Imidazo[1,5-a]pyridin-3-ylidenes as π-accepting carbene ligands: substituent effects on properties of N-heterocyclic carbenes.
Koto, Yuma; Shibahara, Fumitoshi; Murai, Toshiaki; Organic & biomolecular chemistry 15 (2017) 1810–1820; doi:10.1039/c6ob02827f

data_7155473
_publ_section_title
;
 Imidazo[1,5-a]pyridin-3-ylidenes as \p-accepting carbene ligands:
 substituent effects on properties of N-heterocyclic carbenes.
;
_journal_issue                   8
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1810
_journal_page_last               1820
_journal_paper_doi               10.1039/c6ob02827f
_journal_volume                  15
_journal_year                    2017
_chemical_formula_moiety         'C16 H12 Cl N2 O2 Rh'
_chemical_formula_sum            'C16 H12 Cl N2 O2 Rh'
_chemical_formula_weight         402.64
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2yab'
_symmetry_space_group_name_H-M   'P 1 21/a 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2016-11-07 deposited with the CCDC.
2017-01-25 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 100.553(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.875(2)
_cell_length_b                   16.458(4)
_cell_length_c                   12.568(3)
_cell_measurement_reflns_used    4182
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      31.0
_cell_measurement_theta_min      1.6
_cell_volume                     1601.3(7)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      193(2)
_diffrn_detector_area_resol_mean 14.63
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Rigaku/MSC Mercury CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0456
_diffrn_reflns_av_sigmaI/netI    0.0475
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            13157
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         1.65
_exptl_absorpt_coefficient_mu    1.240
_exptl_absorpt_correction_T_max  0.968
_exptl_absorpt_correction_T_min  0.741
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   '(Higashi, 1999)'
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.670
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.769
_refine_diff_density_min         -0.416
_refine_diff_density_rms         0.085
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         3679
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.089
_refine_ls_R_factor_all          0.0579
_refine_ls_R_factor_gt           0.0420
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0315P)^2^+0.9212P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0827
_refine_ls_wR_factor_ref         0.0896
_reflns_number_gt                2971
_reflns_number_total             3679
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ob02827f2.cif
_cod_data_source_block           aprc
_cod_depositor_comments
'Adding full bibliography for 7155472--7155477.cif.'
_cod_original_sg_symbol_H-M      'P 21/a       '
_cod_database_code               7155473