Transition metal dicarbollide complexes: synthesis, molecular, crystal and electronic structures of [M(C2B9H11)(NMe2)3] (M = Nb or Ta) and their insertion reactions with CO2 and CS2 †
Batsanov, Andrei S.; Churakov, Andrei V.; Howard, Judith A. K.; Hughes, Andrew K.; Johnson, Andrew L.; Kingsley, Andrew J.; Neretin, Ivan S.; Wade, Ken; Journal of the Chemical Society, Dalton Transactions  (1999) 3867–; doi:10.1039/a905075b

data_7027627
_publ_section_title
;
 Transition metal dicarbollide complexes: synthesis, molecular, crystal
 and electronic structures of [M(C2B9H11)(NMe2)3] (M&#x2005;=&#x2005;Nb or
 Ta) and their insertion reactions with CO2 and CS2&#x200A;&#x2020;
;
_journal_issue                   21
_journal_name_full
'Journal of the Chemical Society, Dalton Transactions'
_journal_page_first              3867
_journal_paper_doi               10.1039/a905075b
_journal_year                    1999
_chemical_formula_sum            'C10 H30 N5 Ta'
_chemical_formula_weight         401.34
_chemical_name_systematic
; 
 pentakis(dimethylamido)tantalum(V) 
;
_space_group_IT_number           63
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-C 2c 2'
_symmetry_space_group_name_H-M   'C m c m'
_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                   13.845(3)
_cell_length_b                   7.900(2)
_cell_length_c                   14.544(3)
_cell_measurement_reflns_used    478
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27
_cell_measurement_theta_min      5
_cell_volume                     1590.8(6)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'SMART 1K CCD area detector'
_diffrn_measurement_method       '\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  0.0497
_diffrn_reflns_av_sigmaI/netI    0.0226
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            5601
_diffrn_reflns_theta_full        27.44
_diffrn_reflns_theta_max         27.44
_diffrn_reflns_theta_min         2.97
_diffrn_standards_decay_%        0
_diffrn_standards_number         'not measured'
_exptl_absorpt_coefficient_mu    6.898
_exptl_absorpt_correction_T_max  0.251
_exptl_absorpt_correction_T_min  0.039
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
 XPREP (SHELXTL) on Laue equivalents. Before correction, R(int)=0.132. 
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.676
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             792
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.30
_refine_diff_density_max         1.914
_refine_diff_density_min         -0.713
_refine_diff_density_rms         0.170
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.217
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     81
_refine_ls_number_reflns         985
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.217
_refine_ls_R_factor_all          0.0269
_refine_ls_R_factor_gt           0.0267
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0458P)^2^+0.7593P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0656
_refine_ls_wR_factor_ref         0.0661
_reflns_number_gt                979
_reflns_number_total             985
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            905075bsup1.cif
_cod_data_source_block           (2)
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from
2011-04-26.

'_exptl_absorpt_correction_type' value 'multiscan'
changed to 'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      Cmcm
_cod_database_code               7027627