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_7013661
_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            'C34 H30 Mo2 N6 O8'
_chemical_formula_weight         842.5
_chemical_name_common
'Tetraoxotetrapyridinesquaratodimolybdenum(V) pyridine (1/2)'
_chemical_name_systematic
;
Tetraoxotetrapyridinesquaratodimolybdenum(V) pyridine (1/2)
;
_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                 91.3470(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   17.1101(7)
_cell_length_b                   11.1614(5)
_cell_length_c                   35.7999(15)
_cell_measurement_temperature    90(2)
_cell_volume                     6834.9(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      90(2)
_diffrn_detector_area_resol_mean '512 x 512'
_diffrn_measured_fraction_theta_full 0.934
_diffrn_measured_fraction_theta_max 0.934
_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  0.0307
_diffrn_reflns_av_sigmaI/netI    0.0310
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       53
_diffrn_reflns_limit_l_min       -53
_diffrn_reflns_number            89080
_diffrn_reflns_theta_full        32.99
_diffrn_reflns_theta_max         32.99
_diffrn_reflns_theta_min         1.63
_exptl_absorpt_coefficient_mu    0.794
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS SHELXL-97 (Sheldrick, 1997)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.638
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             3392
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         1.231
_refine_diff_density_min         -0.590
_refine_diff_density_rms         0.096
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.067
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     901
_refine_ls_number_reflns         24054
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.067
_refine_ls_R_factor_all          0.0428
_refine_ls_R_factor_gt           0.0340
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0267P)^2^+6.8029P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0736
_refine_ls_wR_factor_ref         0.0767
_reflns_number_gt                20517
_reflns_number_total             24054
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b311348e.txt
_cod_data_source_block           1b
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7013661