#------------------------------------------------------------------------------
#$Date: 2026-03-07 02:13:00 +0100 (Sat 07 de Mar de 2026) $
#$Revision: 304991 $
#$URL: svn://www.crystallography.net/cod/cif/7/72/05/7720594.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_7720594
loop_
_publ_author_name
'Kopp, Richard Otto'
'Coles, Nathan'
'Ernst, Moritz J.'
'Weber, Manuela'
'Ward, Benjamin D.'
'Muller, Christian'
_publ_section_title
;
 Janus-faced coordination chemistry of pyridyl-functionalized phosphinines
 with Cu(I) and Au(I)
;
_journal_name_full               'Dalton Transactions'
_journal_paper_doi               10.1039/D6DT00083E
_journal_year                    2026
_chemical_formula_moiety         'C21 H27 N2 P Si2'
_chemical_formula_sum            'C21 H27 N2 P Si2'
_chemical_formula_weight         394.59
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2025-09-17
_audit_creation_method
;
Olex2 1.5
(compiled 2023.03.06 svn.rbb2c1857 for OlexSys, GUI svn.r6748)
;
_audit_update_record
;
2025-11-14 deposited with the CCDC.	2026-03-02 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 103.1930(10)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.6561(3)
_cell_length_b                   11.9401(4)
_cell_length_c                   9.8357(3)
_cell_measurement_reflns_used    9927
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.753
_cell_measurement_theta_min      2.667
_cell_volume                     1104.08(6)
_computing_cell_refinement       'SAINT V8.38A (?, 2016)'
_computing_data_reduction        'SAINT V8.38A (?, 2016)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'ShelXT (Sheldrick, 2015)'
_diffrn_ambient_temperature      100.0
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'φ and ω scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0525
_diffrn_reflns_av_unetI/netI     0.0408
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            36361
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.557
_diffrn_reflns_theta_min         2.127
_exptl_absorpt_coefficient_mu    0.240
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6851
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1065 before and 0.0616 after correction. The Ratio of minimum to maximum transmission is 0.9182. The λ/2 correction factor is Not present.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.187
_exptl_crystal_description       Plate
_exptl_crystal_F_000             420
_exptl_crystal_size_max          0.214
_exptl_crystal_size_mid          0.115
_exptl_crystal_size_min          0.033
_refine_diff_density_max         0.243
_refine_diff_density_min         -0.301
_refine_diff_density_rms         0.056
_refine_ls_abs_structure_details
;
 Flack x determined using 2524 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.00(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.084
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     241
_refine_ls_number_reflns         6709
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.084
_refine_ls_R_factor_all          0.0468
_refine_ls_R_factor_gt           0.0320
_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/[σ²(Fo²)+(0.0264P)²+0.2783P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0652
_refine_ls_wR_factor_ref         0.0739
_reflns_Friedel_coverage         0.905
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.987
_reflns_number_gt                5890
_reflns_number_total             6709
_reflns_threshold_expression     'I > 2σ(I)'
_cod_data_source_file            d6dt00083e3.cif
_cod_data_source_block           rk13_1
_cod_original_cell_volume        1104.07(6)
_cod_database_code               7720594
_shelx_shelxl_version_number     2018/3
_shelx_space_group_comment
;
The symmetry employed for this shelxl refinement is uniquely defined
by the following loop, which should always be used as a source of
symmetry information in preference to the above space-group names.
They are only intended as comments.
;
_shelx_estimated_absorpt_t_max   0.992
_shelx_estimated_absorpt_t_min   0.950
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C3(H3), C7(H7), C8(H8), C9(H9), C10(H10), C12(H12), C13(H13), C14(H14),
 C15(H15)
2.b Idealised Me refined as rotating group:
 C16(H16A,H16B,H16C), C17(H17A,H17B,H17C), C18(H18A,H18B,H18C), C19(H19A,H19B,
 H19C), C20(H20A,H20B,H20C), C21(H21A,H21B,H21C)
;
_olex2_submission_special_instructions 'No special instructions were received'
loop_
_space_group_symop_operation_xyz
'x, y, z'
'-x, y+1/2, -z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
_atom_site_site_symmetry_order
_atom_site_calc_flag
_atom_site_refinement_flags_posn
_atom_site_refinement_flags_adp
_atom_site_refinement_flags_occupancy
_atom_site_disorder_assembly
_atom_site_disorder_group
P1 P 0.61157(6) 0.42190(5) 0.62629(6) 0.01482(12) Uani 1 1 d . . . . .
Si1 Si 0.82640(6) 0.45192(5) 0.90367(6) 0.01700(13) Uani 1 1 d . . . . .
Si2 Si 0.37293(6) 0.38763(5) 0.36695(6) 0.01442(13) Uani 1 1 d . . . . .
N1 N 0.6973(2) 0.68701(17) 0.9782(2) 0.0217(4) Uani 1 1 d . . . . .
N2 N 0.11398(18) 0.44416(16) 0.54210(19) 0.0169(4) Uani 1 1 d . . . . .
C1 C 0.6453(2) 0.48784(18) 0.7877(2) 0.0147(4) Uani 1 1 d . . . . .
C2 C 0.5432(2) 0.55756(19) 0.8263(2) 0.0151(4) Uani 1 1 d . . . . .
C3 C 0.4046(2) 0.56913(19) 0.7450(2) 0.0160(4) Uani 1 1 d . . . . .
H3 H 0.341177 0.615318 0.780848 0.019 Uiso 1 1 calc R U . . .
C4 C 0.3518(2) 0.51849(18) 0.6156(2) 0.0142(4) Uani 1 1 d . . . . .
C5 C 0.4359(2) 0.45407(19) 0.5457(2) 0.0142(4) Uani 1 1 d . . . . .
C6 C 0.5778(2) 0.62515(18) 0.9576(2) 0.0157(4) Uani 1 1 d . . . . .
C7 C 0.4895(3) 0.6249(2) 1.0517(2) 0.0202(5) Uani 1 1 d . . . . .
H7 H 0.405384 0.580826 1.034024 0.024 Uiso 1 1 calc R U . . .
C8 C 0.5263(3) 0.6900(2) 1.1716(3) 0.0238(5) Uani 1 1 d . . . . .
H8 H 0.468291 0.690128 1.237697 0.029 Uiso 1 1 calc R U . . .
C9 C 0.6484(3) 0.7546(2) 1.1935(3) 0.0232(5) Uani 1 1 d . . . . .
H9 H 0.675909 0.800634 1.274010 0.028 Uiso 1 1 calc R U . . .
C10 C 0.7292(3) 0.7498(2) 1.0938(3) 0.0251(5) Uani 1 1 d . . . . .
H10 H 0.813039 0.794144 1.108669 0.030 Uiso 1 1 calc R U . . .
C11 C 0.1962(2) 0.53566(18) 0.5528(2) 0.0147(4) Uani 1 1 d . . . . .
C12 C 0.1429(2) 0.6415(2) 0.5106(2) 0.0183(4) Uani 1 1 d . . . . .
H12 H 0.204610 0.704430 0.520301 0.022 Uiso 1 1 calc R U . . .
C13 C -0.0020(2) 0.6538(2) 0.4539(2) 0.0197(4) Uani 1 1 d . . . . .
H13 H -0.041018 0.724920 0.423175 0.024 Uiso 1 1 calc R U . . .
C14 C -0.0881(2) 0.5602(2) 0.4432(2) 0.0181(4) Uani 1 1 d . . . . .
H14 H -0.187755 0.565675 0.406042 0.022 Uiso 1 1 calc R U . . .
C15 C -0.0257(2) 0.4584(2) 0.4878(2) 0.0194(4) Uani 1 1 d . . . . .
H15 H -0.085489 0.394412 0.479565 0.023 Uiso 1 1 calc R U . . .
C16 C 0.8708(3) 0.3068(2) 0.8534(3) 0.0285(6) Uani 1 1 d . . . . .
H16A H 0.955869 0.279901 0.919948 0.043 Uiso 1 1 calc R U . . .
H16B H 0.888936 0.308195 0.759347 0.043 Uiso 1 1 calc R U . . .
H16C H 0.790882 0.256555 0.854678 0.043 Uiso 1 1 calc R U . . .
C17 C 0.9682(2) 0.5494(2) 0.8748(3) 0.0256(5) Uani 1 1 d . . . . .
H17A H 0.974257 0.545806 0.776758 0.038 Uiso 1 1 calc R U . . .
H17B H 1.059695 0.527447 0.934854 0.038 Uiso 1 1 calc R U . . .
H17C H 0.944974 0.626003 0.897523 0.038 Uiso 1 1 calc R U . . .
C18 C 0.8188(3) 0.4413(3) 1.0914(2) 0.0298(6) Uani 1 1 d . . . . .
H18A H 0.820377 0.516569 1.131411 0.045 Uiso 1 1 calc R U . . .
H18B H 0.901018 0.398666 1.142670 0.045 Uiso 1 1 calc R U . . .
H18C H 0.730992 0.402984 1.098692 0.045 Uiso 1 1 calc R U . . .
C19 C 0.5307(2) 0.3762(2) 0.2866(2) 0.0194(4) Uani 1 1 d . . . . .
H19A H 0.574248 0.450151 0.285099 0.029 Uiso 1 1 calc R U . . .
H19B H 0.500041 0.347810 0.190962 0.029 Uiso 1 1 calc R U . . .
H19C H 0.600338 0.324510 0.341821 0.029 Uiso 1 1 calc R U . . .
C20 C 0.3016(3) 0.2459(2) 0.3881(3) 0.0249(5) Uani 1 1 d . . . . .
H20A H 0.376161 0.199999 0.446542 0.037 Uiso 1 1 calc R U . . .
H20B H 0.270057 0.210637 0.296192 0.037 Uiso 1 1 calc R U . . .
H20C H 0.220868 0.252149 0.432560 0.037 Uiso 1 1 calc R U . . .
C21 C 0.2366(2) 0.4739(2) 0.2455(2) 0.0222(5) Uani 1 1 d . . . . .
H21A H 0.146973 0.472222 0.276318 0.033 Uiso 1 1 calc R U . . .
H21B H 0.221201 0.443338 0.150787 0.033 Uiso 1 1 calc R U . . .
H21C H 0.270158 0.551403 0.245864 0.033 Uiso 1 1 calc R U . . .
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
P P 0.1023 0.0942 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_3
_geom_angle_publ_flag
C1 P1 C5 106.03(10) . . ?
C16 Si1 C1 106.47(11) . . ?
C17 Si1 C1 111.90(11) . . ?
C17 Si1 C16 108.38(13) . . ?
C17 Si1 C18 112.85(12) . . ?
C18 Si1 C1 111.66(10) . . ?
C18 Si1 C16 105.08(14) . . ?
C19 Si2 C5 107.54(10) . . ?
C20 Si2 C5 109.04(11) . . ?
C20 Si2 C19 109.78(12) . . ?
C20 Si2 C21 110.38(12) . . ?
C21 Si2 C5 113.02(11) . . ?
C21 Si2 C19 107.00(11) . . ?
C10 N1 C6 117.3(2) . . ?
C11 N2 C15 116.8(2) . . ?
P1 C1 Si1 113.62(12) . . ?
C2 C1 P1 121.24(16) . . ?
C2 C1 Si1 125.11(16) . . ?
C1 C2 C6 121.35(19) . . ?
C3 C2 C1 122.8(2) . . ?
C3 C2 C6 115.89(19) . . ?
C2 C3 H3 117.2 . . ?
C4 C3 C2 125.5(2) . . ?
C4 C3 H3 117.2 . . ?
C3 C4 C5 123.39(19) . . ?
C3 C4 C11 116.02(19) . . ?
C5 C4 C11 120.59(18) . . ?
P1 C5 Si2 113.71(11) . . ?
C4 C5 P1 120.60(15) . . ?
C4 C5 Si2 125.59(15) . . ?
N1 C6 C2 116.17(19) . . ?
N1 C6 C7 122.4(2) . . ?
C7 C6 C2 121.5(2) . . ?
C6 C7 H7 120.5 . . ?
C8 C7 C6 119.1(2) . . ?
C8 C7 H7 120.5 . . ?
C7 C8 H8 120.4 . . ?
C9 C8 C7 119.2(2) . . ?
C9 C8 H8 120.4 . . ?
C8 C9 H9 121.2 . . ?
C8 C9 C10 117.6(2) . . ?
C10 C9 H9 121.2 . . ?
N1 C10 C9 124.5(2) . . ?
N1 C10 H10 117.7 . . ?
C9 C10 H10 117.7 . . ?
N2 C11 C4 116.09(19) . . ?
N2 C11 C12 123.00(19) . . ?
C12 C11 C4 120.91(19) . . ?
C11 C12 H12 120.5 . . ?
C13 C12 C11 119.0(2) . . ?
C13 C12 H12 120.5 . . ?
C12 C13 H13 120.7 . . ?
C14 C13 C12 118.6(2) . . ?
C14 C13 H13 120.7 . . ?
C13 C14 H14 120.8 . . ?
C13 C14 C15 118.4(2) . . ?
C15 C14 H14 120.8 . . ?
N2 C15 C14 124.3(2) . . ?
N2 C15 H15 117.9 . . ?
C14 C15 H15 117.9 . . ?
Si1 C16 H16A 109.5 . . ?
Si1 C16 H16B 109.5 . . ?
Si1 C16 H16C 109.5 . . ?
H16A C16 H16B 109.5 . . ?
H16A C16 H16C 109.5 . . ?
H16B C16 H16C 109.5 . . ?
Si1 C17 H17A 109.5 . . ?
Si1 C17 H17B 109.5 . . ?
Si1 C17 H17C 109.5 . . ?
H17A C17 H17B 109.5 . . ?
H17A C17 H17C 109.5 . . ?
H17B C17 H17C 109.5 . . ?
Si1 C18 H18A 109.5 . . ?
Si1 C18 H18B 109.5 . . ?
Si1 C18 H18C 109.5 . . ?
H18A C18 H18B 109.5 . . ?
H18A C18 H18C 109.5 . . ?
H18B C18 H18C 109.5 . . ?
Si2 C19 H19A 109.5 . . ?
Si2 C19 H19B 109.5 . . ?
Si2 C19 H19C 109.5 . . ?
H19A C19 H19B 109.5 . . ?
H19A C19 H19C 109.5 . . ?
H19B C19 H19C 109.5 . . ?
Si2 C20 H20A 109.5 . . ?
Si2 C20 H20B 109.5 . . ?
Si2 C20 H20C 109.5 . . ?
H20A C20 H20B 109.5 . . ?
H20A C20 H20C 109.5 . . ?
H20B C20 H20C 109.5 . . ?
Si2 C21 H21A 109.5 . . ?
Si2 C21 H21B 109.5 . . ?
Si2 C21 H21C 109.5 . . ?
H21A C21 H21B 109.5 . . ?
H21A C21 H21C 109.5 . . ?
H21B C21 H21C 109.5 . . ?
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
_geom_bond_publ_flag
P1 C1 1.735(2) . ?
P1 C5 1.743(2) . ?
Si1 C1 1.906(2) . ?
Si1 C16 1.878(3) . ?
Si1 C17 1.867(3) . ?
Si1 C18 1.869(2) . ?
Si2 C5 1.898(2) . ?
Si2 C19 1.874(2) . ?
Si2 C20 1.857(3) . ?
Si2 C21 1.872(2) . ?
N1 C6 1.346(3) . ?
N1 C10 1.338(3) . ?
N2 C11 1.341(3) . ?
N2 C15 1.343(3) . ?
C1 C2 1.407(3) . ?
C2 C3 1.401(3) . ?
C2 C6 1.495(3) . ?
C3 H3 0.9500 . ?
C3 C4 1.396(3) . ?
C4 C5 1.407(3) . ?
C4 C11 1.502(3) . ?
C6 C7 1.394(3) . ?
C7 H7 0.9500 . ?
C7 C8 1.389(3) . ?
C8 H8 0.9500 . ?
C8 C9 1.385(4) . ?
C9 H9 0.9500 . ?
C9 C10 1.387(4) . ?
C10 H10 0.9500 . ?
C11 C12 1.392(3) . ?
C12 H12 0.9500 . ?
C12 C13 1.391(3) . ?
C13 H13 0.9500 . ?
C13 C14 1.382(3) . ?
C14 H14 0.9500 . ?
C14 C15 1.383(3) . ?
C15 H15 0.9500 . ?
C16 H16A 0.9800 . ?
C16 H16B 0.9800 . ?
C16 H16C 0.9800 . ?
C17 H17A 0.9800 . ?
C17 H17B 0.9800 . ?
C17 H17C 0.9800 . ?
C18 H18A 0.9800 . ?
C18 H18B 0.9800 . ?
C18 H18C 0.9800 . ?
C19 H19A 0.9800 . ?
C19 H19B 0.9800 . ?
C19 H19C 0.9800 . ?
C20 H20A 0.9800 . ?
C20 H20B 0.9800 . ?
C20 H20C 0.9800 . ?
C21 H21A 0.9800 . ?
C21 H21B 0.9800 . ?
C21 H21C 0.9800 . ?
loop_
_geom_torsion_atom_site_label_1
_geom_torsion_atom_site_label_2
_geom_torsion_atom_site_label_3
_geom_torsion_atom_site_label_4
_geom_torsion
_geom_torsion_site_symmetry_1
_geom_torsion_site_symmetry_2
_geom_torsion_site_symmetry_3
_geom_torsion_site_symmetry_4
_geom_torsion_publ_flag
P1 C1 C2 C3 6.7(3) . . . . ?
P1 C1 C2 C6 -172.62(16) . . . . ?
Si1 C1 C2 C3 -170.99(17) . . . . ?
Si1 C1 C2 C6 9.6(3) . . . . ?
N1 C6 C7 C8 -0.5(4) . . . . ?
N2 C11 C12 C13 -0.3(3) . . . . ?
C1 P1 C5 Si2 -178.74(11) . . . . ?
C1 P1 C5 C4 -2.1(2) . . . . ?
C1 C2 C3 C4 -2.8(4) . . . . ?
C1 C2 C6 N1 49.9(3) . . . . ?
C1 C2 C6 C7 -131.1(2) . . . . ?
C2 C3 C4 C5 -4.3(4) . . . . ?
C2 C3 C4 C11 175.3(2) . . . . ?
C2 C6 C7 C8 -179.5(2) . . . . ?
C3 C2 C6 N1 -129.5(2) . . . . ?
C3 C2 C6 C7 49.5(3) . . . . ?
C3 C4 C5 P1 6.3(3) . . . . ?
C3 C4 C5 Si2 -177.53(17) . . . . ?
C3 C4 C11 N2 -113.2(2) . . . . ?
C3 C4 C11 C12 66.0(3) . . . . ?
C4 C11 C12 C13 -179.5(2) . . . . ?
C5 P1 C1 Si1 173.92(11) . . . . ?
C5 P1 C1 C2 -4.1(2) . . . . ?
C5 C4 C11 N2 66.4(3) . . . . ?
C5 C4 C11 C12 -114.4(2) . . . . ?
C6 N1 C10 C9 0.5(4) . . . . ?
C6 C2 C3 C4 176.6(2) . . . . ?
C6 C7 C8 C9 0.9(4) . . . . ?
C7 C8 C9 C10 -0.7(4) . . . . ?
C8 C9 C10 N1 -0.1(4) . . . . ?
C10 N1 C6 C2 178.8(2) . . . . ?
C10 N1 C6 C7 -0.2(3) . . . . ?
C11 N2 C15 C14 0.0(3) . . . . ?
C11 C4 C5 P1 -173.27(16) . . . . ?
C11 C4 C5 Si2 2.9(3) . . . . ?
C11 C12 C13 C14 0.8(3) . . . . ?
C12 C13 C14 C15 -0.8(3) . . . . ?
C13 C14 C15 N2 0.4(4) . . . . ?
C15 N2 C11 C4 179.16(19) . . . . ?
C15 N2 C11 C12 -0.1(3) . . . . ?
C19 Si2 C5 P1 -31.34(15) . . . . ?
C19 Si2 C5 C4 152.25(19) . . . . ?
C20 Si2 C5 P1 87.65(14) . . . . ?
C20 Si2 C5 C4 -88.8(2) . . . . ?
C21 Si2 C5 P1 -149.20(12) . . . . ?
C21 Si2 C5 C4 34.4(2) . . . . ?
