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_7019363
_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_compound_source        'synthesis as described'
_chemical_formula_moiety         'C18 H15 As1 Br4'
_chemical_formula_sum            'C18 H15 As Br4'
_chemical_formula_weight         625.7
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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             2011-03-03T12:18:33-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 118.0210(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.0850(2)
_cell_length_b                   10.8700(2)
_cell_length_c                   20.3397(5)
_cell_measurement_reflns_used    8038
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      0.998
_cell_measurement_wavelength     0.71073
_cell_volume                     1968.34(7)
_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      100(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_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      -0.745392E-1
_diffrn_orient_matrix_UB_12      0.103657E-1
_diffrn_orient_matrix_UB_13      0.34855E-1
_diffrn_orient_matrix_UB_21      0.637474E-1
_diffrn_orient_matrix_UB_22      -0.87962E-2
_diffrn_orient_matrix_UB_23      0.43442E-1
_diffrn_orient_matrix_UB_31      0.14863E-1
_diffrn_orient_matrix_UB_32      0.909961E-1
_diffrn_orient_matrix_UB_33      -0.5768E-3
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0915
_diffrn_reflns_av_unetI/netI     0.0648
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            14127
_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
_diffrn_reflns_theta_max         26
_diffrn_reflns_theta_min         2.94
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    9.843
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    2.111
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1184
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.397
_refine_diff_density_min         -1.106
_refine_diff_density_rms         0.218
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.996
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     208
_refine_ls_number_reflns         3868
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.996
_refine_ls_R_factor_all          0.081
_refine_ls_R_factor_gt           0.0496
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0917P)^2^+3.7795P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1293
_refine_ls_wR_factor_ref         0.153
_reflns_number_gt                2753
_reflns_number_total             3868
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c2dt30235g.txt
_cod_data_source_block           rob12
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7019363