Guanidinophosphazenes: Design, Synthesis, and Basicity in THF and in the Gas Phase
Alexander A. Kolomeitsev; Ilmar A. Koppel; Toomas Rodima; Jan Barten; Enno Lork; Gerd-Volker Röschenthaler; Ivari Kaljurand; Agnes Kütt; Ivar Koppel; Vahur Mäemets; Ivo Leito; Journal of the American Chemical Society 127 (2005) 17656–17666; doi:10.1021/ja053543n

data_4112114
_publ_section_title
;
 Guanidinophosphazenes: Design, Synthesis, and Basicity in THF and in the
 Gas Phase
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17656
_journal_page_last               17666
_journal_paper_doi               10.1021/ja053543n
_journal_volume                  127
_journal_year                    2005
_chemical_formula_moiety         'C19 H45 N10 P'
_chemical_formula_sum            'C19 H45 N10 P'
_chemical_formula_weight         444.62
_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                   11.222(2)
_cell_length_b                   11.981(2)
_cell_length_c                   19.807(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      12.55
_cell_measurement_theta_min      4.92
_cell_volume                     2663.1(8)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens XSCANS'
_computing_molecular_graphics    Diamond
_computing_publication_material  Ciftab
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       '2\q/\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0231
_diffrn_reflns_av_sigmaI/netI    0.0418
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            7701
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.67
_diffrn_standards_decay_%        'random variation +/-2.0'
_diffrn_standards_interval_count 197
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.128
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.109
_exptl_crystal_description       blocks
_exptl_crystal_F_000             976
_exptl_crystal_size_max          1.0
_exptl_crystal_size_mid          0.8
_exptl_crystal_size_min          0.5
_refine_diff_density_max         0.301
_refine_diff_density_min         -0.334
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.02(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    refU
_refine_ls_matrix_type           full
_refine_ls_number_parameters     287
_refine_ls_number_reflns         5865
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.0500
_refine_ls_R_factor_gt           0.0403
_refine_ls_shift/su_max          0.008
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0597P)^2^+0.2859P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0990
_refine_ls_wR_factor_ref         0.1048
_reflns_number_gt                5158
_reflns_number_total             5865
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja053543nsi20050613_103418.cif
_cod_data_source_block           ak32
_cod_database_code               4112114