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#$Date: 2021-10-18 12:56:09 +0300 (Mon, 18 Oct 2021) $
#$Revision: 270009 $
#$URL: file:///home/coder/svn-repositories/cod/cif/1/56/49/1564988.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_1564988
loop_
_publ_author_name
'Lozan, Vasile'
'Makhloufi, Gamall'
'Druta, Vadim'
'Bourosh, Paulina'
'Kravtsov, Victor Ch.'
'Marangoci, Narcisa'
'Heering, Christian'
'Janiak, Christoph'
_publ_section_title
;
 Synthesis and structure of zinc(II) and cobalt(II) coordination polymers
 involving the elongated 2′,3′,5′,6′
 tetramethylterphenyl-4, 4″-dicarboxylate ligand
;
_journal_name_full               'Inorganica Chimica Acta'
_journal_page_first              119500
_journal_paper_doi               10.1016/j.ica.2020.119500
_journal_volume                  506
_journal_year                    2020
_chemical_formula_moiety         '2(C29 H31 N O5 Zn), 2(C5 H11 N O)'
_chemical_formula_sum            'C68 H84 N4 O12 Zn2'
_chemical_formula_weight         1280.13
_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'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 108.323(6)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   19.7632(13)
_cell_length_b                   19.5104(9)
_cell_length_c                   18.4626(10)
_cell_measurement_reflns_used    1802
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.0380
_cell_measurement_theta_min      2.9672
_cell_volume                     6758.0(7)
_computing_cell_refinement       'CrysAlisPro, Agilent Technologies'
_computing_data_collection       'CrysAlisPro, Agilent Technologie'
_computing_data_reduction        'CrysAlisPro, Agilent Technologies'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 15.9914
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Xcalibur, Eos'
_diffrn_measurement_method       'ω scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0442
_diffrn_reflns_av_unetI/netI     0.0843
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            11350
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.049
_diffrn_reflns_theta_max         25.049
_diffrn_reflns_theta_min         2.973
_diffrn_source                   'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.771
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.94581
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   CrysAlis
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.258
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             2704
_exptl_crystal_size_max          0.430
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.080
_refine_diff_density_max         0.711
_refine_diff_density_min         -0.536
_refine_diff_density_rms         0.082
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     401
_refine_ls_number_reflns         5974
_refine_ls_number_restraints     60
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.1048
_refine_ls_R_factor_gt           0.0662
_refine_ls_shift/su_max          0.061
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[σ²(Fo²)+(0.1050P)²+6.0796P] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1656
_refine_ls_wR_factor_ref         0.1930
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                4062
_reflns_number_total             5974
_reflns_threshold_expression     'I > 2σ(I)'
_cod_data_source_file            comp3_pb_2496_Druta.cif
_cod_data_source_block           pb_2496_Druta
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               1564988
_shelx_shelxl_version_number     2014/7
_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_min   0.733
_shelx_estimated_absorpt_t_max   0.941
loop_
_space_group_symop_operation_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_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
Zn1 Zn 0.48963(3) 0.10551(3) 0.32568(3) 0.0241(2) Uani 1 1 d . . . . .
O1A O 0.38591(18) 0.1000(2) 0.2543(2) 0.0481(10) Uani 1 1 d . . . . .
O2A O 0.40260(18) 0.10586(19) 0.1396(2) 0.0443(9) Uani 1 1 d . . . . .
C1A C 0.3643(3) 0.0976(2) 0.1824(3) 0.0361(12) Uani 1 1 d . . . . .
C2A C 0.2871(3) 0.0827(3) 0.1438(3) 0.0372(12) Uani 1 1 d . . . . .
C3A C 0.2423(3) 0.0660(4) 0.1853(3) 0.0596(18) Uani 1 1 d . . . . .
H19 H 0.2596 0.0670 0.2383 0.071 Uiso 1 1 calc R U . . .
C4A C 0.1727(3) 0.0479(4) 0.1497(3) 0.067(2) Uani 1 1 d . . . . .
H20 H 0.1439 0.0363 0.1792 0.080 Uiso 1 1 calc R U . . .
C5A C 0.1446(3) 0.0465(3) 0.0718(3) 0.0407(13) Uani 1 1 d . . . . .
C6A C 0.1885(3) 0.0654(3) 0.0302(3) 0.0459(15) Uani 1 1 d . . . . .
H22 H 0.1706 0.0657 -0.0228 0.055 Uiso 1 1 calc R U . . .
C7A C 0.2579(3) 0.0837(3) 0.0654(3) 0.0457(15) Uani 1 1 d . . . . .
H23 H 0.2861 0.0971 0.0359 0.055 Uiso 1 1 calc R U . . .
C8A C 0.0694(3) 0.0227(3) 0.0338(3) 0.0373(13) Uani 1 1 d . . . . .
C9A C 0.0129(3) 0.0682(3) 0.0231(3) 0.0382(13) Uani 1 1 d . . . . .
C10A C 0.0566(3) -0.0459(3) 0.0109(3) 0.0367(13) Uani 1 1 d . . . . .
C11A C 0.0276(3) 0.1426(3) 0.0484(4) 0.0636(18) Uani 1 1 d . . . . .
H26A H 0.0039 0.1724 0.0068 0.095 Uiso 1 1 calc R U . . .
H26B H 0.0780 0.1509 0.0636 0.095 Uiso 1 1 calc R U . . .
H26C H 0.0104 0.1512 0.0906 0.095 Uiso 1 1 calc R U . . .
C12A C 0.1183(3) -0.0960(3) 0.0249(4) 0.0599(17) Uani 1 1 d . . . . .
H28A H 0.1625 -0.0718 0.0453 0.090 Uiso 1 1 calc R U . . .
H28B H 0.1169 -0.1175 -0.0223 0.090 Uiso 1 1 calc R U . . .
H28C H 0.1144 -0.1304 0.0606 0.090 Uiso 1 1 calc R U . . .
O1B O 0.48793(19) 0.20710(17) 0.3051(2) 0.0422(9) Uani 1 1 d . . . . .
O2B O 0.5057(2) 1.00312(18) 0.1919(2) 0.0528(11) Uani 1 1 d . . . . .
C1B C 0.5000 0.2362(3) 0.2500 0.0331(17) Uani 1 2 d S T P . .
C2B C 0.5000 0.3138(4) 0.2500 0.0333(16) Uani 1 2 d S T P . .
C3B C 0.4907(3) 0.3497(3) 0.3106(3) 0.0429(14) Uani 1 1 d . . . . .
H3 H 0.4844 0.3262 0.3518 0.051 Uiso 1 1 calc R U . . .
C4B C 0.4908(3) 0.4206(3) 0.3104(3) 0.0434(15) Uani 1 1 d . . . . .
H4 H 0.4845 0.4442 0.3515 0.052 Uiso 1 1 calc R U . . .
C5B C 0.5000 0.4568(3) 0.2500 0.0372(18) Uani 1 2 d S T P . .
C6B C 0.5000 0.5328(3) 0.2500 0.0332(17) Uani 1 2 d S T P . .
C7B C 0.5628(3) 0.5691(3) 0.2871(3) 0.0349(12) Uani 1 1 d . . . . .
C8B C 0.5634(3) 0.6412(3) 0.2860(3) 0.0403(13) Uani 1 1 d . . . . .
C9B C 0.5000 0.6765(3) 0.2500 0.0344(17) Uani 1 2 d S T P . .
C10B C 0.6305(3) 0.5299(3) 0.3292(3) 0.0473(14) Uani 1 1 d . . . . .
H8A H 0.6696 0.5472 0.3143 0.071 Uiso 1 1 calc R U . . .
H8B H 0.6239 0.4821 0.3166 0.071 Uiso 1 1 calc R U . . .
H8C H 0.6406 0.5356 0.3833 0.071 Uiso 1 1 calc R U . . .
C11B C 0.6322(3) 0.6794(3) 0.3208(4) 0.0574(16) Uani 1 1 d . . . . .
H10A H 0.6492 0.6712 0.3748 0.086 Uiso 1 1 calc R U . . .
H10B H 0.6242 0.7276 0.3116 0.086 Uiso 1 1 calc R U . . .
H10C H 0.6671 0.6639 0.2983 0.086 Uiso 1 1 calc R U . . .
C12B C 0.5000 0.7530(3) 0.2500 0.0379(18) Uani 1 2 d S T P . .
C13B C 0.4900(3) 0.7899(3) 0.3099(3) 0.0527(17) Uani 1 1 d . . . . .
H13 H 0.4833 0.7665 0.3510 0.063 Uiso 1 1 calc R U . . .
C14B C 0.4898(3) 0.8609(3) 0.3100(3) 0.0493(15) Uani 1 1 d . . . . .
H14 H 0.4827 0.8845 0.3508 0.059 Uiso 1 1 calc R U . . .
C15B C 0.5000 0.8966(4) 0.2500 0.0403(18) Uani 1 2 d S T P . .
C16B C 0.5000 0.9739(4) 0.2500 0.0368(18) Uani 1 2 d S T P . .
O1C O 0.4678(2) 0.10071(19) 0.42310(19) 0.0420(9) Uani 1 1 d . . . . .
N1C N 0.3790(3) 0.0976(3) 0.4745(3) 0.0712(18) Uani 1 1 d . . . . .
C1C C 0.4151(4) 0.1269(3) 0.4339(3) 0.0566(17) Uani 1 1 d . . . . .
H29 H 0.4000 0.1695 0.4122 0.068 Uiso 1 1 calc R U . . .
C2C C 0.3101(4) 0.1259(5) 0.4786(5) 0.092(3) Uani 1 1 d . . . . .
H30A H 0.2926 0.1602 0.4391 0.110 Uiso 1 1 calc R U . . .
H30B H 0.2750 0.0894 0.4694 0.110 Uiso 1 1 calc R U . . .
C3C C 0.3179(7) 0.1555(8) 0.5499(7) 0.188(7) Uani 1 1 d . . . . .
H31A H 0.3328 0.1212 0.5889 0.282 Uiso 1 1 calc R U . . .
H31B H 0.2731 0.1745 0.5501 0.282 Uiso 1 1 calc R U . . .
H31C H 0.3530 0.1912 0.5595 0.282 Uiso 1 1 calc R U . . .
C4C C 0.3989(4) 0.0290(4) 0.5053(4) 0.071(2) Uani 1 1 d . . . . .
H32A H 0.3801 0.0212 0.5472 0.085 Uiso 1 1 calc R U . . .
H32B H 0.4505 0.0258 0.5251 0.085 Uiso 1 1 calc R U . . .
C5C C 0.3709(5) -0.0256(4) 0.4451(5) 0.095(3) Uani 1 1 d . . . . .
H33A H 0.3202 -0.0206 0.4230 0.143 Uiso 1 1 calc R U . . .
H33B H 0.3815 -0.0701 0.4680 0.143 Uiso 1 1 calc R U . . .
H33C H 0.3931 -0.0207 0.4060 0.143 Uiso 1 1 calc R U . . .
O1D O 0.8137(4) 0.7621(3) 0.3545(4) 0.123(2) Uani 1 1 d D U . . .
N1D N 0.7799(4) 0.7972(4) 0.2295(4) 0.108(2) Uani 1 1 d D U . . .
C1D C 0.8110(5) 0.7549(4) 0.2905(5) 0.093(3) Uani 1 1 d D U . . .
H1D H 0.8326 0.7156 0.2797 0.112 Uiso 1 1 calc R U . . .
C2D C 0.7677(9) 0.8667(6) 0.2502(9) 0.212(8) Uani 1 1 d D U . . .
H2D1 H 0.8042 0.8809 0.2966 0.255 Uiso 1 1 d R U . . .
H2D2 H 0.7729 0.8942 0.2085 0.255 Uiso 1 1 d R U . . .
C3D C 0.6994(8) 0.8772(9) 0.2501(9) 0.227(9) Uani 1 1 d D U . . .
H3D1 H 0.6682 0.8450 0.2162 0.341 Uiso 1 1 calc R U . . .
H3D2 H 0.6849 0.9230 0.2332 0.341 Uiso 1 1 calc R U . . .
H3D3 H 0.6968 0.8710 0.3008 0.341 Uiso 1 1 calc R U . . .
C4D C 0.7942(10) 0.7918(11) 0.1567(7) 0.243(9) Uani 1 1 d D U . . .
H4D1 H 0.8101 0.8348 0.1413 0.292 Uiso 1 1 d R U . . .
H4D2 H 0.8291 0.7564 0.1581 0.292 Uiso 1 1 d R U . . .
C5D C 0.7293(12) 0.7749(10) 0.1058(11) 0.353(17) Uani 1 1 d D U . . .
H5D1 H 0.7119 0.7338 0.1224 0.529 Uiso 1 1 calc R U . . .
H5D2 H 0.7344 0.7674 0.0564 0.529 Uiso 1 1 calc R U . . .
H5D3 H 0.6962 0.8116 0.1029 0.529 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'
O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Zn Zn 0.2839 1.4301 '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
O1C Zn1 O1B 102.84(15) . .
O1C Zn1 O2A 102.76(15) . 2_655
O1B Zn1 O2A 90.56(15) . 2_655
O1C Zn1 O2B 97.60(16) . 2_645
O1B Zn1 O2B 159.37(16) . 2_645
O2A Zn1 O2B 87.59(16) 2_655 2_645
O1C Zn1 O1A 97.01(16) . .
O1B Zn1 O1A 88.63(15) . .
O2A Zn1 O1A 159.88(15) 2_655 .
O2B Zn1 O1A 86.15(16) 2_645 .
O1C Zn1 Zn1 174.87(11) . 2_655
O1B Zn1 Zn1 79.66(10) . 2_655
O2A Zn1 Zn1 81.59(11) 2_655 2_655
O2B Zn1 Zn1 79.75(11) 2_645 2_655
O1A Zn1 Zn1 78.49(12) . 2_655
C1A O1A Zn1 128.0(4) . .
C1A O2A Zn1 125.4(4) . 2_655
O1A C1A O2A 125.5(5) . .
O1A C1A C2A 117.9(5) . .
O2A C1A C2A 116.6(5) . .
C7A C2A C3A 117.2(5) . .
C7A C2A C1A 121.7(5) . .
C3A C2A C1A 121.1(5) . .
C4A C3A C2A 121.1(5) . .
C5A C4A C3A 121.5(5) . .
C4A C5A C6A 117.6(5) . .
C4A C5A C8A 120.7(5) . .
C6A C5A C8A 121.6(4) . .
C7A C6A C5A 121.1(5) . .
C6A C7A C2A 121.4(5) . .
C9A C8A C10A 120.4(5) . .
C9A C8A C5A 120.0(5) . .
C10A C8A C5A 119.6(5) . .
C10A C9A C8A 120.0(5) 5 .
C10A C9A C11A 120.3(5) 5 .
C8A C9A C11A 119.7(5) . .
C9A C10A C8A 119.6(5) 5 .
C9A C10A C12A 120.1(5) 5 .
C8A C10A C12A 120.2(5) . .
C1B O1B Zn1 127.1(4) . .
C16B O2B Zn1 127.3(4) . 2_665
O1B C1B O1B 126.0(6) . 2_655
O1B C1B C2B 117.0(3) . .
O1B C1B C2B 117.0(3) 2_655 .
C3B C2B C3B 119.0(6) 2_655 .
C3B C2B C1B 120.5(3) 2_655 .
C3B C2B C1B 120.5(3) . .
C2B C3B C4B 120.3(5) . .
C5B C4B C3B 121.0(5) . .
C4B C5B C4B 118.4(6) . 2_655
C4B C5B C6B 120.8(3) . .
C4B C5B C6B 120.8(3) 2_655 .
C7B C6B C7B 119.5(6) 2_655 .
C7B C6B C5B 120.2(3) 2_655 .
C7B C6B C5B 120.2(3) . .
C6B C7B C8B 120.5(5) . .
C6B C7B C10B 119.6(5) . .
C8B C7B C10B 119.9(5) . .
C9B C8B C7B 119.2(5) . .
C9B C8B C11B 120.8(5) . .
C7B C8B C11B 120.0(5) . .
C8B C9B C8B 121.2(6) . 2_655
C8B C9B C12B 119.4(3) . .
C8B C9B C12B 119.4(3) 2_655 .
C13B C12B C13B 117.4(7) 2_655 .
C13B C12B C9B 121.3(3) 2_655 .
C13B C12B C9B 121.3(3) . .
C12B C13B C14B 121.5(5) . .
C15B C14B C13B 120.3(5) . .
C14B C15B C14B 119.1(7) . 2_655
C14B C15B C16B 120.4(3) . .
C14B C15B C16B 120.4(3) 2_655 .
O2B C16B O2B 125.8(7) . 2_655
O2B C16B C15B 117.1(3) . .
O2B C16B C15B 117.1(3) 2_655 .
C1C O1C Zn1 124.3(4) . .
C1C N1C C4C 119.4(5) . .
C1C N1C C2C 122.3(6) . .
C4C N1C C2C 117.4(6) . .
O1C C1C N1C 123.3(6) . .
C3C C2C N1C 111.6(8) . .
N1C C4C C5C 111.6(6) . .
C1D N1D C2D 114.4(9) . .
C1D N1D C4D 123.0(10) . .
C2D N1D C4D 114.1(11) . .
O1D C1D N1D 128.3(9) . .
C3D C2D N1D 112.8(15) . .
C5D C4D N1D 103.9(15) . .
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
Zn1 O1C 1.979(3) .
Zn1 O1B 2.017(3) .
Zn1 O2A 2.022(3) 2_655
Zn1 O2B 2.030(4) 2_645
Zn1 O1A 2.062(3) .
Zn1 Zn1 2.9493(10) 2_655
O1A C1A 1.260(6) .
O2A C1A 1.265(6) .
O2A Zn1 2.022(3) 2_655
C1A C2A 1.495(7) .
C2A C7A 1.378(7) .
C2A C3A 1.380(7) .
C3A C4A 1.371(7) .
C4A C5A 1.369(7) .
C5A C6A 1.377(7) .
C5A C8A 1.505(7) .
C6A C7A 1.369(7) .
C8A C9A 1.392(7) .
C8A C10A 1.402(7) .
C9A C10A 1.388(7) 5
C9A C11A 1.524(8) .
C10A C9A 1.388(7) 5
C10A C12A 1.520(8) .
O1B C1B 1.252(4) .
O2B C16B 1.252(5) .
O2B Zn1 2.030(4) 2_665
C1B O1B 1.252(4) 2_655
C1B C2B 1.513(9) .
C2B C3B 1.382(6) 2_655
C2B C3B 1.382(6) .
C3B C4B 1.382(7) .
C4B C5B 1.379(6) .
C5B C4B 1.379(6) 2_655
C5B C6B 1.484(9) .
C6B C7B 1.406(6) 2_655
C6B C7B 1.406(6) .
C7B C8B 1.407(7) .
C7B C10B 1.526(7) .
C8B C9B 1.400(6) .
C8B C11B 1.506(7) .
C9B C8B 1.400(6) 2_655
C9B C12B 1.493(9) .
C12B C13B 1.385(6) 2_655
C12B C13B 1.385(6) .
C13B C14B 1.385(7) .
C14B C15B 1.377(6) .
C15B C14B 1.377(6) 2_655
C15B C16B 1.507(9) .
C16B O2B 1.252(5) 2_655
O1C C1C 1.232(7) .
N1C C1C 1.318(8) .
N1C C4C 1.458(8) .
N1C C2C 1.493(9) .
C2C C3C 1.400(12) .
C4C C5C 1.513(10) .
O1D C1D 1.174(9) .
N1D C1D 1.376(7) .
N1D C2D 1.448(8) .
N1D C4D 1.460(8) .
C2D C3D 1.365(14) .
C4D C5D 1.371(15) .
