On the mechanisms of degenerate halogen exchange in phosphorus(iii) halides
Renard, Sylvie L.; Fisher, Julie; Kilner, Colin A.; Thornton-Pett, Mark; Kee, Terence P.; Journal of the Chemical Society, Dalton Transactions  (2002) 2921–; doi:10.1039/b202942c

data_7011690
_publ_section_title
;
 On the mechanisms of degenerate halogen exchange in phosphorus(iii)
 halides
;
_journal_issue                   14
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              2921
_journal_paper_doi               10.1039/b202942c
_journal_year                    2002
_chemical_formula_sum            'C22 H22 Cl N4 P'
_chemical_formula_weight         408.86
_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                   7.4730(3)
_cell_length_b                   15.6217(9)
_cell_length_c                   17.9713(9)
_cell_measurement_temperature    150(2)
_cell_volume                     2097.99(18)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1996)'
_computing_data_collection       'COLLECT (Nonius, 1999)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1996)'
_computing_molecular_graphics    'ORTEP3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WC (Thornton-Pett, 2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Nonius KappaCCD area detector diffractometer'
_diffrn_measurement_method
;
Detector set at 30mm from sample with different 2theta offsets 
1 degree phi exposures for chi=0 degree settings
1 degree omega exposures for chi=90 degree settings
;
_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  0.0627
_diffrn_reflns_av_sigmaI/netI    0.0836
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            9792
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         3.46
_exptl_absorpt_coefficient_mu    0.273
_exptl_absorpt_correction_T_max  0.9892
_exptl_absorpt_correction_T_min  0.9398
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Using multiple and symmetry-related data measurements via the program SORTAV
See R.H. Blessing, Acta Cryst (1995), A51, 33-38 
;
_exptl_crystal_colour            colourles
_exptl_crystal_density_diffrn    1.294
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             856
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.322
_refine_diff_density_min         -0.209
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.08(10)
_refine_ls_extinction_coef       0.004(3)
_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   1.097
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     254
_refine_ls_number_reflns         4005
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.097
_refine_ls_R_factor_all          0.0844
_refine_ls_R_factor_gt           0.0528
_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^)+(0.0000P)^2^+0.9760P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0962
_refine_ls_wR_factor_ref         0.1101
_reflns_number_gt                3045
_reflns_number_total             4005
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b202942c.txt
_cod_data_source_block           sr244
_cod_original_sg_symbol_H-M      'P21 21 21'
_cod_database_code               7011690