The “pogo stick” complex [FeCp*{N(SiMe3)2}]: spin state properties, adduct formation with Lewis bases, and reactivity towards weakly Brønsted acidic protonated NHCs
Zinke, Julian; Bruhn, Clemens; Demeshko, Serhiy; Siemeling, Ulrich; Dalton Transactions 54 (2025) 5812–5828; doi:10.1039/D5DT00300H

data_7718199
_publ_section_title
;
 The &#x201C;pogo stick&#x201D; complex [FeCp*{N(SiMe3)2}]: spin state
 properties, adduct formation with Lewis bases, and reactivity towards
 weakly Br\/onsted acidic protonated NHCs
;
_journal_issue                   14
_journal_name_full               'Dalton Transactions'
_journal_page_first              5812
_journal_page_last               5828
_journal_paper_doi               10.1039/D5DT00300H
_journal_volume                  54
_journal_year                    2025
_chemical_formula_moiety         'C35 H37 Br Fe2 N2'
_chemical_formula_sum            'C35 H37 Br Fe2 N2'
_chemical_formula_weight         677.27
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_date             2024-08-07
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_audit_update_record
;
2025-02-05 deposited with the CCDC.	2025-03-03 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 94.026(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.7264(4)
_cell_length_b                   18.7784(6)
_cell_length_c                   14.9961(5)
_cell_measurement_reflns_used    17881
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.20
_cell_measurement_theta_min      1.36
_cell_volume                     3013.13(18)
_computing_cell_refinement       'X-Area Recipe 1.36.0.0 (STOE, 2020)'
_computing_data_collection       'X-Area WinXpose 2.0.22.0 (STOE, 2016)'
_computing_data_reduction
;
X-Area Integrate 1.78.3.0 (STOE, 2020)
X-Area LANA 1.83.8.0 (STOE, 2020)
;
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2019/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2014/4 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector                 'image plate (34 cm diameter)'
_diffrn_detector_area_resol_mean 6.67
_diffrn_detector_type            'STOE Imaging Plate'
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_details
;
 132 frames, detector distance = 130 mm
;
_diffrn_measurement_device       '2-circle diffractometer'
_diffrn_measurement_device_type  'STOE IPDS II'
_diffrn_measurement_method       'rotation method, \w scans'
_diffrn_radiation_collimation    '1.2, 0.6 mm diameter, multiple pinhole'
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_polarisn_norm  270
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0231
_diffrn_reflns_av_unetI/netI     0.0236
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.989
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            12245
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.736
_diffrn_reflns_theta_min         1.740
_diffrn_source                   'Genix Mo HF'
_diffrn_source_current           1.000
_diffrn_source_power             0.050
_diffrn_source_voltage           50
_exptl_absorpt_coefficient_mu    2.316
_exptl_absorpt_correction_T_max  0.7548
_exptl_absorpt_correction_T_min  0.5506
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
STOE X-Red32, absorption correction by Gaussian integration, analogous to
P. Coppens, "The Evaluation of Absorption and Extinction in Single-Crystal
Structure Analysis", published in: F. R. Ahmed (Editor), "Crystallographic
Computing", Munksgaard, Copenhagen (1970), 255 - 270. Afterwards scaling of
reflection intensities was performed within STOE LANA. J. Koziskova, F. Hahn,
J. Richter, J. Kozisek, Acta Chimica Slovaca, vol. 9, no. 2, 2016, pp. 136-140.
;
_exptl_crystal_colour            orange
_exptl_crystal_colour_primary    orange
_exptl_crystal_density_diffrn    1.493
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1392
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.157
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.596
_refine_diff_density_min         -0.240
_refine_diff_density_rms         0.078
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     366
_refine_ls_number_reflns         5690
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0380
_refine_ls_R_factor_gt           0.0306
_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^)+(0.0413P)^2^+2.8518P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0753
_refine_ls_wR_factor_ref         0.0803
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4950
_reflns_number_total             5690
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5dt00300h2.cif
_cod_data_source_block           i3191
_cod_depositor_comments
'Adding full bibliography for 7718189--7718202.cif.'
_cod_database_code               7718199
_shelx_shelxl_version_number     2019/3
_shelx_estimated_absorpt_t_max   0.753
_shelx_estimated_absorpt_t_min   0.654
_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:
 C19(H19A,H19B), C12(H12A,H12B)
2.b Aromatic/amide H refined with riding coordinates:
 C23(H23), C8(H8), C17(H17), C21(H21), C5(H5), C15(H15), C6(H6), C22(H22),
 C10(H10), C11(H11), C14(H14), C18(H18), C9(H9), C24(H24), C25(H25), C4(H4),
 C3(H3), C16(H16)
2.c Idealised Me refined as rotating group:
 C33(H33A,H33B,H33C), C32(H32A,H32B,H32C), C34(H34A,H34B,H34C), C31(H31A,H31B,
 H31C), C35(H35A,H35B,H35C)
;
_shelx_res_checksum              15299
_shelx_hkl_checksum              74797
_olex2_submission_special_instructions 'No special instructions were received'