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_7155477
_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         'C18 H12 Cl N2 O2 Rh'
_chemical_formula_sum            'C18 H12 Cl N2 O2 Rh'
_chemical_formula_weight         426.66
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -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                95.006(2)
_cell_angle_beta                 104.3135(19)
_cell_angle_gamma                101.011(3)
_cell_formula_units_Z            2
_cell_length_a                   7.0475(15)
_cell_length_b                   9.2569(18)
_cell_length_c                   14.015(3)
_cell_measurement_reflns_used    3123
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      31.0
_cell_measurement_theta_min      2.3
_cell_volume                     860.9(3)
_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 0.982
_diffrn_measured_fraction_theta_max 0.982
_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  0.0225
_diffrn_reflns_av_sigmaI/netI    0.0372
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            6785
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.26
_exptl_absorpt_coefficient_mu    1.158
_exptl_absorpt_correction_T_max  0.561
_exptl_absorpt_correction_T_min  0.371
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(Jacobson, 1998)'
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.646
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             424
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.503
_refine_diff_density_min         -0.933
_refine_diff_density_rms         0.071
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.009
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         3874
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.009
_refine_ls_R_factor_all          0.0308
_refine_ls_R_factor_gt           0.0283
_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^)+(0.0434P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0716
_refine_ls_wR_factor_ref         0.0727
_reflns_number_gt                3522
_reflns_number_total             3874
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c6ob02827f2.cif
_cod_data_source_block           azaccphrhco
_cod_depositor_comments
'Adding full bibliography for 7155472--7155477.cif.'
_cod_original_sg_symbol_H-M      'P -1         '
_cod_database_code               7155477