Pyrazolyl-N-heterocyclic carbene complexes of rhodium as hydrogenation catalysts: The influence of ligand steric bulk on catalyst activity
Page, Michael J.; Wagler, Jörg; Messerle, Barbara A.; Dalton Transactions  (2009) 7029–; doi:10.1039/b906724h

data_7002071
_publ_section_title
;
 Pyrazolyl-N-heterocyclic carbene complexes of rhodium as hydrogenation
 catalysts: The influence of ligand steric bulk on catalyst activity
;
_journal_issue                   35
_journal_name_full               'Dalton Transactions'
_journal_page_first              7029
_journal_paper_doi               10.1039/b906724h
_journal_year                    2009
_chemical_formula_moiety         'C24 H30 N4 Rh, C24 H20 B'
_chemical_formula_sum            'C48 H50 B N4 Rh'
_chemical_formula_weight         796.64
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 93.8420(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.1877(2)
_cell_length_b                   9.29080(10)
_cell_length_c                   26.4808(3)
_cell_measurement_reflns_used    162874
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      35.631
_cell_measurement_theta_min      2.546
_cell_volume                     3973.67(8)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Nonius Collect, KappaCCD'
_computing_data_reduction        'Denzo and Scalepak (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEP32 for windows (Farugia)'
_computing_publication_material  'Ciftab (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Nonius Kappa 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  0.0437
_diffrn_reflns_av_sigmaI/netI    0.0429
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       40
_diffrn_reflns_limit_l_min       -42
_diffrn_reflns_number            98011
_diffrn_reflns_theta_full        35.00
_diffrn_reflns_theta_max         35.00
_diffrn_reflns_theta_min         2.59
_exptl_absorpt_coefficient_mu    0.469
_exptl_absorpt_correction_T_max  0.914
_exptl_absorpt_correction_T_min  0.732
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SORTAV
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.332
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       piece
_exptl_crystal_F_000             1664
_exptl_crystal_size_max          0.55
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.672
_refine_diff_density_min         -0.700
_refine_diff_density_rms         0.061
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.017(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1001
_refine_ls_number_reflns         34298
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0360
_refine_ls_R_factor_gt           0.0301
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0285P)^2^+1.0295P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0665
_refine_ls_wR_factor_ref         0.0685
_reflns_number_gt                31658
_reflns_number_total             34298
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b906724h.txt
_cod_data_source_block           mp00301
_cod_original_sg_symbol_Hall     P2yb
_cod_original_sg_symbol_H-M      P21
_cod_database_code               7002071