TeX4 (X = F, Cl, Br) as Lewis acids‒complexes with soft thio- and seleno-ether ligands.
Hector, Andrew L.; Jolleys, Andrew; Levason, William; Reid, Gillian; Dalton transactions (Cambridge, England : 2003) 41 (2012) 10988–10999; doi:10.1039/c2dt30968h

data_7020207
_publ_section_title
;
 TeX4 (X = F, Cl, Br) as Lewis acids--complexes with soft thio- and
 seleno-ether ligands.
;
_journal_issue                   36
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              10988
_journal_page_last               10999
_journal_paper_doi               10.1039/c2dt30968h
_journal_volume                  41
_journal_year                    2012
_chemical_formula_moiety         'C4 H12 Br4 Se2 Te'
_chemical_formula_sum            'C4 H12 Br4 Se2 Te'
_chemical_formula_weight         665.30
_chemical_name_systematic
;
tetrabromo(methylselanylmethane-Se)tellurium(IV)
;
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2011-12-27
_audit_creation_method           'SHELXL-97 + hand edit'
_cell_angle_alpha                90.00
_cell_angle_beta                 107.967(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.720(2)
_cell_length_b                   13.138(4)
_cell_length_c                   8.486(3)
_cell_measurement_reflns_used    2889
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31.4
_cell_measurement_theta_min      2.5
_cell_volume                     712.7(4)
_computing_cell_refinement
'CrystalClear-SM Expert 2.0 r7 (Rigaku, 2011)'
_computing_data_collection
'CrystalClear-SM Expert 2.0 r7 (Rigaku, 2011)'
_computing_data_reduction
'CrystalClear-SM Expert 2.0 r7 (Rigaku, 2011)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_type            'Rigaku HG Saturn724+ (2x2 bin mode)'
_diffrn_measured_fraction_theta_full 0.949
_diffrn_measured_fraction_theta_max 0.949
_diffrn_measurement_device       'Four-circle \k diffractometer'
_diffrn_measurement_device_type  'Rigaku AFC12 '
_diffrn_measurement_method       'Profile data from \w-scans'
_diffrn_radiation_collimation    'Confocal mirrors, HF VariMax '
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0200
_diffrn_reflns_av_sigmaI/netI    0.0335
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2502
_diffrn_reflns_theta_full        26.37
_diffrn_reflns_theta_max         26.37
_diffrn_reflns_theta_min         2.96
_diffrn_source                   'Rotating anode X-ray tube'
_diffrn_source_type              'Rigaku FR-E+ SuperBright'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    18.361
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.618
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;Jacobson, R.A. (1998). REQAB. Private communication to the
Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_colour            black
_exptl_crystal_density_diffrn    3.100
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             592
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.466
_refine_diff_density_min         -0.566
_refine_diff_density_rms         0.130
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.951
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     54
_refine_ls_number_reflns         1387
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.951
_refine_ls_R_factor_all          0.0226
_refine_ls_R_factor_gt           0.0198
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0140P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0355
_refine_ls_wR_factor_ref         0.0362
_reflns_number_gt                1261
_reflns_number_total             1387
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c2dt30968h.txt
_cod_data_source_block           11aj0108c
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               7020207