Niobium Bis-alkylidene Complexes Prepared by a Multi-Electron Redox Process
Kilgore, Uriah J.; Tomaszewski, John; Fan, Hongjun; Huffman, John C.; Mindiola, Daniel J.; Organometallics 26 (2007) 6132–; doi:10.1021/om7008233

data_4074019
_publ_section_title
;
 Niobium Bis-alkylidene Complexes Prepared by a Multi-Electron Redox
 Process
;
_journal_issue                   25
_journal_name_full               Organometallics
_journal_page_first              6132
_journal_paper_doi               10.1021/om7008233
_journal_volume                  26
_journal_year                    2007
_chemical_formula_sum            'C30 H50 Cl N Nb P2 Si'
_chemical_formula_weight         643.10
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 101.02(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.797(2)
_cell_length_b                   16.224(3)
_cell_length_c                   21.789(4)
_cell_measurement_reflns_used    1972
_cell_measurement_temperature    128(2)
_cell_measurement_theta_max      30.00
_cell_measurement_theta_min      2.28
_cell_volume                     3399.4(12)
_computing_cell_refinement       'SAINT (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1999)'
_computing_data_reduction        'SAINT (Bruker, 1999), XTEL (local package)'
_computing_molecular_graphics    'Reciprocal Net (http://recipnet.org)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      128(2)
_diffrn_detector                 'CCD area detector'
_diffrn_detector_area_resol_mean 44.52
_diffrn_detector_type            'Bruker SMART 6000'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_details
'   0.30 degree frames measured for 15.16 seconds each'
_diffrn_measurement_device       'three-circle goniometer with fixed chi'
_diffrn_measurement_device_type  'Bruker Platform goniometer'
_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  0.0482
_diffrn_reflns_av_sigmaI/netI    0.0270
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            76680
_diffrn_reflns_theta_full        30.03
_diffrn_reflns_theta_max         30.03
_diffrn_reflns_theta_min         1.90
_diffrn_standards_decay_%        0.0
_exptl_absorpt_coefficient_mu    0.581
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.257
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'cleaved prism'
_exptl_crystal_F_000             1356
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.17
_refine_diff_density_max         1.248
_refine_diff_density_min         -0.958
_refine_diff_density_rms         0.084
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     523
_refine_ls_number_reflns         9936
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.040
_refine_ls_R_factor_all          0.0458
_refine_ls_R_factor_gt           0.0374
_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^)+(0.0611P)^2^+2.1285P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1028
_refine_ls_wR_factor_ref         0.1078
_reflns_number_gt                8344
_reflns_number_total             9936
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om7008233.cif
_cod_data_source_block           06154
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P2(1)/n  '
_cod_database_code               4074019