A New Class of CVD Precursors to Metal Borides: Cr(B3H8)2 and Related Octahydrotriborate Complexes
Dean M. Goedde; Gregory S. Girolami; Journal of the American Chemical Society 126 (2004) 12230–12231; doi:10.1021/ja046906c

data_4112990
_publ_section_title
;
 A New Class of CVD Precursors to Metal Borides: Cr(B3H8)2 and Related
 Octahydrotriborate Complexes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12230
_journal_page_last               12231
_journal_paper_doi               10.1021/ja046906c
_journal_volume                  126
_journal_year                    2004
_chemical_formula_sum            'C8 H36 B6 Cr O2'
_chemical_formula_weight         281.23
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 110.589(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.0764(17)
_cell_length_b                   16.985(4)
_cell_length_c                   7.985(2)
_cell_measurement_temperature    153(2)
_cell_volume                     898.4(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.968
_diffrn_measured_fraction_theta_max 0.968
_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  0.0963
_diffrn_reflns_av_sigmaI/netI    0.0945
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            7681
_diffrn_reflns_theta_full        28.25
_diffrn_reflns_theta_max         28.25
_diffrn_reflns_theta_min         2.40
_exptl_absorpt_coefficient_mu    0.623
_exptl_absorpt_correction_T_max  0.932
_exptl_absorpt_correction_T_min  0.700
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'SHELX ellipsoidal'
_exptl_crystal_density_diffrn    1.040
_exptl_crystal_F_000             308
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.333
_refine_diff_density_min         -0.434
_refine_diff_density_rms         0.063
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.924
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     151
_refine_ls_number_reflns         2157
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.924
_refine_ls_R_factor_all          0.0871
_refine_ls_R_factor_gt           0.0401
_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^)+(0.0306P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0733
_refine_ls_wR_factor_ref         0.0841
_reflns_number_gt                1352
_reflns_number_total             2157
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja046906csi20040810_111051.cif
_cod_data_source_block           h40kell
_cod_database_code               4112990