A Quantum Spin Liquid from a Three-Dimensional Copper-Oxalate-Framework.
Zhang, Bin; Baker, Peter J.; Zhang, Yan; Wang, Dongwei; Wang, Zheming; Su, Shaokui; Zhu, Daoben; Pratt, Francis L.; Journal of the American Chemical Society  (2017) –; doi:10.1021/jacs.7b11179

data_4126855
_publ_section_title
;
 A Quantum Spin Liquid from a Three-Dimensional Copper-Oxalate-Framework.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.7b11179
_journal_year                    2017
_chemical_formula_sum            'C18 H32 Cu2 N2 O12'
_chemical_formula_weight         595.53
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 107.6690(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.72590(10)
_cell_length_b                   34.0441(4)
_cell_length_c                   8.65270(10)
_cell_measurement_reflns_used    33710
_cell_measurement_temperature    165(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      3.395
_cell_volume                     2449.16(5)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       KappaCCD
_computing_data_reduction
'Denzo and Scalepak (Otwinowski & Minor, 1997)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      165(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.982
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0365
_diffrn_reflns_av_unetI/netI     0.0273
_diffrn_reflns_Laue_measured_fraction_full 0.989
_diffrn_reflns_Laue_measured_fraction_max 0.982
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       44
_diffrn_reflns_limit_k_min       -44
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            28405
_diffrn_reflns_point_group_measured_fraction_full 0.989
_diffrn_reflns_point_group_measured_fraction_max 0.982
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.520
_diffrn_reflns_theta_min         3.414
_exptl_absorpt_coefficient_mu    1.799
_exptl_absorpt_correction_T_max  0.681
_exptl_absorpt_correction_T_min  0.588
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995)
;
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.615
_exptl_crystal_description       diamondiod
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.480
_exptl_crystal_size_mid          0.350
_exptl_crystal_size_min          0.220
_refine_diff_density_max         0.647
_refine_diff_density_min         -0.385
_refine_diff_density_rms         0.061
_refine_ls_extinction_coef       0.0025(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.071
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     328
_refine_ls_number_reflns         5546
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0391
_refine_ls_R_factor_gt           0.0306
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0335P)^2^+1.7052P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0784
_refine_ls_wR_factor_ref         0.0812
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4676
_reflns_number_total             5546
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            CCDC1019159-165K.cif
_cod_data_source_block           165K
_cod_database_code               4126855
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.479
_shelx_estimated_absorpt_t_max   0.693
_shelx_res_checksum              71289
_shelx_hkl_checksum              2375