#------------------------------------------------------------------------------
#$Date: 2021-02-15 15:03:29 +0200 (Mon, 15 Feb 2021) $
#$Revision: 261973 $
#$URL: file:///home/coder/svn-repositories/cod/cif/1/56/03/1560396.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_1560396
loop_
_publ_author_name
'Guo, Tiantian'
'Yang, Xiaowei'
'Li, Ruyan'
'Liu, Xiaoyu'
'Gao, Yanling'
'Dai, Zhihui'
'Fang, Min'
'Liu, Hong-Ke'
'Wu, Yong'
_publ_section_title
;
 Syntheses, structures and photoelectrochemical properties of three
 water-stable, visible light absorbing mental-organic frameworks based on
 tetrakis(4-carboxyphenyl)silane and 1,4-bis(pyridyl)benzene mixed ligands
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              129
_journal_page_last               138
_journal_paper_doi               10.1016/j.jssc.2017.05.011
_journal_volume                  253
_journal_year                    2017
_chemical_formula_sum            'C44 H30 N2 Ni O8 Si'
_chemical_formula_weight         801.50
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 115.044(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   20.6289(18)
_cell_length_b                   16.4621(14)
_cell_length_c                   13.0070(12)
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      25.02
_cell_measurement_theta_min      2.70
_cell_volume                     4001.8(6)
_computing_cell_refinement       'SAINT (Bruker, 2005)'
_computing_data_collection       'APEX2 (Bruker, 2005)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker Apex2 CCD'
_diffrn_measurement_method       'ω scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0522
_diffrn_reflns_av_sigmaI/netI    0.0593
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            9865
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         2.70
_exptl_absorpt_coefficient_mu    0.570
_exptl_absorpt_correction_T_max  0.8945
_exptl_absorpt_correction_T_min  0.7675
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.330
_exptl_crystal_description       block
_exptl_crystal_F_000             1656
_exptl_crystal_size_max          0.49
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.819
_refine_diff_density_min         -0.230
_refine_diff_density_rms         0.064
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.061
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     254
_refine_ls_number_reflns         3527
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0776
_refine_ls_R_factor_gt           0.0452
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[σ²(Fo²)+(0.0569P)²+5.3933P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1112
_refine_ls_wR_factor_ref         0.1351
_reflns_number_gt                2447
_reflns_number_total             3527
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1.cif
_cod_data_source_block           130627g
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the built-in table derived from the
CIF Core dictionary named 'cif_core.dic' version 2.4.5 last updated
on 2014-11-21.

Automatic conversion script
Id: cif_fix_values 8369 2020-08-20 11:38:08Z andrius 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1560396
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, y, -z+1/2'
'x+1/2, y+1/2, z'
'-x+1/2, y+1/2, -z+1/2'
'-x, -y, -z'
'x, -y, z-1/2'
'-x+1/2, -y+1/2, -z'
'x+1/2, -y+1/2, z-1/2'
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_symmetry_multiplicity
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
Ni1 Ni 0.5000 0.61720(3) 0.2500 0.0307(2) Uani 1 2 d S . .
Si1 Si 0.5000 0.95550(8) -0.2500 0.0305(3) Uani 1 2 d S . .
N1 N 0.57438(16) 0.52918(17) 0.3290(3) 0.0382(7) Uani 1 1 d . . .
O1 O 0.44305(12) 0.71126(14) 0.13522(19) 0.0337(6) Uani 1 1 d . . .
O2 O 0.53246(14) 0.64714(14) 0.1241(2) 0.0400(6) Uani 1 1 d . . .
O3 O 0.80598(14) 1.17044(18) 0.0473(2) 0.0576(8) Uani 1 1 d . . .
H3 H 0.8433 1.1962 0.0660 0.086 Uiso 1 1 calc R . .
O4 O 0.80173(18) 1.1850(2) -0.1240(3) 0.0861(12) Uani 1 1 d . . .
C1 C 0.6058(2) 0.4925(2) 0.2708(3) 0.0519(11) Uani 1 1 d . . .
H1 H 0.5975 0.5128 0.1996 0.062 Uiso 1 1 calc R . .
C2 C 0.6500(2) 0.4263(2) 0.3105(4) 0.0540(11) Uani 1 1 d . . .
H2 H 0.6705 0.4031 0.2661 0.065 Uiso 1 1 calc R . .
C3 C 0.6640(2) 0.3939(2) 0.4152(3) 0.0404(9) Uani 1 1 d . . .
C4 C 0.6323(2) 0.4338(2) 0.4758(3) 0.0494(11) Uani 1 1 d . . .
H4 H 0.6401 0.4152 0.5476 0.059 Uiso 1 1 calc R . .
C5 C 0.5894(2) 0.5003(2) 0.4313(3) 0.0458(10) Uani 1 1 d . . .
H5 H 0.5701 0.5263 0.4753 0.055 Uiso 1 1 calc R . .
C6 C 0.7090(2) 0.3205(2) 0.4592(3) 0.0409(9) Uani 1 1 d . . .
C7 C 0.7473(2) 0.3078(2) 0.5735(4) 0.0524(11) Uani 1 1 d . . .
H7 H 0.7460 0.3467 0.6243 0.063 Uiso 1 1 calc R . .
C8 C 0.7119(2) 0.2618(2) 0.3851(4) 0.0513(11) Uani 1 1 d . . .
H8 H 0.6864 0.2691 0.3072 0.062 Uiso 1 1 calc R . .
C9 C 0.48787(19) 0.7051(2) 0.0926(3) 0.0322(8) Uani 1 1 d . . .
C10 C 0.48990(19) 0.7671(2) 0.0113(3) 0.0327(8) Uani 1 1 d . . .
C11 C 0.5464(2) 0.7684(2) -0.0187(4) 0.0534(12) Uani 1 1 d . . .
H11 H 0.5828 0.7301 0.0110 0.064 Uiso 1 1 calc R . .
C12 C 0.5489(2) 0.8269(2) -0.0930(4) 0.0577(12) Uani 1 1 d . . .
H12 H 0.5872 0.8271 -0.1128 0.069 Uiso 1 1 calc R . .
C13 C 0.49567(19) 0.8854(2) -0.1392(3) 0.0337(8) Uani 1 1 d . . .
C14 C 0.4406(2) 0.8831(2) -0.1063(3) 0.0411(9) Uani 1 1 d . . .
H14 H 0.4042 0.9214 -0.1354 0.049 Uiso 1 1 calc R . .
C15 C 0.4379(2) 0.8254(2) -0.0311(3) 0.0424(9) Uani 1 1 d . . .
H15 H 0.4005 0.8262 -0.0092 0.051 Uiso 1 1 calc R . .
C16 C 0.7760(2) 1.1611(2) -0.0635(4) 0.0472(10) Uani 1 1 d . . .
C17 C 0.7076(2) 1.1143(2) -0.1055(3) 0.0391(9) Uani 1 1 d . . .
C18 C 0.6943(2) 1.0600(2) -0.0358(3) 0.0463(10) Uani 1 1 d . . .
H18 H 0.7266 1.0551 0.0399 0.056 Uiso 1 1 calc R . .
C19 C 0.6327(2) 1.0129(2) -0.0782(3) 0.0444(10) Uani 1 1 d . . .
H19 H 0.6252 0.9756 -0.0307 0.053 Uiso 1 1 calc R . .
C20 C 0.58216(19) 1.0201(2) -0.1896(3) 0.0332(8) Uani 1 1 d . . .
C21 C 0.5963(2) 1.0768(2) -0.2573(3) 0.0520(11) Uani 1 1 d . . .
H21 H 0.5630 1.0840 -0.3320 0.062 Uiso 1 1 calc R . .
C22 C 0.6581(2) 1.1224(3) -0.2166(3) 0.0554(11) Uani 1 1 d . . .
H22 H 0.6664 1.1588 -0.2643 0.066 Uiso 1 1 calc R . .
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'
O O 0.0106 0.0060 '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'
Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Ni Ni 0.3393 1.1124 '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
N1 Ni1 N1 89.66(17) 2_655 .
N1 Ni1 O2 98.09(10) 2_655 2_655
N1 Ni1 O2 101.32(11) . 2_655
N1 Ni1 O2 101.32(11) 2_655 .
N1 Ni1 O2 98.09(10) . .
O2 Ni1 O2 152.51(13) 2_655 .
N1 Ni1 O1 160.64(10) 2_655 2_655
N1 Ni1 O1 95.13(11) . 2_655
O2 Ni1 O1 62.59(9) 2_655 2_655
O2 Ni1 O1 96.57(9) . 2_655
N1 Ni1 O1 95.13(11) 2_655 .
N1 Ni1 O1 160.64(10) . .
O2 Ni1 O1 96.57(9) 2_655 .
O2 Ni1 O1 62.59(9) . .
O1 Ni1 O1 86.54(13) 2_655 .
N1 Ni1 C9 129.27(11) 2_655 2_655
N1 Ni1 C9 102.19(11) . 2_655
O2 Ni1 C9 31.40(10) 2_655 2_655
O2 Ni1 C9 124.80(11) . 2_655
O1 Ni1 C9 31.37(10) 2_655 2_655
O1 Ni1 C9 89.26(10) . 2_655
C20 Si1 C20 110.7(2) 2_654 .
C20 Si1 C13 110.07(14) 2_654 .
C20 Si1 C13 110.86(15) . .
C20 Si1 C13 110.86(15) 2_654 2_654
C20 Si1 C13 110.07(14) . 2_654
C13 Si1 C13 104.2(2) . 2_654
C5 N1 C1 116.4(3) . .
C5 N1 Ni1 124.6(2) . .
C1 N1 Ni1 118.6(2) . .
C9 O1 Ni1 87.7(2) . .
C9 O2 Ni1 90.06(19) . .
C16 O3 H3 109.5 . .
N1 C1 C2 123.5(4) . .
N1 C1 H1 118.2 . .
C2 C1 H1 118.2 . .
C1 C2 C3 120.5(4) . .
C1 C2 H2 119.8 . .
C3 C2 H2 119.8 . .
C2 C3 C4 115.4(3) . .
C2 C3 C6 122.2(3) . .
C4 C3 C6 122.4(3) . .
C5 C4 C3 120.9(4) . .
C5 C4 H4 119.6 . .
C3 C4 H4 119.6 . .
N1 C5 C4 123.2(3) . .
N1 C5 H5 118.4 . .
C4 C5 H5 118.4 . .
C7 C6 C8 118.2(3) . .
C7 C6 C3 121.5(3) . .
C8 C6 C3 120.3(4) . .
C6 C7 C8 121.6(4) . 7_656
C6 C7 H7 119.2 . .
C8 C7 H7 119.2 7_656 .
C6 C8 C7 120.2(4) . 7_656
C6 C8 H8 119.9 . .
C7 C8 H8 119.9 7_656 .
O1 C9 O2 118.9(3) . .
O1 C9 C10 120.2(3) . .
O2 C9 C10 120.8(3) . .
C15 C10 C11 119.1(3) . .
C15 C10 C9 121.1(3) . .
C11 C10 C9 119.8(3) . .
C10 C11 C12 119.8(4) . .
C10 C11 H11 120.1 . .
C12 C11 H11 120.1 . .
C11 C12 C13 121.9(4) . .
C11 C12 H12 119.0 . .
C13 C12 H12 119.0 . .
C14 C13 C12 116.9(3) . .
C14 C13 Si1 124.8(3) . .
C12 C13 Si1 118.2(3) . .
C13 C14 C15 121.7(3) . .
C13 C14 H14 119.1 . .
C15 C14 H14 119.1 . .
C10 C15 C14 120.5(3) . .
C10 C15 H15 119.7 . .
C14 C15 H15 119.7 . .
O4 C16 O3 123.5(4) . .
O4 C16 C17 123.1(4) . .
O3 C16 C17 113.3(3) . .
C22 C17 C18 119.1(4) . .
C22 C17 C16 120.0(4) . .
C18 C17 C16 120.9(4) . .
C17 C18 C19 120.2(4) . .
C17 C18 H18 119.9 . .
C19 C18 H18 119.9 . .
C20 C19 C18 121.7(3) . .
C20 C19 H19 119.2 . .
C18 C19 H19 119.2 . .
C19 C20 C21 116.8(3) . .
C19 C20 Si1 122.6(3) . .
C21 C20 Si1 120.6(3) . .
C22 C21 C20 121.9(4) . .
C22 C21 H21 119.0 . .
C20 C21 H21 119.0 . .
C21 C22 C17 120.3(4) . .
C21 C22 H22 119.8 . .
C17 C22 H22 119.8 . .
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
Ni1 N1 2.043(3) 2_655
Ni1 N1 2.043(3) .
Ni1 O2 2.074(2) 2_655
Ni1 O2 2.074(2) .
Ni1 O1 2.126(2) 2_655
Ni1 O1 2.126(2) .
Ni1 C9 2.432(3) 2_655
Si1 C20 1.869(4) 2_654
Si1 C20 1.869(4) .
Si1 C13 1.878(3) .
Si1 C13 1.878(3) 2_654
N1 C5 1.321(4) .
N1 C1 1.332(4) .
O1 C9 1.267(4) .
O2 C9 1.267(4) .
O3 C16 1.315(5) .
O3 H3 0.8200 .
O4 C16 1.188(5) .
C1 C2 1.373(5) .
C1 H1 0.9300 .
C2 C3 1.375(5) .
C2 H2 0.9300 .
C3 C4 1.384(5) .
C3 C6 1.483(5) .
C4 C5 1.371(5) .
C4 H4 0.9300 .
C5 H5 0.9300 .
C6 C7 1.372(5) .
C6 C8 1.384(5) .
C7 C8 1.388(5) 7_656
C7 H7 0.9300 .
C8 C7 1.388(5) 7_656
C8 H8 0.9300 .
C9 C10 1.482(5) .
C10 C15 1.370(5) .
C10 C11 1.378(5) .
C11 C12 1.379(5) .
C11 H11 0.9300 .
C12 C13 1.391(5) .
C12 H12 0.9300 .
C13 C14 1.373(5) .
C14 C15 1.381(5) .
C14 H14 0.9300 .
C15 H15 0.9300 .
C16 C17 1.493(5) .
C17 C22 1.378(5) .
C17 C18 1.381(5) .
C18 C19 1.387(5) .
C18 H18 0.9300 .
C19 C20 1.386(5) .
C19 H19 0.9300 .
C20 C21 1.397(5) .
C21 C22 1.377(5) .
C21 H21 0.9300 .
C22 H22 0.9300 .
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
N1 Ni1 N1 C5 -94.2(3) 2_655 . . .
O2 Ni1 N1 C5 4.0(3) 2_655 . . .
O2 Ni1 N1 C5 164.4(3) . . . .
O1 Ni1 N1 C5 67.0(3) 2_655 . . .
O1 Ni1 N1 C5 161.1(3) . . . .
C9 Ni1 N1 C5 36.0(3) 2_655 . . .
N1 Ni1 N1 C1 79.4(3) 2_655 . . .
O2 Ni1 N1 C1 177.6(3) 2_655 . . .
O2 Ni1 N1 C1 -22.0(3) . . . .
O1 Ni1 N1 C1 -119.4(3) 2_655 . . .
O1 Ni1 N1 C1 -25.2(5) . . . .
C9 Ni1 N1 C1 -150.3(3) 2_655 . . .
N1 Ni1 O1 C9 -105.1(2) 2_655 . . .
N1 Ni1 O1 C9 -1.4(4) . . . .
O2 Ni1 O1 C9 156.15(19) 2_655 . . .
O2 Ni1 O1 C9 -4.97(18) . . . .
O1 Ni1 O1 C9 94.3(2) 2_655 . . .
C9 Ni1 O1 C9 125.55(19) 2_655 . . .
N1 Ni1 O2 C9 94.9(2) 2_655 . . .
N1 Ni1 O2 C9 -173.8(2) . . . .
O2 Ni1 O2 C9 -39.18(18) 2_655 . . .
O1 Ni1 O2 C9 -77.7(2) 2_655 . . .
O1 Ni1 O2 C9 4.96(19) . . . .
C9 Ni1 O2 C9 -62.8(3) 2_655 . . .
C5 N1 C1 C2 2.2(6) . . . .
Ni1 N1 C1 C2 -172.0(3) . . . .
N1 C1 C2 C3 0.1(7) . . . .
C1 C2 C3 C4 -1.4(6) . . . .
C1 C2 C3 C6 177.5(4) . . . .
C2 C3 C4 C5 0.6(6) . . . .
C6 C3 C4 C5 -178.3(4) . . . .
C1 N1 C5 C4 -3.0(6) . . . .
Ni1 N1 C5 C4 170.7(3) . . . .
C3 C4 C5 N1 1.7(7) . . . .
C2 C3 C6 C7 152.0(4) . . . .
C4 C3 C6 C7 -29.2(6) . . . .
C2 C3 C6 C8 -29.5(6) . . . .
C4 C3 C6 C8 149.3(4) . . . .
C8 C6 C7 C8 -0.1(7) . . . 7_656
C3 C6 C7 C8 178.5(4) . . . 7_656
C7 C6 C8 C7 0.1(7) . . . 7_656
C3 C6 C8 C7 -178.5(4) . . . 7_656
Ni1 O1 C9 O2 8.3(3) . . . .
Ni1 O1 C9 C10 -169.0(3) . . . .
Ni1 O2 C9 O1 -8.5(3) . . . .
Ni1 O2 C9 C10 168.8(3) . . . .
O1 C9 C10 C15 -9.0(5) . . . .
O2 C9 C10 C15 173.8(3) . . . .
O1 C9 C10 C11 168.3(4) . . . .
O2 C9 C10 C11 -8.9(5) . . . .
C15 C10 C11 C12 -1.7(6) . . . .
C9 C10 C11 C12 -179.0(4) . . . .
C10 C11 C12 C13 0.1(7) . . . .
C11 C12 C13 C14 0.8(6) . . . .
C11 C12 C13 Si1 -174.2(4) . . . .
C20 Si1 C13 C14 -1.0(4) 2_654 . . .
C20 Si1 C13 C14 121.8(3) . . . .
C13 Si1 C13 C14 -119.9(4) 2_654 . . .
C20 Si1 C13 C12 173.5(3) 2_654 . . .
C20 Si1 C13 C12 -63.7(4) . . . .
C13 Si1 C13 C12 54.6(3) 2_654 . . .
C12 C13 C14 C15 -0.1(6) . . . .
Si1 C13 C14 C15 174.5(3) . . . .
C11 C10 C15 C14 2.4(6) . . . .
C9 C10 C15 C14 179.6(3) . . . .
C13 C14 C15 C10 -1.5(6) . . . .
O4 C16 C17 C22 -24.7(6) . . . .
O3 C16 C17 C22 157.8(4) . . . .
O4 C16 C17 C18 152.6(4) . . . .
O3 C16 C17 C18 -24.9(5) . . . .
C22 C17 C18 C19 1.8(6) . . . .
C16 C17 C18 C19 -175.6(4) . . . .
C17 C18 C19 C20 -1.8(6) . . . .
C18 C19 C20 C21 0.3(6) . . . .
C18 C19 C20 Si1 178.4(3) . . . .
C20 Si1 C20 C19 124.4(3) 2_654 . . .
C13 Si1 C20 C19 2.0(3) . . . .
C13 Si1 C20 C19 -112.7(3) 2_654 . . .
C20 Si1 C20 C21 -57.6(3) 2_654 . . .
C13 Si1 C20 C21 180.0(3) . . . .
C13 Si1 C20 C21 65.3(3) 2_654 . . .
C19 C20 C21 C22 1.3(6) . . . .
Si1 C20 C21 C22 -176.8(3) . . . .
C20 C21 C22 C17 -1.4(7) . . . .
C18 C17 C22 C21 -0.2(6) . . . .
C16 C17 C22 C21 177.2(4) . . . .
