Stable lead(ii) boroxides.
Someşan, Adrian-Alexandru; Le Coz, Erwann; Roisnel, Thierry; Silvestru, Cristian; Sarazin, Yann; Chemical communications (Cambridge, England) 54 (2018) 5299–5302; doi:10.1039/c8cc02459f

data_1549258
_publ_section_title
;
 Stable lead(ii) boroxides.
;
_journal_issue                   42
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              5299
_journal_page_last               5302
_journal_paper_doi               10.1039/c8cc02459f
_journal_volume                  54
_journal_year                    2018
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C28 H76 B2 O2 Si8 Sn'
_chemical_formula_sum            'C28 H76 B2 O2 Si8 Sn'
_chemical_formula_weight         809.91
_chemical_properties_physical    Air-sensitive,Moisture-sensitive
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_audit_update_record
;
2018-03-26 deposited with the CCDC.
2018-04-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 123.9170(10)
_cell_angle_gamma                90
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_cell_length_b                   18.1907(6)
_cell_length_c                   24.6824(7)
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_cell_measurement_temperature    150(2)
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_cell_measurement_theta_min      2.45
_cell_measurement_wavelength     0.71073
_cell_volume                     9379.6(5)
_computing_cell_refinement       'APEX3 (Bruker, 2015); SAINT (Bruker, 2014)'
_computing_data_collection       'SAINT (Bruker, 2014)'
_computing_data_reduction        'SAINT (Bruker, 2014)'
_computing_molecular_graphics
'SXGRAPH (Farrugia, 1999), Mercury (CSD, 2014)'
_computing_publication_material  'CRYSCALC (T. Roisnel, local program, 2016)'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_structure_solution    'SHELXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 '(CMOS) PHOTON 100'
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'D8 VENTURE Bruker AXS'
_diffrn_measurement_method       'rotation images'
_diffrn_radiation_monochromator  'multilayer monochromator'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'Incoatec microfocus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0617
_diffrn_reflns_av_unetI/netI     0.0488
_diffrn_reflns_limit_h_max       32
_diffrn_reflns_limit_h_min       -32
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -32
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_diffrn_reflns_theta_max         27.484
_diffrn_reflns_theta_min         2.970
_exptl_absorpt_coefficient_mu    0.771
_exptl_absorpt_correction_T_max  0.775
_exptl_absorpt_correction_T_min  0.682
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
  [Sheldrick, G.M. (2014). SADABS Bruker AXS Inc., Madison, Wisconsin, USA]
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.147
_exptl_crystal_description       prism
_exptl_crystal_F_000             3456
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: pentane'
_exptl_crystal_size_max          0.600
_exptl_crystal_size_mid          0.520
_exptl_crystal_size_min          0.330
_refine_diff_density_max         2.423
_refine_diff_density_min         -1.925
_refine_diff_density_rms         0.082
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.012
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     394
_refine_ls_number_reflns         10742
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.012
_refine_ls_R_factor_all          0.0654
_refine_ls_R_factor_gt           0.0398
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0241P)^2^+26.9267P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_refine_ls_wR_factor_ref         0.0858
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_reflns_threshold_expression     >2sigma(I)
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'Adding full bibliography for 1549257--1549261.cif.'
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