From the tetra(amino) phosphonium cation, [P(NHPh)4]+, to the tetra(imino) phosphate trianion, [P(NPh)4]3-, two-faced ligands that bind anions and cations.
Bickley, Jamie F.; Copsey, May C.; Jeffery, John C.; Leedham, Angela P.; Russell, Christopher A.; Stalke, Dietmar; Steiner, Alexander; Stey, Thomas; Zacchini, Stefano; Dalton transactions (Cambridge, England : 2003)  (2004) 989–995; doi:10.1039/b400798k

data_7014071
_publ_section_title
;
 From the tetra(amino) phosphonium cation, [P(NHPh)4]+, to the
 tetra(imino) phosphate trianion, [P(NPh)4]3-, two-faced ligands that
 bind anions and cations.
;
_journal_issue                   7
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              989
_journal_page_last               995
_journal_paper_doi               10.1039/b400798k
_journal_year                    2004
_chemical_formula_sum            'C38 H50 Li N4 O3.5 P'
_chemical_formula_weight         656.73
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 94.5120(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   39.229(3)
_cell_length_b                   9.9824(7)
_cell_length_c                   18.6572(13)
_cell_measurement_temperature    150(2)
_cell_volume                     7283.5(9)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX CCD'
_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  0.0524
_diffrn_reflns_av_sigmaI/netI    0.0398
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       -42
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            14961
_diffrn_reflns_theta_full        22.49
_diffrn_reflns_theta_max         22.49
_diffrn_reflns_theta_min         2.08
_exptl_absorpt_coefficient_mu    0.118
_exptl_absorpt_correction_type   'not applied'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2816
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.381
_refine_diff_density_min         -0.302
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.057
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     428
_refine_ls_number_reflns         4754
_refine_ls_number_restraints     294
_refine_ls_restrained_S_all      1.159
_refine_ls_R_factor_all          0.0574
_refine_ls_R_factor_gt           0.0485
_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^)+(0.0695P)^2^+6.8605P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1265
_refine_ls_wR_factor_ref         0.1324
_reflns_number_gt                3991
_reflns_number_total             4754
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b400798k.txt
_cod_data_source_block           3Lithf3
_cod_original_cell_volume        7283.6(9)
_cod_original_sg_symbol_H-M      C2/c
_cod_original_formula_sum        'C38 H50 Li N4 O3.50 P'
_cod_database_code               7014071