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_7019357
_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 I4'
_chemical_formula_sum            'C18 H15 As I4'
_chemical_formula_weight         813.7
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_Int_Tables_number      62
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_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             2010-07-07T13:29:22-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   12.2801(2)
_cell_length_b                   38.8869(9)
_cell_length_c                   9.13000(10)
_cell_measurement_reflns_used    5394
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      52
_cell_measurement_theta_min      2
_cell_measurement_wavelength     0.71073
_cell_volume                     4359.89(13)
_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    'DIRDIF99 (Beurskens et al, 1999)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.99
_diffrn_measured_fraction_theta_max 0.99
_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      -0.537006E-1
_diffrn_orient_matrix_UB_12      0.154205E-1
_diffrn_orient_matrix_UB_13      0.218774E-1
_diffrn_orient_matrix_UB_21      0.899396E-1
_diffrn_orient_matrix_UB_22      -0.184662E-1
_diffrn_orient_matrix_UB_23      0.134678E-1
_diffrn_orient_matrix_UB_31      0.319916E-1
_diffrn_orient_matrix_UB_32      0.777997E-1
_diffrn_orient_matrix_UB_33      -0.11396E-2
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.093
_diffrn_reflns_av_unetI/netI     0.0459
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       47
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            13398
_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        25.5
_diffrn_reflns_theta_max         25.5
_diffrn_reflns_theta_min         3.14
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    7.222
_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            red
_exptl_crystal_density_diffrn    2.479
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2944
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.05
_refine_diff_density_max         2.517
_refine_diff_density_min         -1.876
_refine_diff_density_rms         0.367
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.18
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     214
_refine_ls_number_reflns         4078
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.18
_refine_ls_R_factor_all          0.1205
_refine_ls_R_factor_gt           0.079
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0432P)^2^+193.9326P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1669
_refine_ls_wR_factor_ref         0.1965
_reflns_number_gt                2709
_reflns_number_total             4078
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            c2dt30235g.txt
_cod_data_source_block           new6
_cod_original_cell_volume        4359.87(13)
_cod_database_code               7019357