Crystal structure of aqua(hexamethylenetetraamine)-(pyrazine-2,3-dicarboxylato)disilver(I) dihydrate, Ag2(H2O)(C6H2N2O4)(C6H12N4) · 2H2O
Guang-Yi Wang; Zhen Ma; Bing Liu; Cun-Yuan Cao; Zeitschrift für Kristallographie - New Crystal Structures 225 (2010) 771–; doi:

data_8102860
_publ_section_title
;
 Crystal structure of
 aqua(hexamethylenetetraamine)-(pyrazine-2,3-dicarboxylato)disilver(I)
 dihydrate, Ag2(H2O)(C6H2N2O4)(C6H12N4) &#x00B7; 2H2O
;
_journal_issue                   4
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              771
_journal_volume                  225
_journal_year                    2010
_chemical_formula_moiety         'C12 H14 Ag2 N6 O5, 2(O)'
_chemical_formula_sum            'C12 H20 Ag2 N6 O7'
_chemical_formula_weight         576.08
_chemical_name_systematic
;
aqua[pyrazine-2,3-dicarboxyliato-disilver(I)-hexamethylenetetraamine] 
dihydrate, C~12~H~20~Ag~2~N~6~O~7~
;
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.000(5)
_cell_angle_beta                 90.000(5)
_cell_angle_gamma                90.000(5)
_cell_formula_units_Z            4
_cell_length_a                   20.769(5)
_cell_length_b                   6.405(5)
_cell_length_c                   12.187(5)
_cell_measurement_reflns_used    3026
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      26.06
_cell_measurement_theta_min      1.96
_cell_volume                     1621.2(15)
_computing_cell_refinement       SMART
_computing_data_collection       'SMART (Bruker, 1997)'
_computing_data_reduction        'SAINT (Bruker, 1999)'
_computing_molecular_graphics    'SHELXTL-PLUS (Sheldrick, 1990)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0186
_diffrn_reflns_av_sigmaI/netI    0.0246
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            8394
_diffrn_reflns_theta_full        26.06
_diffrn_reflns_theta_max         26.06
_diffrn_reflns_theta_min         1.96
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.471
_exptl_absorpt_correction_T_max  0.72
_exptl_absorpt_correction_T_min  0.39
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    2.360
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1136
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         1.767
_refine_diff_density_min         -0.523
_refine_diff_density_rms         0.096
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.01(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     244
_refine_ls_number_reflns         3026
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0224
_refine_ls_R_factor_gt           0.0219
_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/[\s^2^(Fo^2^)+(0.0413P)^2^+0.7324P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0584
_refine_ls_wR_factor_ref         0.0588
_reflns_number_gt                2968
_reflns_number_total             3026
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            1267-3204.cff
_cod_data_source_block           bb
_cod_database_code               8102860