Acid-responsive rhenium(I) NHC complexes: pyrazine <i>vs.</i> pyridine.
Abate, Pedro O.; Rizo, José Francisco; Fernández-de-Córdova, Francisco José; Ros, Abel; Rivada-Wheelaghan, Orestes; Dalton transactions (Cambridge, England : 2003) 55 (2026) 4677–4686; doi:10.1039/d6dt00158k

data_7720279
_publ_section_title
;
 Acid-responsive rhenium(I) NHC complexes: pyrazine <i>vs.</i> pyridine.
;
_journal_issue                   11
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4677
_journal_page_last               4686
_journal_paper_doi               10.1039/d6dt00158k
_journal_volume                  55
_journal_year                    2026
_chemical_formula_moiety         'C22 H21 N5 O3 Re, B F4, C7 H8'
_chemical_formula_sum            'C29 H29 B F4 N5 O3 Re'
_chemical_formula_weight         768.58
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2023-04-25
_audit_creation_method
;
Olex2 1.5
(compiled 2023.03.06 svn.rbb2c1857 for OlexSys, GUI svn.r6748)
;
_audit_update_record
;
2025-12-16 deposited with the CCDC.	2026-02-20 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 103.353(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   19.606(2)
_cell_length_b                   9.9870(10)
_cell_length_c                   16.0179(12)
_cell_measurement_reflns_used    9694
_cell_measurement_temperature    193.00
_cell_measurement_theta_max      28.30
_cell_measurement_theta_min      2.30
_cell_volume                     3051.6(5)
_computing_cell_refinement       'SAINT V8.40B (?, 2016)'
_computing_data_reduction        'SAINT V8.40B (?, 2016)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL  (Sheldrick, 2008)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      193.00
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0574
_diffrn_reflns_av_unetI/netI     0.0253
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       26
_diffrn_reflns_limit_h_min       -26
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            92714
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.308
_diffrn_reflns_theta_min         2.135
_diffrn_source_current           1.4
_diffrn_source_power             0.07
_diffrn_source_voltage           50.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    4.045
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.5838
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.0770 before and 0.0565 after correction.
The Ratio of minimum to maximum transmission is 0.7829.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            yellow
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    1.673
_exptl_crystal_description       prism
_exptl_crystal_F_000             1512
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: Toluene - CH3CN'
_exptl_crystal_size_max          0.12
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.02
_refine_diff_density_max         1.183
_refine_diff_density_min         -1.437
_refine_diff_density_rms         0.124
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.143
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     393
_refine_ls_number_reflns         7587
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.143
_refine_ls_R_factor_all          0.0427
_refine_ls_R_factor_gt           0.0349
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0272P)^2^+8.6881P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0743
_refine_ls_wR_factor_ref         0.0774
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6636
_reflns_number_total             7587
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d6dt00158k3.cif
_cod_data_source_block           orw1023a_0ma
_cod_depositor_comments
'Adding full bibliography for 7720278--7720280.cif.'
_cod_database_code               7720279
_shelx_shelxl_version_number     2019/1
_shelx_estimated_absorpt_t_max   0.923
_shelx_estimated_absorpt_t_min   0.642
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Secondary CH2 refined with riding coordinates:
 C5(H5A,H5B)
2.b Aromatic/amide H refined with riding coordinates:
 C28(H28), C29(H29), C2(H2), C3(H3), C6(H6), C7(H7), C10(H10), C20(H20),
 C21(H21), C22(H22), C25(H25), C26(H26)
2.c Idealised Me refined as rotating group:
 C30(H30A,H30B,H30C), C13(H13A,H13B,H13C), C14(H14A,H14B,H14C), C18(H18A,H18B,
 H18C), C24(H24A,H24B,H24C)
;
_shelx_res_checksum              52729
_shelx_hkl_checksum              19877
_olex2_submission_special_instructions 'No special instructions were received'