Methylene-bis[(aminomethyl)phosphinic acids]: synthesis, acid-base and coordination properties.
David, Tomáš; Procházková, Soňa; Havlíčková, Jana; Kotek, Jan; Kubíček, Vojtěch; Hermann, Petr; Lukeš, Ivan; Dalton transactions (Cambridge, England : 2003) 42 (2013) 2414–2422; doi:10.1039/c2dt32045b

data_7020818
_publ_section_title
;
 Methylene-bis[(aminomethyl)phosphinic acids]: synthesis, acid-base and
 coordination properties.
;
_journal_issue                   7
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2414
_journal_page_last               2422
_journal_paper_doi               10.1039/c2dt32045b
_journal_volume                  42
_journal_year                    2013
_chemical_compound_source        'synthesized by the authors'
_chemical_formula_moiety         'C4 H14 N2 O5 P2, 0.5(H2 O)'
_chemical_formula_sum            'C4 H15 N2 O5.5 P2'
_chemical_formula_weight         241.12
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 101.2530(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   16.4183(4)
_cell_length_b                   6.7200(2)
_cell_length_c                   17.8230(4)
_cell_measurement_reflns_used    6599
_cell_measurement_temperature    150(1)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      3.1
_cell_volume                     1928.62(9)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(1)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \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  0.0200
_diffrn_reflns_av_sigmaI/netI    0.0165
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            11754
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.33
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.454
_exptl_absorpt_correction_T_max  0.9569
_exptl_absorpt_correction_T_min  0.8209
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.661
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1016
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.31
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.489
_refine_diff_density_min         -0.262
_refine_diff_density_rms         0.058
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.077
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     124
_refine_ls_number_reflns         2218
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.077
_refine_ls_R_factor_all          0.0302
_refine_ls_R_factor_gt           0.0261
_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^)+(0.0376P)^2^+2.6664P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0713
_refine_ls_wR_factor_ref         0.0739
_reflns_number_gt                2003
_reflns_number_total             2218
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt32045b.txt
_cod_data_source_block           at1bpin
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_original_formula_sum        'C4 H15 N2 O5.50 P2'
_cod_database_code               7020818