Mixed amido-/imido-/guanidinato niobium complexes: synthesis and the effect of ligands on insertion reactions.
Elorriaga, David; Carrillo-Hermosilla, Fernando; Antiñolo, Antonio; López-Solera, Isabel; Fernández-Galán, Rafael; Villaseñor, Elena; Dalton transactions (Cambridge, England : 2003) 43 (2014) 17434–17444; doi:10.1039/c4dt01975j

data_7032695
_publ_section_title
;
 Mixed amido-/imido-/guanidinato niobium complexes: synthesis and the
 effect of ligands on insertion reactions.
;
_journal_issue                   46
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              17434
_journal_page_last               17444
_journal_paper_doi               10.1039/c4dt01975j
_journal_volume                  43
_journal_year                    2014
_chemical_formula_sum            'C25 H49 N6 Nb'
_chemical_formula_weight         526.61
_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                 128.288(11)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   22.658(5)
_cell_length_b                   9.5025(17)
_cell_length_c                   17.340(4)
_cell_measurement_reflns_used    1818
_cell_measurement_temperature    260(2)
_cell_measurement_theta_max      23.1121
_cell_measurement_theta_min      2.2904
_cell_volume                     2930.4(12)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      260(2)
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.983
_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  0.0985
_diffrn_reflns_av_sigmaI/netI    0.1310
_diffrn_reflns_limit_h_max       32
_diffrn_reflns_limit_h_min       -32
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            26779
_diffrn_reflns_theta_full        30.62
_diffrn_reflns_theta_max         30.62
_diffrn_reflns_theta_min         2.29
_exptl_absorpt_coefficient_mu    0.432
_exptl_absorpt_correction_T_max  0.7461
_exptl_absorpt_correction_T_min  0.6546
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.194
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prismatic
_exptl_crystal_F_000             1128
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.408
_refine_diff_density_min         -0.616
_refine_diff_density_rms         0.086
_refine_ls_extinction_coef       0.0061(4)
_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   0.943
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     304
_refine_ls_number_reflns         8896
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.943
_refine_ls_R_factor_all          0.1382
_refine_ls_R_factor_gt           0.0523
_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^)+(0.0378P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0940
_refine_ls_wR_factor_ref         0.1206
_reflns_number_gt                4572
_reflns_number_total             8896
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4dt01975j2.cif
_cod_data_source_block           3
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2827 2014-09-09 07:05:25Z andrius 

 Adding full bibliography for 7032694--7032696.cif.
;
_cod_original_cell_volume        2930.4(11)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7032695