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_4112988
_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 H32 B6 Cr O2'
_chemical_formula_weight         277.20
_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                 102.597(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.2238(16)
_cell_length_b                   8.7248(15)
_cell_length_c                   11.0292(19)
_cell_measurement_temperature    193(2)
_cell_volume                     866.2(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.972
_diffrn_measured_fraction_theta_max 0.972
_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  0.0370
_diffrn_reflns_av_sigmaI/netI    0.0343
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            7828
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         2.61
_exptl_absorpt_coefficient_mu    0.646
_exptl_absorpt_correction_T_max  0.914
_exptl_absorpt_correction_T_min  0.706
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'SHELX ellipsoidal'
_exptl_crystal_density_diffrn    1.063
_exptl_crystal_F_000             300
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.685
_refine_diff_density_min         -0.354
_refine_diff_density_rms         0.068
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         2094
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0588
_refine_ls_R_factor_gt           0.0421
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0782P)^2^+0.0845P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1163
_refine_ls_wR_factor_ref         0.1254
_reflns_number_gt                1573
_reflns_number_total             2094
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja046906csi20040810_111000.cif
_cod_data_source_block           f37lell
_cod_database_code               4112988