Structural isomerism in tris-tolyl halo-phosphonium and halo-arsonium tri-halides, [(CH(3)C(6)H(4))(3)EX][X(3)], (E = P, As; X = Br, I).
Alhanash, Fatma B.; Barnes, Nicholas A.; Godfrey, Stephen M.; Hurst, Paul A.; Hutchinson, Adrian; Khan, Rana Z.; Pritchard, Robin G.; Dalton transactions (Cambridge, England : 2003) 41 (2012) 7708–7728; doi:10.1039/c2dt30235g

data_7019362
_publ_section_title
;
 Structural isomerism in tris-tolyl halo-phosphonium and halo-arsonium
 tri-halides, [(CH(3)C(6)H(4))(3)EX][X(3)], (E = P, As; X = Br, I).
;
_journal_issue                   25
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7708
_journal_page_last               7728
_journal_paper_doi               10.1039/c2dt30235g
_journal_volume                  41
_journal_year                    2012
_chemical_absolute_configuration unk
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C21 H21 As1 Br4'
_chemical_formula_sum            'C21 H21 As Br4'
_chemical_formula_weight         667.94
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_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      2.4
_audit_creation_date             2011-02-28T00:07:48-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 106.8340(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.2560(2)
_cell_length_b                   11.3603(2)
_cell_length_c                   18.7646(6)
_cell_measurement_reflns_used    5041
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27
_cell_measurement_theta_min      2
_cell_measurement_wavelength     0.71073
_cell_volume                     2296.64(9)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SIR92 (Giacovazzo et al, 1993)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD rotation images, thick slices'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      -0.494859E-1
_diffrn_orient_matrix_UB_12      -0.735343E-1
_diffrn_orient_matrix_UB_13      -0.157283E-1
_diffrn_orient_matrix_UB_21      -0.73991E-1
_diffrn_orient_matrix_UB_22      0.38999E-1
_diffrn_orient_matrix_UB_23      0.90068E-2
_diffrn_orient_matrix_UB_31      -0.263022E-1
_diffrn_orient_matrix_UB_32      0.286415E-1
_diffrn_orient_matrix_UB_33      -0.52645E-1
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.091
_diffrn_reflns_av_unetI/netI     0.0724
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            19739
_diffrn_reflns_reduction_process
;
Scaled and merged with Sortav
R.H. Blessing, (1987) Cryst. Rev. 1, 3-58
R.H. Blessing, (1989) J. Appl. Cryst. 22, 396-397
;
_diffrn_reflns_theta_full        26.5
_diffrn_reflns_theta_max         26.5
_diffrn_reflns_theta_min         3.05
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    8.443
_exptl_absorpt_correction_T_max  0.7141
_exptl_absorpt_correction_T_min  0.2654
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
R.H. Blessing, Acta Cryst. (1995), A51, 33-38
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.932
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1280
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.959
_refine_diff_density_min         -1.031
_refine_diff_density_rms         0.189
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.53(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     476
_refine_ls_number_reflns         4974
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0775
_refine_ls_R_factor_gt           0.0519
_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^)+(0.0731P)^2^+4.5428P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1195
_refine_ls_wR_factor_ref         0.1337
_reflns_number_gt                3874
_reflns_number_total             4974
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c2dt30235g.txt
_cod_data_source_block           rob11
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7019362