Wei, Pingrong; Stephan, Douglas W.; Dalton transactions (Cambridge, England : 2003)  (2007) 3407–3414; doi:10.1039/b704417h

data_7005688
_publ_section_title
;
 Tuning Lewis acidity using the reactivity of "frustrated Lewis pairs":
 facile formation of phosphine-boranes and cationic
 phosphonium-boranes.
;
_journal_issue                   31
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3407
_journal_page_last               3414
_journal_paper_doi               10.1039/b704417h
_journal_year                    2007
_chemical_formula_sum            'C26 H20 B F14 P'
_chemical_formula_weight         640.20
_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-97
_cell_angle_alpha                67.652(2)
_cell_angle_beta                 76.712(3)
_cell_angle_gamma                88.612(2)
_cell_formula_units_Z            4
_cell_length_a                   9.6218(12)
_cell_length_b                   17.225(2)
_cell_length_c                   18.468(2)
_cell_measurement_temperature    273(2)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      2.0
_cell_volume                     2748.3(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      273(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0278
_diffrn_reflns_av_sigmaI/netI    0.0419
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            13680
_diffrn_reflns_theta_full        23.33
_diffrn_reflns_theta_max         23.33
_diffrn_reflns_theta_min         2.09
_exptl_absorpt_coefficient_mu    0.211
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.547
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1288
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.960
_refine_diff_density_min         -0.329
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     785
_refine_ls_number_reflns         7884
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0793
_refine_ls_R_factor_gt           0.0548
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1026P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1537
_refine_ls_wR_factor_ref         0.1684
_reflns_number_gt                5320
_reflns_number_total             7884
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b704417h.txt
_cod_data_source_block           t-Bu2PHC6F4BH(C6F5)2
_cod_original_cell_volume        2748.4(6)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7005688