<i>catena</i>-Poly[[disilver(I)(<i>Ag{—</i>Ag})-bis[μ-1,1'-(butane-1,4-diyl)diimidazole-κ^2^<i>N</i>^3^:<i>N</i>^3'^]] bis(perchlorate)]: a double helix stabilized by ligand-unsupported argentophilic interactions
Yong-Fang Li; Zi-Hong Pan; Tian-Jun Lou; Acta Crystallographica Section C 63 (2007) m516–m518; doi:10.1107/S0108270107048251

data_2016278
_publ_section_title
;<i>catena</i>-Poly[[disilver(I)(<i>Ag{---</i>Ag})-bis[\m-1,1'-(butane-1,4-diyl)diimidazole-\k^2^<i>N</i>^3^:<i>N</i>^3'^]]
 bis(perchlorate)]: a double helix stabilized by ligand-unsupported
 argentophilic interactions
;
_journal_coeditor_code           LN3066
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              m516
_journal_page_last               m518
_journal_paper_doi               10.1107/S0108270107048251
_journal_volume                  63
_journal_year                    2007
_chemical_formula_iupac          '[Ag2 (C10 H14 N4)2] (Cl O4)2'
_chemical_formula_moiety         'C10 H14 Ag N4 + , Cl O4 -'
_chemical_formula_sum            'C10 H14 Ag Cl N4 O4'
_chemical_formula_weight         397.57
_chemical_name_systematic
;
catena-Poly[[disilver(I)(Ag---Ag)]-bis[\m-1,1'-(butane-1,4-diyl)diimidazole-
\k^2^<i>N</i>:<i>N</i>'] bis(perchlorate)]
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_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
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.488(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   11.090(2)
_cell_length_b                   13.293(2)
_cell_length_c                   18.989(3)
_cell_measurement_reflns_used    2054
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      21.720
_cell_measurement_theta_min      2.392
_cell_volume                     2799.2(8)
_computing_cell_refinement       'SAINT (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        'SAINT (Bruker, 2001)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2001)'
_computing_publication_material
;
SHELXTL (Sheldrick, 2001) and publCIF (Westrip, 2007)
;
_computing_structure_refinement  'SHELXTL (Sheldrick, 2001)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2001)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker SMART 1K CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_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  0.0372
_diffrn_reflns_av_sigmaI/netI    0.0424
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            7211
_diffrn_reflns_theta_full        25.25
_diffrn_reflns_theta_max         25.25
_diffrn_reflns_theta_min         2.15
_exptl_absorpt_coefficient_mu    1.649
_exptl_absorpt_correction_T_max  0.8394
_exptl_absorpt_correction_T_min  0.5584
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2002)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.887
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1584
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.781
_refine_diff_density_min         -0.418
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     183
_refine_ls_number_reflns         2520
_refine_ls_number_restraints     100
_refine_ls_restrained_S_all      1.099
_refine_ls_R_factor_all          0.0771
_refine_ls_R_factor_gt           0.0486
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0748P)^2^+3.7187P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1202
_refine_ls_wR_factor_ref         0.1410
_reflns_number_gt                1733
_reflns_number_total             2520
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ln3066.cif
_cod_data_source_block           I
_cod_original_cell_volume        2799.3(8)
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               2016278
_cod_database_fobs_code          2016278