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_7014073
_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            'C96 H140 Cl2 Li4 N8 O12 P2'
_chemical_formula_weight         1758.76
_space_group_IT_number           1
_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                107.012(9)
_cell_angle_beta                 105.860(9)
_cell_angle_gamma                90.125(9)
_cell_formula_units_Z            1
_cell_length_a                   13.135(7)
_cell_length_b                   13.475(7)
_cell_length_c                   15.345(8)
_cell_measurement_temperature    150(2)
_cell_volume                     2488(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker SMART 1000'
_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  0.0430
_diffrn_reflns_av_sigmaI/netI    0.0700
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            16519
_diffrn_reflns_theta_full        22.49
_diffrn_reflns_theta_max         22.49
_diffrn_reflns_theta_min         1.45
_exptl_absorpt_coefficient_mu    0.158
_exptl_absorpt_correction_type   'not applied'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.174
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.769
_refine_diff_density_min         -0.401
_refine_diff_density_rms         0.077
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.63(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1117
_refine_ls_number_reflns         12350
_refine_ls_number_restraints     1599
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.1332
_refine_ls_R_factor_gt           0.0939
_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^)+(0.1651P)^2^+3.7687P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2457
_refine_ls_wR_factor_ref         0.2791
_reflns_number_gt                8772
_reflns_number_total             12350
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b400798k.txt
_cod_data_source_block           3Li2Clthf6
_cod_original_sg_symbol_H-M      P1
_cod_database_code               7014073