data_2003736 _journal_name_full 'Acta Crystallographica' _journal_year 1995 _journal_volume C51 _journal_page_first 1508 _journal_page_last 1510 _publ_section_title ; Disilver cis-Butenedioate ; _chemical_formula_sum 'C4 H2 Ag2 O4' _chemical_formula_analytical '2Ag + , C4 H2 O4 2-' _chemical_formula_weight 330 _symmetry_cell_setting Monoclinic loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x+1/2, y+1/2, -z+1/2' '-x, -y, -z' 'x-1/2, -y-1/2, z-1/2' _symmetry_space_group_name_H-M 'P 21/n' _cell_length_a 5.2983(6) _cell_length_b 9.2529(8) _cell_length_c 11.261(2) _cell_angle_alpha 90.00 _cell_angle_beta 101.850(14) _cell_angle_gamma 90.00 _cell_volume 540.29(11) _cell_formula_units_Z 4 _exptl_crystal_density_diffrn 4.054 _exptl_crystal_density_meas ? _exptl_crystal_density_method ? _diffrn_radiation_type 'Mo K\a' _diffrn_radiation_wavelength 0.71060 _cell_measurement_reflns_used 28 _cell_measurement_theta_min 10.1 _cell_measurement_theta_max 12.4 _exptl_absorpt_coefficient_mu 7.179 _cell_measurement_temperature 293(2) _exptl_crystal_description 'prism' _exptl_crystal_size_max 0.070 _exptl_crystal_size_mid 0.050 _exptl_crystal_size_min 0.030 _exptl_crystal_colour 'colourless' _chemical_compound_source ? _diffrn_measurement_device 'Siemens STOE AED-4' _diffrn_measurement_method \q/2\q _exptl_absorpt_correction_type 'Integration, SHELXTL-Plus (Sheldrick, 1991)' _exptl_absorpt_correction_T_min 0.7168 _exptl_absorpt_correction_T_max 0.8596 _diffrn_reflns_number 1537 _reflns_number_total 799 _reflns_number_observed 624 _reflns_observed_criterion >2sigma(I) _diffrn_reflns_av_R_equivalents 0.0486 _diffrn_reflns_theta_max 23.49 _diffrn_reflns_limit_h_min -5 _diffrn_reflns_limit_h_max 5 _diffrn_reflns_limit_k_min 0 _diffrn_reflns_limit_k_max 10 _diffrn_reflns_limit_l_min 0 _diffrn_reflns_limit_l_max 12 _diffrn_standards_number 3 _diffrn_standards_interval_count ? _diffrn_standards_interval_time 90 _diffrn_standards_decay_% 1 _refine_ls_structure_factor_coef Fsqd _refine_ls_R_factor_obs 0.0234 _refine_ls_wR_factor_obs 0.0493 _refine_ls_wR_factor_all 0.0543 _refine_ls_goodness_of_fit_obs 1.104 _refine_ls_goodness_of_fit_all 1.055 _refine_ls_number_reflns 799 _refine_ls_number_parameters 92 _refine_ls_hydrogen_treatment noref _refine_ls_weighting_scheme 'calc w = 1/[\s^2^(Fo^2^) + (0.0189P)^2^] where P = (Fo^2^+2F~c~^2^)/3' _refine_ls_shift/esd_max 0.000 _refine_diff_density_max 1.107 _refine_diff_density_min -0.810 _refine_ls_extinction_method 'SHELXL93 (Sheldrick, 1993)' _refine_ls_extinction_coef 0.0110(6) loop_ _atom_type_symbol _atom_type_description _atom_type_scat_source _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag 'C' 'C' 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' .0033 .0016 'H' 'H' 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' .0000 .0000 'O' 'O' 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' .0106 .0060 'Ag' 'Ag' 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' -.8971 1.1015 loop_ _atom_site_label _atom_site_occupancy _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Ag1 1 0.33598(12) -0.37289(6) 0.39030(5) 0.0284(2) Ag2 1 0.00858(12) -0.17593(6) 0.50769(5) 0.0276(2) O1 1 0.5232(9) -0.1460(5) 0.4014(5) 0.0262(12) O2 1 0.1421(9) -0.0343(5) 0.3726(4) 0.0242(12) O3 1 0.4847(11) -0.1472(5) 0.1336(5) 0.0286(12) O4 1 0.8340(10) -0.0459(6) 0.0914(5) 0.0309(12) C1 1 0.3727(13) -0.0440(7) 0.3630(6) 0.018(2) C2 1 0.4821(14) 0.0843(7) 0.3081(6) 0.0179(15) H2 1 0.5163(14) 0.1691(7) 0.3613(6) 0.021 C3 1 0.6092(13) 0.0828(7) 0.2163(6) 0.020(2) H3 1 0.7312(13) 0.1622(7) 0.2151(6) 0.024 C4 1 0.6456(13) -0.0481(7) 0.1434(6) 0.018(2) loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_22 _atom_site_aniso_U_23 _atom_site_aniso_U_33 Ag1 0.0290(4) 0.0006(3) 0.0116(3) 0.0252(3) 0.0012(2) 0.0332(4) Ag2 0.0331(4) 0.0032(3) 0.0141(3) 0.0226(3) 0.0050(2) 0.0304(4) O1 0.017(3) -0.004(2) 0.003(2) 0.021(3) 0.004(2) 0.039(3) O2 0.023(3) 0.002(2) 0.010(2) 0.025(3) 0.005(2) 0.026(3) O3 0.031(3) -0.007(3) 0.019(2) 0.025(3) -0.013(2) 0.035(3) O4 0.028(3) -0.006(3) 0.013(2) 0.040(3) -0.006(2) 0.028(3) C1 0.023(4) 0.000(3) 0.005(3) 0.019(4) -0.009(3) 0.013(3) C2 0.022(4) -0.003(3) -0.001(3) 0.014(4) -0.005(3) 0.015(4) C3 0.016(3) 0.002(3) 0.006(3) 0.017(4) 0.002(3) 0.028(4) C4 0.019(4) 0.004(3) 0.002(3) 0.019(4) 0.005(3) 0.015(3)