Metal–silicon triple bonds: reactivity of the silylidyne complexes [Cp*(CO)2M≡Si–Tbb] (M = Cr – W)
Tomer, Kanishk; Schnakenburg, Gregor; Das, Ujjal; Filippou, Alexander C.; Chemical Science 16 (2025) 7773–7793; doi:10.1039/D5SC01063B

data_1574214
_publ_section_title
;
 Metal--silicon triple bonds: reactivity of the silylidyne complexes
 [Cp*(CO)2M\\tb Si--Tbb] (M = Cr -- W)
;
_journal_issue                   18
_journal_name_full               'Chemical Science'
_journal_page_first              7773
_journal_page_last               7793
_journal_paper_doi               10.1039/D5SC01063B
_journal_volume                  16
_journal_year                    2025
_chemical_formula_moiety         'C40 H72 Mo O3 Si5'
_chemical_formula_sum            'C40 H72 Mo O3 Si5'
_chemical_formula_weight         837.36
_chemical_name_systematic        KT-284
_space_group_crystal_system      orthorhombic
_space_group_IT_number           61
_space_group_name_Hall           '-P 2ac 2ab'
_space_group_name_H-M_alt        'P b c a'
_atom_sites_solution_hydrogens   mixed
_audit_creation_date             2022-01-25
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2025-02-04 deposited with the CCDC.	2025-03-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   17.438(3)
_cell_length_b                   16.527(3)
_cell_length_c                   33.683(10)
_cell_measurement_reflns_used    12339
_cell_measurement_temperature    123
_cell_measurement_theta_max      25.08
_cell_measurement_theta_min      2.48
_cell_volume                     9707(4)
_computing_cell_refinement       'STOE X-AREA'
_computing_data_collection       'STOE X-AREA'
_computing_data_reduction        'STOE X-RED'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_diffrn_ambient_temperature      123
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            STOE
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_details
;
 224 frames, detector distance = 160 mm
;
_diffrn_measurement_device       '2-circle goniometer'
_diffrn_measurement_device_type  'STOE IPDS-2T'
_diffrn_measurement_method       'rotation method'
_diffrn_radiation_collimation    '0.5 mm diameter, monocapillary'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  0
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1425
_diffrn_reflns_av_unetI/netI     0.1150
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       40
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            46377
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.247
_diffrn_reflns_theta_min         2.485
_diffrn_source
'sealed X-ray tube, 12 x 0.4 mm long-fine focus'
_diffrn_source_current           40
_diffrn_source_power             2.00
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    0.425
_exptl_absorpt_correction_T_max  0.9300
_exptl_absorpt_correction_T_min  0.8207
_exptl_absorpt_correction_type   integration
_exptl_crystal_colour            'clear light yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   light
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.146
_exptl_crystal_description       plate
_exptl_crystal_F_000             3584
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.810
_refine_diff_density_min         -0.589
_refine_diff_density_rms         0.100
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     497
_refine_ls_number_reflns         8747
_refine_ls_number_restraints     149
_refine_ls_restrained_S_all      1.046
_refine_ls_R_factor_all          0.1427
_refine_ls_R_factor_gt           0.0894
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 w=1/[\s^2^(Fo^2^)+(0.0945P)^2^+1.0362P]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1756
_refine_ls_wR_factor_ref         0.1954
_reflns_Friedel_coverage         0.000
_reflns_number_gt                5407
_reflns_number_total             8747
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5sc01063b2.cif
_cod_data_source_block           3-Mo
_cod_depositor_comments
'Adding full bibliography for 1574207--1574214.cif.'
_cod_database_code               1574214
_shelxl_version_number           2013-2
_shelx_estimated_absorpt_t_max   0.975
_shelx_estimated_absorpt_t_min   0.935
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All Mo(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Restrained distances
 C27-C26
 1.5 with sigma of 0.01
 C15S-C14 = C17S-C14
 1.5 with sigma of 0.01
 C17S-C15S
 2.5 with sigma of 0.01
 C17S-C16S
 2.4 with sigma of 0.01
3. Rigid bond restraints
 O1, C25
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.001
 C27, C28
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.001
 C29, C33
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.001
 C29, C34
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.001
 C26, C27
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.001
 C25, C26
 with sigma for 1-2 distances of 0.001 and sigma for 1-3 distances of 0.001
4. Uiso/Uaniso restraints and constraints
C17S \\sim C16 \\sim C16S \\sim C15 \\sim C15S \\sim C17 \\sim C14: within 2A
with sigma of 0.01 and sigma for terminal atoms of 0.02
Uanis(C14) \\sim Ueq, Uanis(C17) \\sim Ueq, Uanis(C16) \\sim Ueq, Uanis(C15)
\\sim Ueq, Uanis(C15S) \\sim Ueq, Uanis(C16S) \\sim Ueq, Uanis(C17S) \\sim Ueq:
with sigma of 0.001 and sigma for terminal atoms of 0.002
Uanis(C28) \\sim Ueq, Uanis(C27) \\sim Ueq, Uanis(C26) \\sim Ueq: with sigma of
0.001 and sigma for terminal atoms of 0.002
Uanis(C34) \\sim Ueq: with sigma of 0.001 and sigma for terminal atoms of 0.002
Uanis(C25) \\sim Ueq, Uanis(C29) \\sim Ueq: with sigma of 0.001 and sigma for
terminal atoms of 0.002
5. Others
 Sof(C15S)=Sof(H15D)=Sof(H15E)=Sof(H15F)=Sof(C16S)=Sof(H16D)=Sof(H16E)=
 Sof(H16F)=Sof(C17S)=Sof(H17D)=Sof(H17E)=Sof(H17F)=1-FVAR(1)
 Sof(C15)=Sof(H15A)=Sof(H15B)=Sof(H15C)=Sof(C16)=Sof(H16A)=Sof(H16B)=Sof(H16C)=
 Sof(C17)=Sof(H17A)=Sof(H17B)=Sof(H17C)=FVAR(1)
6.a Ternary CH refined with riding coordinates:
 C7(H7), C18(H18)
6.b Secondary CH2 refined with riding coordinates:
 C27(H27A,H27B)
6.c Aromatic/amide H refined with riding coordinates:
 C3(H3), C5(H5), C25(H25), C26(H26)
6.d Idealised Me refined as rotating group:
 C8(H8A,H8B,H8C), C9(H9A,H9B,H9C), C10(H10A,H10B,H10C), C11(H11A,H11B,H11C),
 C12(H12A,H12B,H12C), C13(H13A,H13B,H13C), C15(H15A,H15B,H15C), C15S(H15D,H15E,
 H15F), C16(H16A,H16B,H16C), C16S(H16D,H16E,H16F), C17(H17A,H17B,H17C),
 C17S(H17D,H17E,H17F), C19(H19A,H19B,H19C), C20(H20A,H20B,H20C), C21(H21A,H21B,
 H21C), C22(H22A,H22B,H22C), C23(H23A,H23B,H23C), C24(H24A,H24B,H24C), C28(H28A,
 H28B,H28C), C34(H34A,H34B,H34C), C35(H35A,H35B,H35C), C36(H36A,H36B,H36C),
 C37(H37A,H37B,H37C), C38(H38A,H38B,H38C)
;
_shelx_res_checksum              34517
_olex2_submission_special_instructions 'No special instructions were received'