Understanding and Predicting Distorted T- versus Y-Geometries for Neutral Chromous Complexes Supported by a Sterically Encumbering β-Diketiminate Ligand
Hongjun Fan; Debashis Adhikari; Anas A. Saleh; Rodney L. Clark; Francisco J. Zuno-Cruz; Gloria Sanchez Cabrera; John C. Huffman; Maren Pink; Daniel J. Mindiola; Mu-Hyun Baik; Journal of the American Chemical Society 130 (2008) 17351–17361; doi:10.1021/ja803798b

data_4108860
_publ_section_title
;
 Understanding and Predicting Distorted T- versus Y-Geometries for Neutral
 Chromous Complexes Supported by a Sterically Encumbering \b-Diketiminate
 Ligand
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17351
_journal_page_last               17361
_journal_paper_doi               10.1021/ja803798b
_journal_volume                  130
_journal_year                    2008
_chemical_formula_sum            'C53 H76 Cr N2 Si'
_chemical_formula_weight         821.25
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   34.221(3)
_cell_length_b                   13.3963(12)
_cell_length_c                   21.1992(19)
_cell_measurement_reflns_used    997
_cell_measurement_temperature    128(2)
_cell_measurement_theta_max      23.24
_cell_measurement_theta_min      2.62
_cell_volume                     9718.5(15)
_computing_cell_refinement       'SAINT (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1999)'
_computing_data_reduction        'SAINT (Bruker, 1999), XTEL (local program)'
_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 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_details
'   0.30 degree frames measured for 30.17 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  0.1540
_diffrn_reflns_av_sigmaI/netI    0.1347
_diffrn_reflns_limit_h_max       44
_diffrn_reflns_limit_h_min       -44
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            98958
_diffrn_reflns_theta_full        27.53
_diffrn_reflns_theta_max         27.53
_diffrn_reflns_theta_min         2.01
_diffrn_standards_decay_%        0.0
_exptl_absorpt_coefficient_mu    0.295
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.123
_exptl_crystal_description       'irregular prism'
_exptl_crystal_F_000             3568
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.904
_refine_diff_density_min         -0.517
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.804
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     818
_refine_ls_number_reflns         11182
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.804
_refine_ls_R_factor_all          0.1184
_refine_ls_R_factor_gt           0.0427
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0269P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0764
_refine_ls_wR_factor_ref         0.0923
_reflns_number_gt                5305
_reflns_number_total             11182
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja803798b_si_005.cif
_cod_data_source_block           04271
_cod_database_code               4108860