Copper-Linked Hexaniobate Lindqvist Clusters Variations on a Theme
Ranko P. Bontchev; Eugene L. Venturini; May Nyman; Inorganic Chemistry 46 (2007) 4483–4491; doi:10.1021/ic0624118

data_4307903
_publ_section_title
;
Copper-Linked Hexaniobate Lindqvist Clusters Variations on a Theme
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              4483
_journal_page_last               4491
_journal_paper_doi               10.1021/ic0624118
_journal_volume                  46
_journal_year                    2007
_chemical_formula_sum            'Cu1.75 N3.5 Nb3 O15.5 Rb0.5'
_chemical_formula_weight         729.70
_chemical_name_common            'Copper-ammonia hexaniobate'
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                86.6190(10)
_cell_angle_beta                 83.6490(10)
_cell_angle_gamma                88.0440(10)
_cell_formula_units_Z            4
_cell_length_a                   8.7520(7)
_cell_length_b                   13.0771(10)
_cell_length_c                   15.9280(13)
_cell_measurement_temperature    293(2)
_cell_volume                     1807.9(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0178
_diffrn_reflns_av_sigmaI/netI    0.0243
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            10620
_diffrn_reflns_theta_full        22.50
_diffrn_reflns_theta_max         22.50
_diffrn_reflns_theta_min         1.29
_exptl_absorpt_coefficient_mu    5.283
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    2.681
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prizm
_exptl_crystal_F_000             1363
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.826
_refine_diff_density_min         -1.169
_refine_diff_density_rms         0.137
_refine_ls_extinction_coef       0.00000(6)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.078
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     452
_refine_ls_number_reflns         4729
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.078
_refine_ls_R_factor_all          0.0288
_refine_ls_R_factor_gt           0.0265
_refine_ls_shift/su_max          3.323
_refine_ls_shift/su_mean         0.007
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0351P)^2^+10.4611P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0719
_refine_ls_wR_factor_ref         0.0739
_reflns_number_gt                4413
_reflns_number_total             4729
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic0624118-file004.cif
_cod_data_source_block           b
_cod_original_formula_sum        'Cu1.75 N3.50 Nb3 O15.50 Rb0.50'
_cod_database_code               4307903