Novel molybdenum(V) squarato complexes based on the dinuclear metal‒metal bonded unit: syntheses and structural characterization of dinuclear [Mo2O4(C4O4)(R-Py)4] and tetranuclear [Mo4O8(C4O4)4]4−
Barbara Modec; Jurij V. Brenčič; Eric M. Burkholder; Jon Zubieta; Dalton Trans.  (2003) 4618–4625; doi:10.1039/b311348e

data_7013665
_publ_section_title
;
 Novel molybdenum(V) squarato complexes based on the dinuclear
 metal--metal bonded unit: syntheses and structural characterization of
 dinuclear [Mo2O4(C4O4)(R-Py)4] and tetranuclear
 [Mo4O8(C4O4)4]4&#x2212;
;
_journal_issue                   24
_journal_name_full               'Dalton Trans.'
_journal_page_first              4618
_journal_page_last               4625
_journal_paper_doi               10.1039/b311348e
_journal_year                    2003
_chemical_formula_sum            'C24 H29 Cl2 Mo4 N5 O10'
_chemical_formula_weight         1002.18
_chemical_name_common
;dichlorodimethoxooctaoxotetrapyridinetetramolybdenum(V)
acetonitrile (1/1)
;
_chemical_name_systematic
;
dichlorodimethoxooctaoxotetrapyridinetetramolybdenum(V) acetonitrile (1/1)
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 103.3471(9)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   25.5660(5)
_cell_length_b                   12.8020(3)
_cell_length_c                   10.1968(2)
_cell_measurement_temperature    150(2)
_cell_volume                     3247.23(12)
_computing_cell_refinement       'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_data_reduction        'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Nonius Kappa CCD diffractometer'
_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  0.0194
_diffrn_reflns_av_sigmaI/netI    0.0320
_diffrn_reflns_limit_h_max       33
_diffrn_reflns_limit_h_min       -33
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            7130
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    1.734
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    2.050
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1960
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.889
_refine_diff_density_min         -0.779
_refine_diff_density_rms         0.109
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     205
_refine_ls_number_reflns         3725
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0402
_refine_ls_R_factor_gt           0.0314
_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^)+(0.0336P)^2^+12.2737P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0742
_refine_ls_wR_factor_ref         0.0793
_reflns_number_gt                3189
_reflns_number_total             3725
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b311348e.txt
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               7013665