Dimerization of Alkynes Promoted by a Pincer-Ligated Iridium Complex. C-C Reductive Elimination Inhibited by Steric Crowding
Rajshekhar Ghosh; Xiawei Zhang; Patrick Achord; Thomas J. Emge; Karsten Krogh-Jespersen; Alan S. Goldman; Journal of the American Chemical Society 129 (2007) 853–866; doi:10.1021/ja0647194

data_4109003
_publ_contact_author_address
; 
 Department of Chemistry 
 Rutgers, The State University of New Jersey
 610 Taylor Road
 Piscataway, New Jersey  08854-8087  U.S.A. 
;
_publ_contact_author_email       agoldman@rutchem.rutgers.edu
_publ_contact_author_name        'Alan S. Goldman'
_publ_section_title
;
 Dimerization of Alkynes Promoted by a Pincer-Ligated Iridium Complex. C-C
 Reductive Elimination Inhibited by Steric Crowding
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              853
_journal_page_last               866
_journal_paper_doi               10.1021/ja0647194
_journal_volume                  129
_journal_year                    2007
_chemical_formula_sum            'C32 H48.67 Ir P2'
_chemical_formula_weight         687.52
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 96.944(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            12
_cell_length_a                   15.6669(12)
_cell_length_b                   28.019(3)
_cell_length_c                   21.1975(16)
_cell_measurement_reflns_used    9493
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.51
_cell_measurement_theta_min      2.32
_cell_volume                     9236.8(14)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  '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  0.0542
_diffrn_reflns_av_sigmaI/netI    0.0493
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       40
_diffrn_reflns_limit_k_min       -40
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            56662
_diffrn_reflns_theta_full        30.57
_diffrn_reflns_theta_max         30.57
_diffrn_reflns_theta_min         1.75
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    4.459
_exptl_absorpt_correction_T_max  0.9568
_exptl_absorpt_correction_T_min  0.5008
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SAINT (SADABS)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.483
_exptl_crystal_description       plane
_exptl_crystal_F_000             4172
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.09
_exptl_crystal_size_min          0.01
_refine_diff_density_max         3.037
_refine_diff_density_min         -1.301
_refine_diff_density_rms         0.124
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     631
_refine_ls_number_reflns         14112
_refine_ls_number_restraints     438
_refine_ls_restrained_S_all      1.168
_refine_ls_R_factor_all          0.0742
_refine_ls_R_factor_gt           0.0434
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0370P)^2^+25.7000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0889
_refine_ls_wR_factor_ref         0.0987
_reflns_number_gt                9826
_reflns_number_total             14112
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja0647194si20060716_051242.cif
_cod_data_source_block           ir_ccph
_cod_original_cell_volume        9236.7(13)
_cod_database_code               4109003