Optimised synthesis of monoanionic bis(NHC)-pincer ligand precursors and their Li-complexes
Jürgens, Eva; Buys, Kai N.; Schmidt, Anna-Theresa; Furfari, Samantha K.; Cole, Marcus L.; Moser, Michael; Rominger, Frank; Kunz, Doris; New J. Chem. 40 (2016) 9160–; doi:10.1039/C6NJ01941B

data_7055764
_publ_section_title
;
 Optimised synthesis of monoanionic bis(NHC)-pincer ligand precursors and
 their Li-complexes
;
_journal_issue                   11
_journal_name_full               'New J. Chem.'
_journal_page_first              9160
_journal_paper_doi               10.1039/C6NJ01941B
_journal_volume                  40
_journal_year                    2016
_chemical_formula_sum            'C35 H51 Br2 N5 O'
_chemical_formula_weight         717.62
_chemical_name_common            HbimcaIPr2HBr
_chemical_name_systematic
'3,6-Di-tert-butyl-1,8-bis(3-isopropylimidazolium)carbazole dibromide'
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2016-04-05 deposited with the CCDC.
2016-09-06 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.0886(3)
_cell_length_b                   18.8973(5)
_cell_length_c                   15.2742(4)
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      30.066
_cell_measurement_theta_min      1.714
_cell_volume                     3777.91(17)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0441
_diffrn_reflns_av_unetI/netI     0.0493
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            40072
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.066
_diffrn_reflns_theta_min         1.714
_diffrn_source                   microsource
_exptl_absorpt_coefficient_mu    2.177
_exptl_absorpt_process_details
'SADABS. Ver. 2014/5. (Krause, L., Herbst-Irmer, R., Sheldrick, G. M. & Stalke, D. (2015). J. Appl. Crystallogr. 48.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.262
_exptl_crystal_description       block
_exptl_crystal_F_000             1496
_exptl_crystal_recrystallization_method 'Re-crystallisation from solvent'
_exptl_crystal_size_max          0.130
_exptl_crystal_size_mid          0.066
_exptl_crystal_size_min          0.036
_refine_diff_density_max         0.765
_refine_diff_density_min         -0.370
_refine_diff_density_rms         0.070
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.528(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.027
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     409
_refine_ls_number_reflns         10984
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0495
_refine_ls_R_factor_gt           0.0334
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0335P)^2^+0.3519P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0655
_refine_ls_wR_factor_ref         0.0699
_reflns_Friedel_coverage         0.933
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                9134
_reflns_number_total             10984
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6nj01941b2.cif
_cod_data_source_block           ipropBimcaKWT
_cod_depositor_comments
'Adding full bibliography for 7055764--7055771.cif.'
_cod_database_code               7055764
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.765
_shelx_estimated_absorpt_t_max   0.926
_shelx_res_checksum              48203
_solvent_exptl_crystal_recrystallization_method isopropanol