A new class of functionalized polyoxometalates: synthesis, structure and preliminary antitumor activity studies of three arylimido substituted hexamolybdates bearing a strong electron-withdrawing nitro group, (Bu4N)2[Mo6O18(NAr)] (Ar = 3-NO2-C6H4, 2-CH3-4-NO2-C6H3, 2-CH3-5-NO2-C6H3)
Xue, Sijia; Chai, An; Cai, Zhijuan; Wei, Yongge; Xiang, Changsheng; Bian, Wangdong; Shen, Jian; Dalton Transactions  (2008) 4770–4775; doi:10.1039/b719388b

data_7003767
_publ_section_title
;
 A new class of functionalized polyoxometalates: synthesis, structure
 and preliminary antitumor activity studies of three arylimido
 substituted hexamolybdates bearing a strong electron-withdrawing nitro
 group, (Bu4N)2[Mo6O18(&#xE002;NAr)] (Ar = 3-NO2-C6H4,
 2-CH3-4-NO2-C6H3, 2-CH3-5-NO2-C6H3)
;
_journal_issue                   35
_journal_name_full               'Dalton Transactions'
_journal_page_first              4770
_journal_page_last               4775
_journal_paper_doi               10.1039/b719388b
_journal_year                    2008
_chemical_formula_sum            'C39 H78 Mo6 N4 O20'
_chemical_formula_weight         1498.69
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 91.0320(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.6532(9)
_cell_length_b                   16.7588(9)
_cell_length_c                   20.2461(11)
_cell_measurement_reflns_used    9708
_cell_measurement_temperature    297(2)
_cell_measurement_theta_max      26.90
_cell_measurement_theta_min      2.34
_cell_volume                     5649.5(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      297(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_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  0.0279
_diffrn_reflns_av_sigmaI/netI    0.0211
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            53013
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.99
_exptl_absorpt_coefficient_mu    1.361
_exptl_absorpt_correction_T_max  0.8759
_exptl_absorpt_correction_T_min  0.7725
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.762
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             3008
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         1.557
_refine_diff_density_min         -2.186
_refine_diff_density_rms         0.142
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.109
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     526
_refine_ls_number_reflns         9926
_refine_ls_number_restraints     333
_refine_ls_restrained_S_all      1.120
_refine_ls_R_factor_all          0.1029
_refine_ls_R_factor_gt           0.0843
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0012P)^2^+63.2290P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1691
_refine_ls_wR_factor_ref         0.1778
_reflns_number_gt                7439
_reflns_number_total             9926
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b719388b.txt
_cod_data_source_block           2
_cod_original_sg_symbol_H-M      'P 2(1)/c'
_cod_database_code               7003767