An unprecedented α-C‒C agostic interaction in a cyclopropyl tris(pyrazolyl)boratoniobium complex
Jaffart, Joëlle; Etienne, Michel; Reinhold, Meike; McGrady, John E.; Maseras, Feliu; Chemical Communications (Cambridge, United Kingdom)  (2003) 876–877; doi:10.1039/b300324h

data_7113556
_publ_section_title
;
 An unprecedented \a-C--C agostic interaction in a cyclopropyl
 tris(pyrazolyl)boratoniobium complex
;
_journal_coden_ASTM              CHCOFS
_journal_issue                   7
_journal_name_full
;
 Chemical Communications (Cambridge, United Kingdom)
;
_journal_page_first              876
_journal_page_last               877
_journal_paper_doi               10.1039/b300324h
_journal_year                    2003
_chemical_formula_moiety         ' C22 H33 Nb1 Cl1 N6 B1 '
_chemical_formula_sum            'C22 H33 B Cl N6 Nb'
_chemical_formula_weight         520.72
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   'Geometric or located (Fourier difference)'
_atom_sites_solution_primary     SIR92
_audit_creation_date             99-05-06
_audit_creation_method           CRYSTALS
_cell_angle_alpha                96.58(2)
_cell_angle_beta                 106.87(2)
_cell_angle_gamma                118.49(2)
_cell_formula_units_Z            2
_cell_length_a                   10.697(2)
_cell_length_b                   10.755(2)
_cell_length_c                   13.164(2)
_cell_measurement_reflns_used    5000
_cell_measurement_temperature    160
_cell_measurement_theta_max      24.18
_cell_measurement_theta_min      2.22
_cell_volume                     1214.8(5)
_computing_cell_refinement       ' STOE IPDS '
_computing_data_collection       ' STOE IPDS '
_computing_data_reduction
;
STOE X RED
;
_computing_molecular_graphics
;
CAMERON (Watkin, Prout & Pearce, 1996)
;
_computing_publication_material
;
CRYSTALS Issue 10 (Watkin, Prout, Carruthers & Betteridge, 1996)
;
_computing_structure_refinement
;
CRYSTALS Issue 10 (Watkin, Prout, Carruthers & Betteridge, 1996)
;
_computing_structure_solution    'SIR92 (Giacovazzo et al, 1992)'
_diffrn_ambient_temperature      160
_diffrn_measurement_device       '  STOE IPDS '
_diffrn_measurement_method       'phi rotation'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.00
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            3607
_diffrn_reflns_theta_max         24.18
_diffrn_reflns_theta_min         2.22
_diffrn_standards_decay_%        0.00
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.63
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            ' orange '
_exptl_crystal_density_diffrn    1.42
_exptl_crystal_description       ' block '
_exptl_crystal_F_000             535.82
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.73
_refine_diff_density_min         -0.45
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_obs   0.9883
_refine_ls_hydrogen_treatment
;
H atoms placed geometrically after each cycle, except H1 to H32 located 
and refined isotropically with an equivalent Uiso for H11 to H32
;
_refine_ls_matrix_type           full
_refine_ls_number_parameters     304
_refine_ls_number_reflns         3195
_refine_ls_R_factor_obs          0.0277
_refine_ls_shift/esd_max         0.008596
_refine_ls_structure_factor_coef F
_refine_ls_weighting_scheme
;
w = w'[1-(?F/6?(F))2]2. w' = 1/?(r=1,3)ArTr(x) where Ar are the coefficients 
for the Chebyshev polynomial Tr(x) with x = Fc/Fc(max) (Carruthers & 
Watkin, 1979)
coef 1.47, -0.132, 0.970
;
_refine_ls_wR_factor_obs         0.0346
_reflns_limit_h_max              11
_reflns_limit_h_min              -12
_reflns_limit_k_max              12
_reflns_limit_k_min              -12
_reflns_limit_l_max              15
_reflns_limit_l_min              0
_reflns_number_observed          3195
_reflns_number_total             0
_reflns_observed_criterion       >2.00\s(I)
_cod_duplicate_entry             7104053
_cod_data_source_file            b300324h.txt
_cod_data_source_block           CRYSTALS_cif_1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic ' changed to 'triclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/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 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        1215(1)
_cod_original_sg_symbol_H-M      'P -1 '
_cod_original_formula_sum        ' C22 H33 Nb1 Cl1 N6 B1 '
_cod_database_code               7113556