Vanadogermanate Cluster Anions
T. Whitfield; X. Wang; A. J. Jacobson; Inorganic Chemistry 42 (2003) 3728–3733; doi:10.1021/ic0206185

data_4313741
_publ_section_title
;
 Vanadogermanate Cluster Anions
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              3728
_journal_page_last               3733
_journal_paper_doi               10.1021/ic0206185
_journal_volume                  42
_journal_year                    2003
_chemical_formula_sum            'C2.91 H8.91 Ge0.73 N1.45 O4.64 V1.27'
_chemical_formula_weight         256.10
_chemical_name_systematic
;
  ?
;
_space_group_IT_number           134
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-P 4ac 2bc'
_symmetry_space_group_name_H-M   'P 42/n n m :2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            22
_cell_length_a                   14.9950(7)
_cell_length_b                   14.9950(7)
_cell_length_c                   18.4077(12)
_cell_measurement_temperature    293(2)
_cell_volume                     4139.0(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.960
_diffrn_measured_fraction_theta_max 0.960
_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  0.1076
_diffrn_reflns_av_sigmaI/netI    0.0633
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            24417
_diffrn_reflns_theta_full        28.44
_diffrn_reflns_theta_max         28.44
_diffrn_reflns_theta_min         1.75
_exptl_absorpt_coefficient_mu    4.457
_exptl_crystal_density_diffrn    2.260
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             2776
_refine_diff_density_max         1.400
_refine_diff_density_min         -0.709
_refine_diff_density_rms         0.156
_refine_ls_extinction_coef       0.00013(14)
_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   1.021
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     157
_refine_ls_number_reflns         2647
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.023
_refine_ls_R_factor_all          0.0911
_refine_ls_R_factor_gt           0.0493
_refine_ls_shift/su_max          0.089
_refine_ls_shift/su_mean         0.004
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0870P)^2^+4.9153P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1339
_refine_ls_wR_factor_ref         0.1504
_reflns_number_gt                1706
_reflns_number_total             2647
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic0206185_2.cif
_cod_data_source_block           134
_cod_original_sg_symbol_H-M      'P 42/n n m'
_cod_database_code               4313741