Preference for a C3 conformation in tris-dimethylaminophosphonium cations: a comparison of the reactions of (Me2N)3P with I-X (X = Cl, Br, I, CN).
Barnes, Nicholas A.; Godfrey, Stephen M.; Halton, Ruth T. A.; Pritchard, Robin G.; Safi, Zaki; Sheffield, Joanne M.; Dalton transactions (Cambridge, England : 2003)  (2007) 3252–3258; doi:10.1039/b705651f

data_7005818
_publ_section_title
;
 Preference for a C3 conformation in tris-dimethylaminophosphonium
 cations: a comparison of the reactions of (Me2N)3P with I-X (X = Cl,
 Br, I, CN).
;
_journal_issue                   30
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              3252
_journal_page_last               3258
_journal_paper_doi               10.1039/b705651f
_journal_year                    2007
_chemical_absolute_configuration ad
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C6 H18 Br0.50 Cl0.50 I1 N3 P1'
_chemical_formula_sum            'C6 H18 Br0.5 Cl0.5 I N3 P'
_chemical_formula_weight         347.78
_chemical_name_systematic
;
?
;
_space_group_IT_number           160
_symmetry_cell_setting           trigonal
_symmetry_Int_Tables_number      160
_symmetry_space_group_name_Hall  'R 3 -2"'
_symmetry_space_group_name_H-M   'R 3 m :H'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.3
_audit_creation_date             2006-07-21T12:49:05-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            3
_cell_length_a                   8.2719(9)
_cell_length_b                   8.2719(9)
_cell_length_c                   16.646(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    183(2)
_cell_measurement_theta_max      18
_cell_measurement_theta_min      12
_cell_measurement_wavelength     0.71073
_cell_volume                     986.40(19)
_computing_cell_refinement       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_collection       'CAD4 Express (Enraf Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1986)'
_diffrn_ambient_temperature      183(2)
_diffrn_detector                 'scintillation LiI'
_diffrn_detector_dtime           1.195
_diffrn_measured_fraction_theta_full 0.934
_diffrn_measured_fraction_theta_max 0.934
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf Nonius CAD4'
_diffrn_measurement_method       'non-profiled omega/2theta scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.1063
_diffrn_reflns_av_unetI/netI     0.0691
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            481
_diffrn_reflns_theta_full        24.97
_diffrn_reflns_theta_max         24.97
_diffrn_reflns_theta_min         3.1
_diffrn_source                   'Enraf Nonius FR590'
_diffrn_standards_decay_%        1
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    4.142
_exptl_absorpt_correction_T_max  0.6822
_exptl_absorpt_correction_T_min  0.5755
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details
;
North A.C.T., Phillips D.C. & Mathews F.S. (1968) Acta. Cryst. A24, 351
Number of psi-scan sets used was 3
Theta correction was applied.
Averaged transmission function was used.
No Fourier smoothing was applied.
;
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.756
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             507
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.702
_refine_diff_density_min         -0.63
_refine_diff_density_rms         0.106
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.13(15)
_refine_ls_extinction_coef       0.0026(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.158
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     53
_refine_ls_number_reflns         230
_refine_ls_number_restraints     11
_refine_ls_restrained_S_all      1.131
_refine_ls_R_factor_all          0.0261
_refine_ls_R_factor_gt           0.0261
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0322P)^2^+0.7530P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0612
_refine_ls_wR_factor_ref         0.0612
_reflns_number_gt                230
_reflns_number_total             230
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b705651f.txt
_cod_data_source_block           sg183b
_cod_original_sg_symbol_Hall     'R 3 -2'
_cod_original_sg_symbol_H-M      'R 3 m'
_cod_original_formula_sum        'C6 H18 Br0.50 Cl0.50 I N3 P'
_cod_database_code               7005818