##############################################################################
#                                                                            #
# This CIF contains the data for a data article accepted for                 #
# publication in IUCrData. It conforms to the requirements of                #
# Notes for Authors for IUCrData, and has been                               #
# peer reviewed under the auspices of IUCrData.                              #
#                                                                            #
# Full details of the Crystallographic Information File format               #
# are given in the paper "The Crystallographic Information File (CIF):       #
# a New Standard Archive File for Crystallography" by S. R. Hall, F. H.      #
# Allen and I. D. Brown [Acta Cryst. (1991), A47, 655-685].                  #
#                                                                            #
# The current version of the core CIF dictionary is obtainable from          #
# ftp://ftp.iucr.org/pub/cif_core.dic.                                       #
#                                                                            #
# Software is freely available for graphical display of the structure(s)     #
# in this CIF. For information consult the CIF software page                 #
# http://www.iucr.org/resources/cif/software.                                #
#                                                                            #
# This file may be used for bona fide research purposes within the           #
# scientific community so long as proper attribution is given to the data    # 
# article from which it was obtained.                                        #
#                                                                            #
##############################################################################
data_I
_database_code_depnum_ccdc_archive 'CCDC 1994655'
_audit_creation_method     'SHELXL-2018/3'
_chemical_name_systematic
;\
Poly[[μ₄-3,4,8,10,11,13-hexahydro-1H,6H-bis([1,4]dithiocino)\
[6,7-b:6',7'-e]pyrazine]di-μ-iodido-dicopper(I)]
;
_chemical_name_common     ?
_chemical_formula_moiety     '[Cu2 I2(C12 H16 N2 S4)]'
_chemical_formula_sum     'C12 H16 Cu2 I2 N2 S4'
_chemical_formula_iupac     '[Cu2 I2 (C12 H16 N2 S4)]'
_chemical_formula_weight     697.39
_chemical_melting_point     ?
_space_group_crystal_system     monoclinic
_space_group_name_H-M_alt     'P 21/c'
_space_group_name_Hall     '-P 2ybc'
loop_
    _space_group_symop_operation_xyz
    'x, y, z'
    '-x, y+1/2, -z+1/2'
    '-x, -y, -z'
    'x, -y-1/2, z-1/2'
_cell_length_a     8.7612(8)
_cell_length_b     13.1852(13)
_cell_length_c     16.4458(19)
_cell_angle_alpha     90
_cell_angle_beta     94.400(9)
_cell_angle_gamma     90
_cell_volume     1894.2(3)
_cell_formula_units_Z     4
_cell_measurement_reflns_used     25
_cell_measurement_theta_min     12.60
_cell_measurement_theta_max     18.75
_cell_measurement_temperature     293(2)
_exptl_crystal_description     block
_exptl_crystal_colour     yellow
_exptl_crystal_size_max     0.420
_exptl_crystal_size_mid     0.250
_exptl_crystal_size_min     0.230
_exptl_crystal_density_diffrn     2.445
_exptl_crystal_density_meas     ?
_exptl_crystal_density_method     ?
_exptl_crystal_F_000     1320
_exptl_absorpt_coefficient_mu     5.941
_exptl_absorpt_correction_type     sphere
_exptl_absorpt_process_details
;
(ABSSphere; Spek, 2020)
;
_exptl_absorpt_correction_T_min     0.2806
_exptl_absorpt_correction_T_max     0.2947
_diffrn_ambient_temperature     293(2)
_diffrn_radiation_type     MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_source     'fine-focus sealed tube'
_diffrn_radiation_monochromator     'plane graphite'
_diffrn_measurement_device     'STOE--Siemens AED2, 4-circle'
_diffrn_measurement_method     'ω/\2q scans'
_diffrn_detector     'scintillation counter'
_diffrn_reflns_number     3481
_diffrn_reflns_av_R_equivalents     0.0000
_diffrn_reflns_av_unetI/netI     0.0249
_diffrn_reflns_theta_min     2.484
_diffrn_reflns_theta_max     25.472
_diffrn_reflns_theta_full     25.242
_diffrn_measured_fraction_theta_max     0.990
_diffrn_measured_fraction_theta_full     0.990
_diffrn_reflns_limit_h_min     -10
_diffrn_reflns_limit_h_max     10
_diffrn_reflns_limit_k_min     0
_diffrn_reflns_limit_k_max     15
_diffrn_reflns_limit_l_min     0
_diffrn_reflns_limit_l_max     19
_diffrn_standards_number     3
_diffrn_standards_interval_count     ?
_diffrn_standards_interval_time     60
_diffrn_standards_decay_%     2.5
_refine_special_details     ?
_reflns_number_total     3481
_reflns_number_gt     3032
_reflns_threshold_expression     'I > 2σ(I)'
_refine_ls_structure_factor_coef     Fsqd
_refine_ls_matrix_type     full
_refine_ls_R_factor_all     0.0450
_refine_ls_R_factor_gt     0.0359
_refine_ls_wR_factor_gt     0.0783
_refine_ls_wR_factor_ref     0.0837
_refine_ls_goodness_of_fit_ref     1.161
_refine_ls_restrained_S_all     1.161
_refine_ls_number_reflns     3481
_refine_ls_number_parameters     199
_refine_ls_number_restraints     0
_refine_ls_hydrogen_treatment     constr
_refine_ls_weighting_scheme     calc
_refine_ls_weighting_details
              'w=1/[σ²(Fo²)+(0.0312P)²+6.7359P] where P=(Fo²+2Fc²)/3'
_atom_sites_solution_hydrogens     geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary     difmap
_refine_ls_shift/su_max     0.000
_refine_ls_shift/su_mean     0.000
_refine_diff_density_max     0.705
_refine_diff_density_min     -0.688
_refine_ls_extinction_method     none
_refine_ls_extinction_coef     .
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'
    'S' 'S' 0.1246 0.1234
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'Cu' 'Cu' 0.3201 1.2651
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
    'I' 'I' -0.4742 1.8119
                         'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
_computing_data_collection
;
STADI4 (Stoe & Cie, 1998)
;
_computing_cell_refinement
;
STADI4 (Stoe & Cie, 1998)
;
_computing_data_reduction
;
X-RED (Stoe & Cie, 1998)
;
_computing_structure_solution
;
SHELXS97 (Sheldrick, 2008)
;
_computing_structure_refinement
;
SHELXL2016/6 (Sheldrick, 2015)
;
_computing_molecular_graphics
;
PLATON (Spek, 2020) and Mercury (Macrae et al.,  2020)
;
_computing_publication_material
;
SHELXL2014/6 (Sheldrick, 2015), PLATON (Spek, 2020)
and publCIF (Westrip, 2010)
;
loop_
    _atom_site_type_symbol
    _atom_site_label
    _atom_site_fract_x
    _atom_site_fract_y
    _atom_site_fract_z
    _atom_site_U_iso_or_equiv
    _atom_site_adp_type
    _atom_site_calc_flag
    _atom_site_occupancy
    _atom_site_disorder_assembly
    _atom_site_disorder_group
    Cu Cu1 0.25837(9) 0.05716(6) -0.12025(5) 0.03502(19) Uani d 1 . .
    Cu Cu2 0.12846(9) 0.24930(6) -0.12571(5) 0.03483(19) Uani d 1 . .
    I I1 0.29009(5) 0.17469(3) 0.00833(2) 0.03617(12) Uani d 1 . .
    I I2 0.04113(5) 0.10364(3) -0.22976(3) 0.03942(13) Uani d 1 . .
    S S1 0.48581(17) 0.05318(11) -0.19226(9) 0.0303(3) Uani d 1 . .
    S S2 0.34612(17) 0.32435(11) -0.16802(9) 0.0279(3) Uani d 1 . .
    S S3 -0.09175(18) 0.32212(11) -0.08436(10) 0.0321(3) Uani d 1 . .
    S S4 0.25769(18) -0.10386(11) -0.06361(10) 0.0312(3) Uani d 1 . .
    N N1 0.3515(6) -0.3124(4) -0.1619(3) 0.0293(11) Uani d 1 . .
    N N2 -0.2450(5) 0.4626(3) 0.0627(3) 0.0269(10) Uani d 1 . .
    C C1 0.5775(7) 0.0972(4) -0.3460(3) 0.0283(13) Uani d 1 . .
    C C2 0.3672(6) 0.5213(4) -0.1047(3) 0.0250(12) Uani d 1 . .
    C C3 -0.1754(6) 0.3721(4) 0.0703(3) 0.0241(12) Uani d 1 . .
    C C4 0.2279(6) -0.2971(4) -0.1210(4) 0.0285(13) Uani d 1 . .
    C C5 0.4370(7) 0.0879(5) -0.2977(4) 0.0312(13) Uani d 1 . .
    H H5A 0.368915 0.036971 -0.322989 0.037 Uiso calc 1 . .
    H H5B 0.382704 0.152044 -0.299458 0.037 Uiso calc 1 . .
    C C6 0.5233(7) -0.0809(4) -0.2035(4) 0.0304(13) Uani d 1 . .
    H H6A 0.519170 -0.113186 -0.150759 0.036 Uiso calc 1 . .
    H H6B 0.442255 -0.109868 -0.239791 0.036 Uiso calc 1 . .
    C C7 0.3230(7) 0.3938(5) -0.2633(4) 0.0295(13) Uani d 1 . .
    H H7A 0.262393 0.353567 -0.303239 0.035 Uiso calc 1 . .
    H H7B 0.267680 0.456170 -0.254845 0.035 Uiso calc 1 . .
    C C8 0.4350(6) 0.4182(4) -0.0976(4) 0.0276(12) Uani d 1 . .
    H H8A 0.427790 0.394136 -0.042326 0.033 Uiso calc 1 . .
    H H8B 0.542830 0.422877 -0.106818 0.033 Uiso calc 1 . .
    C C9 -0.0402(7) 0.3558(4) 0.0216(4) 0.0308(13) Uani d 1 . .
    H H9A 0.022699 0.302154 0.046841 0.037 Uiso calc 1 . .
    H H9B 0.020761 0.417228 0.023067 0.037 Uiso calc 1 . .
    C C10 -0.2260(7) 0.2176(5) -0.0786(4) 0.0327(13) Uani d 1 . .
    H H10A -0.315614 0.243139 -0.054062 0.039 Uiso calc 1 . .
    H H10B -0.258726 0.197287 -0.133864 0.039 Uiso calc 1 . .
    C C11 0.1717(7) -0.1229(4) 0.0318(4) 0.0290(13) Uani d 1 . .
    H H11A 0.193515 -0.064180 0.066213 0.035 Uiso calc 1 . .
    H H11B 0.061486 -0.126864 0.020645 0.035 Uiso calc 1 . .
    C C12 0.1564(7) -0.1940(4) -0.1323(4) 0.0325(13) Uani d 1 . .
    H H12A 0.049539 -0.197057 -0.120952 0.039 Uiso calc 1 . .
    H H12B 0.161706 -0.172085 -0.188363 0.039 Uiso calc 1 . .
_geom_special_details
;
 All esds (except the esd in the dihedral angle between two l.s. planes)
 are estimated using the full covariance matrix.  The cell esds are taken
 into account individually in the estimation of esds in distances, angles
 and torsion angles; correlations between esds in cell parameters are only
 used when they are defined by crystal symmetry.  An approximate (isotropic)
 treatment of cell esds is used for estimating esds involving l.s. planes.
;
loop_
    _geom_bond_atom_site_label_1
    _geom_bond_atom_site_label_2
    _geom_bond_site_symmetry_2
    _geom_bond_distance
    _geom_bond_publ_flag
    Cu1 S1 . 2.3955(16) y
    Cu1 S4 . 2.3187(16) y
    Cu1 I1 . 2.6190(9) y
    Cu1 I2 . 2.5915(10) y
    Cu1 Cu2 . 2.7759(11) y
    Cu2 S2 . 2.3030(16) y
    Cu2 S3 . 2.3039(16) y
    Cu2 I1 . 2.7117(10) y
    Cu2 I2 . 2.6460(9) y
    S1 C6 . 1.810(6) ?
    S1 C5 . 1.812(6) ?
    S2 C7 . 1.812(6) ?
    S2 C8 . 1.827(6) ?
    S3 C10 . 1.819(6) ?
    S3 C9 . 1.821(6) ?
    S4 C11 . 1.809(6) ?
    S4 C12 . 1.823(6) ?
    N1 C4 . 1.333(7) ?
    N1 C1 2_644 1.346(8) ?
    N2 C2 3_565 1.334(7) ?
    N2 C3 . 1.341(7) ?
    C1 C2 2_644 1.399(8) ?
    C1 C5 . 1.520(7) ?
    C2 C8 . 1.485(8) ?
    C3 C4 3 1.395(8) ?
    C3 C9 . 1.495(7) ?
    C4 C12 . 1.502(8) ?
    C5 H5A . 0.9700 ?
    C5 H5B . 0.9700 ?
    C6 C7 2_644 1.529(8) ?
    C6 H6A . 0.9700 ?
    C6 H6B . 0.9700 ?
    C7 H7A . 0.9700 ?
    C7 H7B . 0.9700 ?
    C8 H8A . 0.9700 ?
    C8 H8B . 0.9700 ?
    C9 H9A . 0.9700 ?
    C9 H9B . 0.9700 ?
    C10 C11 3 1.524(8) ?
    C10 H10A . 0.9700 ?
    C10 H10B . 0.9700 ?
    C11 H11A . 0.9700 ?
    C11 H11B . 0.9700 ?
    C12 H12A . 0.9700 ?
    C12 H12B . 0.9700 ?
loop_
    _geom_angle_atom_site_label_1
    _geom_angle_atom_site_label_2
    _geom_angle_atom_site_label_3
    _geom_angle_site_symmetry_1
    _geom_angle_site_symmetry_3
    _geom_angle
    _geom_angle_publ_flag
    S4 Cu1 S1 . . 101.91(6) y
    S4 Cu1 I2 . . 118.12(5) y
    S1 Cu1 I2 . . 104.83(5) y
    S4 Cu1 I1 . . 102.76(5) y
    S1 Cu1 I1 . . 111.80(5) y
    I2 Cu1 I1 . . 116.62(3) y
    S4 Cu1 Cu2 . . 146.61(5) ?
    S1 Cu1 Cu2 . . 111.01(5) ?
    I2 Cu1 Cu2 . . 58.95(3) ?
    I1 Cu1 Cu2 . . 60.27(3) ?
    S2 Cu2 S3 . . 129.92(6) y
    S2 Cu2 I2 . . 108.76(5) y
    S3 Cu2 I2 . . 106.63(5) y
    S2 Cu2 I1 . . 90.49(5) y
    S3 Cu2 I1 . . 107.95(5) y
    I2 Cu2 I1 . . 111.68(3) y
    S2 Cu2 Cu1 . . 93.15(5) ?
    S3 Cu2 Cu1 . . 136.16(5) ?
    I2 Cu2 Cu1 . . 57.04(3) ?
    I1 Cu2 Cu1 . . 57.00(2) ?
    Cu1 I1 Cu2 . . 62.73(3) ?
    Cu1 I2 Cu2 . . 64.00(3) ?
    C6 S1 C5 . . 100.4(3) ?
    C6 S1 Cu1 . . 103.67(19) ?
    C5 S1 Cu1 . . 108.86(19) ?
    C7 S2 C8 . . 102.7(3) ?
    C7 S2 Cu2 . . 116.0(2) ?
    C8 S2 Cu2 . . 114.97(19) ?
    C10 S3 C9 . . 104.4(3) ?
    C10 S3 Cu2 . . 105.0(2) ?
    C9 S3 Cu2 . . 103.4(2) ?
    C11 S4 C12 . . 103.4(3) ?
    C11 S4 Cu1 . . 119.3(2) ?
    C12 S4 Cu1 . . 111.3(2) ?
    C4 N1 C1 . 2_644 118.2(5) ?
    C2 N2 C3 3_565 . 118.1(5) ?
    N1 C1 C2 2_654 2_644 120.8(5) ?
    N1 C1 C5 2_654 . 114.1(5) ?
    C2 C1 C5 2_644 . 125.1(5) ?
    N2 C2 C1 3_565 2_654 120.9(5) ?
    N2 C2 C8 3_565 . 116.0(5) ?
    C1 C2 C8 2_654 . 123.1(5) ?
    N2 C3 C4 . 3 121.2(5) ?
    N2 C3 C9 . . 116.9(5) ?
    C4 C3 C9 3 . 121.9(5) ?
    N1 C4 C3 . 3 120.8(5) ?
    N1 C4 C12 . . 114.9(5) ?
    C3 C4 C12 3 . 124.3(5) ?
    C1 C5 S1 . . 112.3(4) ?
    C1 C5 H5A . . 109.2 ?
    S1 C5 H5A . . 109.2 ?
    C1 C5 H5B . . 109.2 ?
    S1 C5 H5B . . 109.1 ?
    H5A C5 H5B . . 107.9 ?
    C7 C6 S1 2_644 . 115.0(4) ?
    C7 C6 H6A 2_644 . 108.5 ?
    S1 C6 H6A . . 108.5 ?
    C7 C6 H6B 2_644 . 108.5 ?
    S1 C6 H6B . . 108.5 ?
    H6A C6 H6B . . 107.5 ?
    C6 C7 S2 2_654 . 112.1(4) ?
    C6 C7 H7A 2_654 . 109.2 ?
    S2 C7 H7A . . 109.2 ?
    C6 C7 H7B 2_654 . 109.2 ?
    S2 C7 H7B . . 109.2 ?
    H7A C7 H7B . . 107.9 ?
    C2 C8 S2 . . 115.0(4) ?
    C2 C8 H8A . . 108.5 ?
    S2 C8 H8A . . 108.5 ?
    C2 C8 H8B . . 108.5 ?
    S2 C8 H8B . . 108.5 ?
    H8A C8 H8B . . 107.5 ?
    C3 C9 S3 . . 113.5(4) ?
    C3 C9 H9A . . 108.9 ?
    S3 C9 H9A . . 108.9 ?
    C3 C9 H9B . . 108.9 ?
    S3 C9 H9B . . 108.9 ?
    H9A C9 H9B . . 107.7 ?
    C11 C10 S3 3 . 118.0(4) ?
    C11 C10 H10A 3 . 107.8 ?
    S3 C10 H10A . . 107.8 ?
    C11 C10 H10B 3 . 107.8 ?
    S3 C10 H10B . . 107.8 ?
    H10A C10 H10B . . 107.2 ?
    C10 C11 S4 3 . 114.7(4) ?
    C10 C11 H11A 3 . 108.6 ?
    S4 C11 H11A . . 108.6 ?
    C10 C11 H11B 3 . 108.6 ?
    S4 C11 H11B . . 108.6 ?
    H11A C11 H11B . . 107.6 ?
    C4 C12 S4 . . 109.5(4) ?
    C4 C12 H12A . . 109.8 ?
    S4 C12 H12A . . 109.8 ?
    C4 C12 H12B . . 109.8 ?
    S4 C12 H12B . . 109.8 ?
    H12A C12 H12B . . 108.2 ?
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_site_symmetry_1
    _geom_torsion_site_symmetry_2
    _geom_torsion_site_symmetry_3
    _geom_torsion_site_symmetry_4
    _geom_torsion
    _geom_torsion_publ_flag
    C2 N2 C3 C4 3_565 . . 3 -0.6(8) ?
    C2 N2 C3 C9 3_565 . . . 179.1(5) ?
    C1 N1 C4 C3 2_644 . . 3 1.2(9) ?
    C1 N1 C4 C12 2_644 . . . 179.4(5) ?
    N1 C1 C5 S1 2_654 . . . -83.4(6) ?
    C2 C1 C5 S1 2_644 . . . 96.8(7) ?
    C6 S1 C5 C1 . . . . -77.1(5) ?
    Cu1 S1 C5 C1 . . . . 174.4(4) ?
    C5 S1 C6 C7 . . . 2_644 76.2(5) ?
    Cu1 S1 C6 C7 . . . 2_644 -171.3(4) ?
    C8 S2 C7 C6 . . . 2_654 67.3(5) ?
    Cu2 S2 C7 C6 . . . 2_654 -166.5(3) ?
    N2 C2 C8 S2 3_565 . . . 85.1(6) ?
    C1 C2 C8 S2 2_654 . . . -92.7(6) ?
    C7 S2 C8 C2 . . . . 43.6(5) ?
    Cu2 S2 C8 C2 . . . . -83.2(4) ?
    N2 C3 C9 S3 . . . . -80.9(6) ?
    C4 C3 C9 S3 3 . . . 98.9(6) ?
    C10 S3 C9 C3 . . . . -50.9(5) ?
    Cu2 S3 C9 C3 . . . . -160.6(4) ?
    C9 S3 C10 C11 . . . 3 -58.6(5) ?
    Cu2 S3 C10 C11 . . . 3 49.8(5) ?
    C12 S4 C11 C10 . . . 3 77.0(5) ?
    Cu1 S4 C11 C10 . . . 3 -158.8(4) ?
    N1 C4 C12 S4 . . . . -83.0(6) ?
    C3 C4 C12 S4 3 . . . 95.2(6) ?
    C11 S4 C12 C4 . . . . -82.9(5) ?
    Cu1 S4 C12 C4 . . . . 147.8(4) ?
loop_
    _geom_hbond_atom_site_label_D
    _geom_hbond_atom_site_label_H
    _geom_hbond_atom_site_label_A
    _geom_hbond_site_symmetry_A
    _geom_hbond_distance_DH
    _geom_hbond_distance_HA
    _geom_hbond_distance_DA
    _geom_hbond_angle_DHA
    _geom_hbond_publ_flag
    C6 H6A S4 . 0.97 2.80 3.409(6) 122 yes
    C9 H9A I1 . 0.97 2.99 3.771(6) 138 yes
    C6 H6A I1 3_655 0.97 2.89 3.702(6) 142 yes
_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     0.189
_shelx_estimated_absorpt_T_max     0.342
data_Global
_journal_date_recd_electronic     2020-03-30
_journal_date_accepted     2020-04-03
_journal_name_full     'IUCrData'
_journal_year     2020
_journal_volume     5
_journal_issue      4
_journal_page_first     0
_journal_page_last     0
_journal_paper_category     HM
_journal_paper_doi     10.1107/S2414314620004678
_journal_coeditor_code     WM4128
_publ_contact_author_name     'Helen Stoeckli-Evans'
_publ_contact_author_address
;
Institute of Physics
University of Neuchâtel
rue Emile-Argand 11
CH-2000 Neuchâtel
Switzerland
;
_publ_contact_author_email     'helen.stoeckli-evans@unine.ch'
_publ_contact_author_fax     '+41 32 718 25 11'
_publ_contact_author_phone     '+41 32 718 24 26'
_publ_section_title
;\
poly[[μ₄-3,4,8,10,11,13-hexahydro-1H,6H-bis([1,4]dithiocino)\
[6,7-b:6',7'-e]pyrazine]di-μ-iodido-dicopper(I)]: a
two-dimensional copper(I) coordination polymer
;
loop_
    _publ_author_name
    _publ_author_address
    'Assoumatine, Tokouré'
;
Institute of Chemistry
University of Neuchâtel
Av. de Bellevax 51
CH-2000 Neuchâtel
Switzerland
;
    'Stoeckli-Evans, Helen'
;
Institute of Physics
University of Neuchâtel
rue Emile-Argand 11
CH-2000 Neuchâtel
Switzerland
;
_publ_section_synopsis
;\
The reaction of the pyrazinethiophane ligand
3,4,8,10,11,13-hexahydro-1H,6H-bis([1,4]dithiocino)[6,7-\
b:6',7'-e]pyrazine with CuI led to the formation of a
two-dimensional copper(I) coordination polymer with CuI in a
trigonal--pyramidal coordination environment defined by two S and two I atoms.
;
