The synthesis of W-O-W μ-oxo clusters by hydrolysis of tungsten aminoalkoxides and their structural characterisation.
Choujaa, Hamid; Johnson, Andrew L.; Kociok-Köhn, Gabriele; Molloy, Kieran C.; Dalton transactions (Cambridge, England : 2003) 41 (2012) 11393–11401; doi:10.1039/c2dt30966a

data_7020200
_publ_section_title
;
 The synthesis of W-O-W \m-oxo clusters by hydrolysis of tungsten
 aminoalkoxides and their structural characterisation.
;
_journal_issue                   37
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              11393
_journal_page_last               11401
_journal_paper_doi               10.1039/c2dt30966a
_journal_volume                  41
_journal_year                    2012
_chemical_formula_moiety         'C40 H96 N12 O14 W4'
_chemical_formula_sum            'C40 H96 N12 O14 W4'
_chemical_formula_weight         1704.69
_space_group_IT_number           88
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4ad'
_symmetry_space_group_name_H-M   'I 41/a :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            4
_cell_length_a                   24.9274(2)
_cell_length_b                   24.9274(2)
_cell_length_c                   9.68370(10)
_cell_measurement_reflns_used    55569
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      30.034
_cell_measurement_theta_min      2.910
_cell_volume                     6017.21(9)
_computing_cell_refinement       'HKL Scalepack (Otwinski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
;
DENZO-SCALEPACK Z. Otwinowski and W. Minor, "
Processing of X-ray Diffraction Data Collected in Oscillation Mode ",
Methods in Enzymology, Volume 276: Macromolecular Crystallography,
part A, p.307-326, 1997,C.W. Carter, Jr. & R. M. Sweet, Eds., Academic Press.
;
_computing_molecular_graphics
'ORTEP3 for Windows - Farrugia, L. J. J. Appl. Crystallogr. 1997, 30, 565'
_computing_publication_material
;
'WinGX publication routines, Farrugia,
L. J., J. Appl. Crystallogr., 1999, 32, 837-838
;
_computing_structure_refinement
;
SHELXL97 -Program for Crystal Structure Analysis (Release 97-2).
Sheldrick, G.M., Institut f\"ur Anorganische Chemie der Universit\"at,
Tammanstrasse 4, D-3400 G\"ottingen, Germany, 1998
;
_computing_structure_solution
;
SIR97- Altomare A., Burla M.C., Camalli M., Cascarano G.L., Giacovazzo C. ,
Guagliardi A., Moliterni A.G.G., Polidori G.,Spagna R.
(1999) J. Appl. Cryst. 32, 115-119
;
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       '323 1.7 degree images with \w 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  0.0569
_diffrn_reflns_av_sigmaI/netI    0.0193
_diffrn_reflns_limit_h_max       34
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       35
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            71613
_diffrn_reflns_theta_full        30.03
_diffrn_reflns_theta_max         30.03
_diffrn_reflns_theta_min         5.40
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    7.685
_exptl_absorpt_correction_T_max  0.6999
_exptl_absorpt_correction_T_min  0.2496
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements
Sortav (Blessing 1995)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.882
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             3312
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         1.717
_refine_diff_density_min         -1.326
_refine_diff_density_rms         0.128
_refine_ls_extinction_coef       0.00064(3)
_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   1.132
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     166
_refine_ls_number_reflns         4370
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.132
_refine_ls_R_factor_all          0.0284
_refine_ls_R_factor_gt           0.0248
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0321P)^2^+14.8729P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0596
_refine_ls_wR_factor_ref         0.0613
_reflns_number_gt                3988
_reflns_number_total             4370
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt30966a.txt
_cod_data_source_block           shelxl7
_cod_original_sg_symbol_H-M      'I 41/a'
_cod_database_code               7020200