# Supplementary Material (ESI) for ChemComm
# This journal is © The Royal Society of Chemistry 2000
# CCDC Number: 182/1671
 
data_bu5121 
 
_audit_creation_method            SHELXL 
_chemical_name_systematic 
; 
 ? 
; 
_chemical_name_common             ? 
_chemical_formula_moiety          ? 
_chemical_formula_structural      ? 
_chemical_formula_analytical      ? 
_chemical_formula_sum             'H18 As2 O35 V10' 
_chemical_formula_weight          1237.38 
_chemical_melting_point           ? 
_chemical_compound_source         ? 
 
loop_ 
 _atom_type_symbol 
 _atom_type_description 
 _atom_type_scat_dispersion_real 
 _atom_type_scat_dispersion_imag 
 _atom_type_scat_source 
 'O'  'O'   0.0106   0.0060 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 'H'  'H'   0.0000   0.0000 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 'V'  'V'   0.3005   0.5294 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 'As'  'As'   0.0499   2.0058 
 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' 
 
_symmetry_cell_setting            Cubic 
_symmetry_space_group_name_H-M    I-43m 
 
loop_ 
 _symmetry_equiv_pos_as_xyz 
 'x, y, z' 
 '-x, -y, z' 
 '-x, y, -z' 
 'x, -y, -z' 
 'z, x, y' 
 'z, -x, -y' 
 '-z, -x, y' 
 '-z, x, -y' 
 'y, z, x' 
 '-y, z, -x' 
 'y, -z, -x' 
 '-y, -z, x' 
 'y, x, z' 
 '-y, -x, z' 
 'y, -x, -z' 
 '-y, x, -z' 
 'x, z, y' 
 '-x, z, -y' 
 '-x, -z, y' 
 'x, -z, -y' 
 'z, y, x' 
 'z, -y, -x' 
 '-z, y, -x' 
 '-z, -y, x' 
 'x+1/2, y+1/2, z+1/2' 
 '-x+1/2, -y+1/2, z+1/2' 
 '-x+1/2, y+1/2, -z+1/2' 
 'x+1/2, -y+1/2, -z+1/2' 
 'z+1/2, x+1/2, y+1/2' 
 'z+1/2, -x+1/2, -y+1/2' 
 '-z+1/2, -x+1/2, y+1/2' 
 '-z+1/2, x+1/2, -y+1/2' 
 'y+1/2, z+1/2, x+1/2' 
 '-y+1/2, z+1/2, -x+1/2' 
 'y+1/2, -z+1/2, -x+1/2' 
 '-y+1/2, -z+1/2, x+1/2' 
 'y+1/2, x+1/2, z+1/2' 
 '-y+1/2, -x+1/2, z+1/2' 
 'y+1/2, -x+1/2, -z+1/2' 
 '-y+1/2, x+1/2, -z+1/2' 
 'x+1/2, z+1/2, y+1/2' 
 '-x+1/2, z+1/2, -y+1/2' 
 '-x+1/2, -z+1/2, y+1/2' 
 'x+1/2, -z+1/2, -y+1/2' 
 'z+1/2, y+1/2, x+1/2' 
 'z+1/2, -y+1/2, -x+1/2' 
 '-z+1/2, y+1/2, -x+1/2' 
 '-z+1/2, -y+1/2, x+1/2' 
 
_cell_length_a                    16.708(2) 
_cell_length_b                    16.708(2) 
_cell_length_c                    16.708(2) 
_cell_angle_alpha                 90.00 
_cell_angle_beta                  90.00 
_cell_angle_gamma                 90.00 
_cell_volume                      4664.4(9) 
_cell_formula_units_Z             4 
_cell_measurement_temperature     293(2) 
_cell_measurement_reflns_used     27 
_cell_measurement_theta_min       5.73 
_cell_measurement_theta_max       12.29 
 
_exptl_crystal_description        brick 
_exptl_crystal_colour             black 
_exptl_crystal_size_max           0.14 
_exptl_crystal_size_mid           0.13 
_exptl_crystal_size_min           0.12 
_exptl_crystal_density_meas       ? 
_exptl_crystal_density_diffrn     1.762 
_exptl_crystal_density_method     ? 
_exptl_crystal_F_000              2376 
_exptl_absorpt_coefficient_mu     3.395 
_exptl_absorpt_correction_type    'Semi-empirical from psi scan '
_exptl_absorpt_correction_T_min   ? 
_exptl_absorpt_correction_T_max   ? 
 
_exptl_special_details 
; 
 ? 
; 
 
_diffrn_ambient_temperature       293(2) 
_diffrn_radiation_wavelength      0.71073 
_diffrn_radiation_type            MoK\a 
_diffrn_radiation_source          'fine-focus sealed tube' 
_diffrn_radiation_monochromator   graphite 
_diffrn_measurement_device        'Siemens P4 '
_diffrn_measurement_method        'w scan' 
_diffrn_standards_number          3 
_diffrn_standards_interval_count  97 
_diffrn_standards_interval_time   ? 
_diffrn_standards_decay_%         ? 
_diffrn_reflns_number             2915 
_diffrn_reflns_av_R_equivalents   0.0486 
_diffrn_reflns_av_sigmaI/netI     0.0742 
_diffrn_reflns_limit_h_min        -1 
_diffrn_reflns_limit_h_max        9 
_diffrn_reflns_limit_k_min        -1 
_diffrn_reflns_limit_k_max        18 
_diffrn_reflns_limit_l_min        -18 
_diffrn_reflns_limit_l_max        18 
_diffrn_reflns_theta_min          1.72 
_diffrn_reflns_theta_max          25.06 
_reflns_number_total              633 
_reflns_number_observed           440 
_reflns_observed_criterion        >2sigma(I) 
 
_computing_data_collection        ? 
_computing_cell_refinement        ? 
_computing_data_reduction         ? 
_computing_structure_solution     'SHELXS-86 (Sheldrick, 1990)' 
_computing_structure_refinement   'SHELXL-93 (Sheldrick, 1993)' 
_computing_molecular_graphics     ? 
_computing_publication_material   ? 
 
_refine_special_details 
; 
 Refinement on F^2^ for ALL reflections except for 0 with very negative F^2^ 
 or flagged by the user for potential systematic errors.  Weighted R-factors 
 wR and all goodnesses of fit S are based on F^2^, conventional R-factors R 
 are based on F, with F set to zero for negative F^2^. The observed criterion 
 of F^2^ > 2sigma(F^2^) is used only for calculating _R_factor_obs etc. and is 
 not relevant to the choice of reflections for refinement.  R-factors based 
 on F^2^ are statistically about twice as large as those based on F, and R- 
 factors based on ALL data will be even larger. 
; 
 
_refine_ls_structure_factor_coef  Fsqd  
_refine_ls_matrix_type            full 
_refine_ls_weighting_scheme 
 'calc w=1/[\s^2^(Fo^2^)+(0.0261P)^2^] where P=(Fo^2^+2Fc^2^)/3' 
_atom_sites_solution_primary      direct 
_atom_sites_solution_secondary    difmap 
_atom_sites_solution_hydrogens    geom 
_refine_ls_hydrogen_treatment     ? 
_refine_ls_extinction_method      SHELXL 
_refine_ls_extinction_coef        0.0006(4) 
_refine_ls_extinction_expression 
 'Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^' 
_refine_ls_abs_structure_details 
 'Flack H D (1983), Acta Cryst. A39, 876-881' 
_refine_ls_abs_structure_Flack    0.54(19) 
_refine_ls_number_reflns          633 
_refine_ls_number_parameters      71 
_refine_ls_number_restraints      0 
_refine_ls_R_factor_all           0.1099 
_refine_ls_R_factor_obs           0.0569 
_refine_ls_wR_factor_all          0.1392 
_refine_ls_wR_factor_obs          0.0775 
_refine_ls_goodness_of_fit_all    1.133 
_refine_ls_goodness_of_fit_obs    1.199 
_refine_ls_restrained_S_all       1.133 
_refine_ls_restrained_S_obs       1.199 
_refine_ls_shift/esd_max          0.093 
_refine_ls_shift/esd_mean         0.013 
 
loop_ 
 _atom_site_label 
 _atom_site_type_symbol 
 _atom_site_fract_x 
 _atom_site_fract_y 
 _atom_site_fract_z 
 _atom_site_U_iso_or_equiv 
 _atom_site_thermal_displace_type 
 _atom_site_occupancy 
 _atom_site_calc_flag 
 _atom_site_refinement_flags 
 _atom_site_disorder_group 
As As 0.5000 0.0000 0.2500 0.017(2) Uani 1 d S . 
V1 V 0.3875(5) 0.0768(6) 0.3875(5) 0.020(4) Uani 1 d S . 
V2 V 0.5000 0.1473(9) 0.5000 0.022(4) Uani 1 d S . 
V3 V 0.6125(8) 0.0715(6) 0.3875(8) 0.023(7) Uani 1 d S . 
O1 O 0.3444(8) 0.1522(8) 0.3444(9) 0.029(6) Uani 1 d S . 
O2 O 0.5000 0.2443(10) 0.5000 0.035(8) Uani 1 d S . 
O3 O 0.6705(12) 0.1322(12) 0.3295(13) 0.030(8) Uani 1 d S . 
O4 O 0.4171(9) 0.0043(12) 0.30636(9) 0.021(4) Uani 1 d . . 
O5 O 0.6077(10) 0.1097(15) 0.4903(10) 0.041(8) Uani 1 d . . 
O6 O 0.5000 0.0000 0.5000 0.106(7) Uani 1 d S . 
OW1 O 0.7343(12) 0.2657(12) 0.4757(11) 0.175(11) Uani 1 d S . 
OW2 O 0.7583(13) 0.2417(13) 0.3450(13) 0.066(13) Uani 1 d S . 
 
loop_ 
 _atom_site_aniso_label 
 _atom_site_aniso_U_11 
 _atom_site_aniso_U_22 
 _atom_site_aniso_U_33 
 _atom_site_aniso_U_23 
 _atom_site_aniso_U_13 
 _atom_site_aniso_U_12 
As 0.018(2) 0.015(2) 0.018(2) -0.003(2) 0.006(5) 0.002(2) 
V1 0.020(6) 0.023(7) 0.018(6) 0.004(4) -0.002(6) 0.001(4) 
V2 0.025(6) 0.012(9) 0.028(6) 0.000 -0.005(16) 0.000 
V3 0.028(10) 0.018(12) 0.025(10) 0.001(10) 0.006(10) -0.002(10) 
O1 0.025(10) 0.025(12) 0.036(10) 0.000 0.004(12) 0.000 
O2 0.042(13) 0.042(12) 0.023(13) -0.009(10) 0.009(14) -0.009(10) 
O3 0.047(12) 0.027(11) 0.015(12) 0.002(12) -0.004(12) -0.004(12) 
O4 0.018(9) 0.033(10) 0.013(8) -0.011(15) 0.010(7) 0.003(14) 
O5 0.047(12) 0.039(12) 0.037(12) -0.010(16) -0.017(12) 0.011(16) 
O6 0.076(14) 0.165(18) 0.070(19) -0.008(11) -0.035(16) 0.008(16) 
OW1 0.087(19) 0.351(11) 0.087(14) 0.000 0.000 0.000 
OW2 0.087(21) 0.087(21) 0.024(20) -0.006(17) 0.006(17) -0.033(29) 
 
_geom_special_details 
; 
 All esds (except the esd in the dihedral angle between two l.s. planes) 
 are estimated using the full covariance matrix.  The cell esds are taken 
 into account individually in the estimation of esds in distances, angles 
 and torsion angles; correlations between esds in cell parameters are only 
 used when they are defined by crystal symmetry.  An approximate (isotropic) 
 treatment of cell esds is used for estimating esds involving l.s. planes. 
; 
 
loop_ 
 _geom_bond_atom_site_label_1 
 _geom_bond_atom_site_label_2 
 _geom_bond_distance 
 _geom_bond_site_symmetry_2 
 _geom_bond_publ_flag 
As O4 1.676(6) 40_545 ? 
As O4 1.676(6) 39 ? 
As O4 1.676(6) . ? 
As O4 1.676(6) 2_655 ? 
V1 O1 1.620(5) . ? 
V1 O4 1.884(6) 21 ? 
V1 O4 1.884(6) . ? 
V1 O5 2.116(6) 23_656 ? 
V1 O5 2.116(6) 3_656 ? 
V1 V3 2.477(10) 2_655 ? 
V1 V2 2.908(10) . ? 
V2 O2 1.600(8) . ? 
V2 O5 1.913(9) 3_656 ? 
V2 O5 1.913(9) 23_656 ? 
V2 O5 1.913(9) 21 ? 
V2 O5 1.913(9) . ? 
V2 O6 2.461(6) . ? 
V2 V1 2.908(10) 3_656 ? 
V2 V3 2.944(10) 3_656 ? 
V2 V3 2.944(10) . ? 
V3 O3 1.706(9) . ? 
V3 O5 1.834(9) . ? 
V3 O5 1.834(9) 23_656 ? 
V3 O4 1.921(9) 2_655 ? 
V3 O4 1.921(9) 24_655 ? 
V3 V1 2.50(2) 2_655 ? 
O4 V3 1.921(9) 2_655 ? 
O5 V1 2.116(6) 3_656 ? 
O6 V2 2.461(6) 2_655 ? 
 
loop_ 
 _geom_angle_atom_site_label_1 
 _geom_angle_atom_site_label_2 
 _geom_angle_atom_site_label_3 
 _geom_angle 
 _geom_angle_site_symmetry_1 
 _geom_angle_site_symmetry_3 
 _geom_angle_publ_flag 
O4 As O4 110.6(5) 40_545 39 ? 
O4 As O4 108.9(5) 40_545 . ? 
O4 As O4 108.9(5) 39 . ? 
O4 As O4 108.9(5) 40_545 2_655 ? 
O4 As O4 108.9(5) 39 2_655 ? 
O4 As O4 110.6(5) . 2_655 ? 
O1 V1 O4 109.1(6) . 21 ? 
O1 V1 O4 109.1(6) . . ? 
O4 V1 O4 87.2(7) 21 . ? 
O1 V1 O5 100.6(8) . 23_656 ? 
O4 V1 O5 150.3(7) 21 23_656 ? 
O4 V1 O5 85.9(9) . 23_656 ? 
O1 V1 O5 100.5(6) . 3_656 ? 
O4 V1 O5 85.9(10) 21 3_656 ? 
O4 V1 O5 150.3(7) . 3_656 ? 
O5 V1 O5 85.9(7) 23_656 3_656 ? 
O1 V1 V3 140.7(8) . 2_655 ? 
O4 V1 V3 48.5(8) 21 2_655 ? 
O4 V1 V3 48.5(8) . 2_655 ? 
O5 V1 V3 107.9(8) 23_656 2_655 ? 
O5 V1 V3 107.9(8) 3_656 2_655 ? 
O1 V1 V2 103.4(6) . . ? 
O4 V1 V2 123.6(6) 21 . ? 
O4 V1 V2 123.6(6) . . ? 
O5 V1 V2 43.0(9) 23_656 . ? 
O5 V1 V2 43.0(9) 3_656 . ? 
V3 V1 V2 115.9(7) 2_655 . ? 
O2 V2 O5 106.4(9) . 3_656 ? 
O2 V2 O5 106.4(9) . 23_656 ? 
O5 V2 O5 96.6(10) 3_656 23_656 ? 
O2 V2 O5 106.4(9) . 21 ? 
O5 V2 O5 74.1(8) 3_656 21 ? 
O5 V2 O5 147.2(8) 23_656 21 ? 
O2 V2 O5 106.4(9) . . ? 
O5 V2 O5 147.2(8) 3_656 . ? 
O5 V2 O5 74.1(7) 23_656 . ? 
O5 V2 O5 96.6(10) 21 . ? 
O2 V2 O6 180.0 . . ? 
O5 V2 O6 73.6(9) 3_656 . ? 
O5 V2 O6 73.6(9) 23_656 . ? 
O5 V2 O6 73.6(9) 21 . ? 
O5 V2 O6 73.6(9) . . ? 
O2 V2 V1 113.8(3) . . ? 
O5 V2 V1 48.3(10) 3_656 . ? 
O5 V2 V1 48.3(10) 23_656 . ? 
O5 V2 V1 115.9(9) 21 . ? 
O5 V2 V1 115.9(9) . . ? 
O6 V2 V1 66.2(3) . . ? 
O2 V2 V1 113.8(3) . 3_656 ? 
O5 V2 V1 115.9(9) 3_656 3_656 ? 
O5 V2 V1 115.9(9) 23_656 3_656 ? 
O5 V2 V1 48.3(10) 21 3_656 ? 
O5 V2 V1 48.3(10) . 3_656 ? 
O6 V2 V1 66.2(3) . 3_656 ? 
V1 V2 V1 132.4(7) . 3_656 ? 
O2 V2 V3 114.3(5) . 3_656 ? 
O5 V2 V3 37.2(8) 3_656 3_656 ? 
O5 V2 V3 124.4(11) 23_656 3_656 ? 
O5 V2 V3 37.2(9) 21 3_656 ? 
O5 V2 V3 124.4(11) . 3_656 ? 
O6 V2 V3 65.7(5) . 3_656 ? 
V1 V2 V3 80.4(2) . 3_656 ? 
V1 V2 V3 80.4(2) 3_656 3_656 ? 
O2 V2 V3 114.3(5) . . ? 
O5 V2 V3 124.4(11) 3_656 . ? 
O5 V2 V3 37.2(8) 23_656 . ? 
O5 V2 V3 124.4(11) 21 . ? 
O5 V2 V3 37.2(8) . . ? 
O6 V2 V3 65.7(5) . . ? 
V1 V2 V3 80.4(2) . . ? 
V1 V2 V3 80.4(2) 3_656 . ? 
V3 V2 V3 131.4(10) 3_656 . ? 
O3 V3 O5 105.0(10) . . ? 
O3 V3 O5 105.0(10) . 23_656 ? 
O5 V3 O5 79.3(11) . 23_656 ? 
O3 V3 O4 103.9(8) . 2_655 ? 
O5 V3 O4 150.7(7) . 2_655 ? 
O5 V3 O4 89.0(11) 23_656 2_655 ? 
O3 V3 O4 103.9(8) . 24_655 ? 
O5 V3 O4 89.0(11) . 24_655 ? 
O5 V3 O4 150.8(7) 23_656 24_655 ? 
O4 V3 O4 88.5(6) 2_655 24_655 ? 
O3 V3 V1 134.1(10) . 2_655 ? 
O5 V3 V1 109.9(10) . 2_655 ? 
O5 V3 V1 109.9(10) 23_656 2_655 ? 
O4 V3 V1 49.3(9) 2_655 2_655 ? 
O4 V3 V1 49.3(9) 24_655 2_655 ? 
O3 V3 V2 113.6(10) . . ? 
O5 V3 V2 39.8(11) . . ? 
O5 V3 V2 39.8(11) 23_656 . ? 
O4 V3 V2 121.5(8) 2_655 . ? 
O4 V3 V2 121.5(8) 24_655 . ? 
V1 V3 V2 112.3(9) 2_655 . ? 
As O4 V3 128.5(6) . 2_655 ? 
As O4 V1 129.5(5) . . ? 
V3 O4 V1 82.1(7) 2_655 . ? 
V3 O5 V2 103.0(11) . . ? 
V3 O5 V1 142.1(5) . 3_656 ? 
V2 O5 V1 88.7(5) . 3_656 ? 
V2 O6 V2 180.0 2_655 . ? 
 
_refine_diff_density_max    1.235 
_refine_diff_density_min   -2.490 
_refine_diff_density_rms    0.474