Disentangling chemical pressure and superexchange effects in lanthanide–organic valence tautomerism
Viborg, Anton; Dunstan, Maja A.; Yutronkie, Nathan J.; Chanda, Amit; Trier, Felix; Pryds, Nini; Wilhelm, Fabrice; Rogalev, Andrei; Pinkowicz, Dawid; Pedersen, Kasper S.; Chemical Science 16 (2025) 6879–6885; doi:10.1039/D5SC01246E

data_1574084
_publ_section_title
;
 Disentangling chemical pressure and superexchange effects in
 lanthanide--organic valence tautomerism
;
_journal_issue                   16
_journal_name_full               'Chemical Science'
_journal_page_first              6879
_journal_page_last               6885
_journal_paper_doi               10.1039/D5SC01246E
_journal_volume                  16
_journal_year                    2025
_chemical_formula_moiety         'C12 H16 I2 N4 O Sm'
_chemical_formula_sum            'C12 H16 I2 N4 O Sm'
_chemical_formula_weight         636.44
_chemical_name_systematic
catena-[bis(pyrazine)-tetrahydrofurane-diiodo-samarium(iii)]
_chemical_properties_physical    Air-sensitive,Moisture-sensitive
_space_group_crystal_system      monoclinic
_space_group_IT_number           11
_space_group_name_Hall           '-P 2yb'
_space_group_name_H-M_alt        'P 1 21/m 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2024-11-13
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_audit_update_record
;
2025-01-28 deposited with the CCDC.	2025-03-07 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.4456(15)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   8.94497(13)
_cell_length_b                   7.93580(13)
_cell_length_c                   12.43051(18)
_cell_measurement_reflns_used    8790
_cell_measurement_temperature    169.99(10)
_cell_measurement_theta_max      76.1080
_cell_measurement_theta_min      3.4980
_cell_volume                     880.79(2)
_computing_cell_refinement       'CrysAlisPro 1.171.44.68a (Rigaku OD, 2024)'
_computing_data_collection
'CrysAlisPro system (CCD 43.136a 64-bit (release 23-08-2024))'
_computing_data_reduction        'CrysAlisPro 1.171.44.68a (Rigaku OD, 2024)'
_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    'SHELXS  (Sheldrick, 2008)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      169.99(10)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 10.6146
_diffrn_detector_type            Atlas
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_details
;
List of Runs (angles in degrees, time in seconds):

  # Type    Start    End  Width  t~exp~   \w     \q     \k     \f   Frames
  1  \w    -66.00  33.00   1.00    3.21    --  -41.06  38.00-180.00   99
  2  \w    -66.00  33.00   1.00    3.21    --  -41.06  38.00 -30.00   99
  3  \w    -66.00  33.00   1.00    3.21    --  -41.06  38.00 -30.00   99
  4  \w    -66.00  33.00   1.00    3.21    --  -41.06  38.00-180.00   99
  5  \w    -66.00  33.00   1.00    3.21    --  -41.06  38.00-120.00   99
  6  \w    -69.00  32.00   1.00    3.21    --  -41.06  57.00  60.00  101
  7  \w      7.00  34.00   1.00    3.21    --   41.06  83.00 -38.55   27
  8  \w      4.00  30.00   1.00    3.21    --   41.06  89.00-137.10   26
  9  \w      6.00  81.00   1.00    3.21    --   41.06 -99.00  60.00   75
 10  \w      7.00  34.00   1.00    3.21    --   41.06  83.00 -13.77   27
 11  \w      5.00  31.00   1.00    3.21    --   41.06  87.00 168.08   26
 12  \w     84.00 178.00   1.00   12.87    --  112.00  30.00-150.00   94
 13  \w     39.00 138.00   1.00   12.87    --  112.00 -45.00-150.00   99
 14  \w     36.00 145.00   1.00   12.87    --  112.00 -77.00-150.00  109
 15  \w     61.00 146.00   1.00   12.87    --  112.00 178.00  90.00   85
 16  \w     39.00 109.00   1.00   12.87    --  112.00-111.00  90.00   70
 17  \w     39.00 109.00   1.00   12.87    --  112.00-111.00 120.00   70
 18  \w     30.00 165.00   1.00   12.87    --  112.00 -15.00   0.00  135
 19  \w     59.00 178.00   1.00   12.87    --  112.00  15.00   0.00  119
 20  \w     39.00 109.00   1.00   12.87    --  112.00-111.00 -30.00   70
 21  \w     29.00 107.00   1.00   12.87    --  112.00 -94.00  30.00   78
 22  \w     39.00 109.00   1.00   12.87    --  112.00-111.00-150.00   70
 23  \w     39.00 109.00   1.00   12.87    --  112.00-111.00-150.00   70
 24  \w     84.00 178.00   1.00   12.87    --  112.00  30.00 -90.00   94
 25  \w     84.00 178.00   1.00   12.87    --  112.00  30.00 -90.00   94
 26  \w     39.00 109.00   1.00   12.87    --  112.00-111.00  60.00   70
 27  \w     40.00 141.00   1.00   12.87    --  112.00 -61.00  90.00  101
 28  \w     84.00 178.00   1.00   12.87    --  112.00  30.00-150.00   94
 29  \w     30.00 165.00   1.00   12.87    --  112.00 -15.00   0.00  135
 30  \w     29.00 107.00   1.00   12.87    --  112.00 -94.00-120.00   78
 31  \w     36.00 145.00   1.00   12.87    --  112.00 -77.00-150.00  109
 32  \w    103.00 178.00   1.00   12.87    --  112.00  77.00 120.00   75
 33  \w     29.00 107.00   1.00   12.87    --  112.00 -94.00-120.00   78
 34  \w   -115.00 -17.00   1.00    3.21    --  -41.06 -38.00   0.00   98
 35  \w      6.00  32.00   1.00    3.21    --   41.06  85.00  48.17   26
 36  \w     13.00 114.00   1.00    3.21    --   41.06  57.00 150.00  101
 37  \w      8.00  42.00   1.00    3.21    --   41.06  81.00 109.64   34
 38  \w      8.00  42.00   1.00    3.21    --   41.06  80.00-106.68   34
 39  \w      7.00  42.00   1.00    3.21    --   41.06  82.00  -0.04   35
 40  \w     17.00 115.00   1.00    3.21    --   41.06  38.00 -90.00   98
 41  \w     27.00  95.00   1.00    3.21    --   41.06-125.00 -90.00   68
 42  \w      6.00  33.00   1.00    3.21    --   41.06  84.00  71.25   27
 43  \w     83.00 121.00   1.00   12.87    --  112.00  61.00 120.00   38
 44  \w     86.00 178.00   1.00   12.87    --  112.00  45.00  30.00   92
 45  \w     84.00 178.00   1.00   12.87    --  112.00  30.00  90.00   94
;
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at home/near, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_type
'CrysAlisPro convention (1999,Acta A55,543-557)'
_diffrn_orient_matrix_UB_11      0.0145871000
_diffrn_orient_matrix_UB_12      -0.1516003000
_diffrn_orient_matrix_UB_13      -0.0760978000
_diffrn_orient_matrix_UB_21      -0.0645506000
_diffrn_orient_matrix_UB_22      0.1068900000
_diffrn_orient_matrix_UB_23      -0.0952465000
_diffrn_orient_matrix_UB_31      0.1593698000
_diffrn_orient_matrix_UB_32      0.0570966000
_diffrn_orient_matrix_UB_33      -0.0235553000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0679
_diffrn_reflns_av_unetI/netI     0.0273
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            18187
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         76.418
_diffrn_reflns_theta_min         3.562
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    52.563
_exptl_absorpt_correction_T_max  0.406
_exptl_absorpt_correction_T_min  0.042
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.44.68a (Rigaku Oxford Diffraction, 2024)
Numerical absorption correction based on gaussian integration over
a multifaceted crystal model
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'dark blue'
_exptl_crystal_colour_modifier   dark
_exptl_crystal_colour_primary    blue
_exptl_crystal_density_diffrn    2.400
_exptl_crystal_description       plank
_exptl_crystal_F_000             584
_exptl_crystal_preparation
'A tetrahydrofuran solution of SmI2 was added to a melt of pyrazine and cooled.,Magnetic properties'
_exptl_crystal_recrystallization_method
'Single crystals were obtained directly from the reaction mixture'
_exptl_crystal_size_max          0.108
_exptl_crystal_size_mid          0.039
_exptl_crystal_size_min          0.027
_refine_diff_density_max         3.106
_refine_diff_density_min         -1.077
_refine_diff_density_rms         0.245
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     115
_refine_ls_number_reflns         1974
_refine_ls_number_restraints     60
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0550
_refine_ls_R_factor_gt           0.0504
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1062P)^2^+0.4527P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1331
_refine_ls_wR_factor_ref         0.1400
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1773
_reflns_number_total             1974
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5sc01246e2.cif
_cod_data_source_block           SmI2pyz2thf_170k
_cod_depositor_comments
'Adding full bibliography for 1574084--1574088.cif.'
_cod_database_code               1574084
_shelx_shelxl_version_number     2019/3
_chemical_oxdiff_formula         'C12 H16 N4 O I2 Sm '
_shelx_estimated_absorpt_t_max   0.331
_shelx_estimated_absorpt_t_min   0.070
_diffrn_oxdiff_digest_od_ed
;

;
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
2. Uiso/Uaniso restraints and constraints
O1 \\sim C5 \\sim C6 \\sim C7 \\sim C8: within 2A with sigma of 0.04 and sigma
for terminal atoms of 0.08 within 2A
3. Rigid body (RIGU) restrains
 O1, C5, C6, C7, C8
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
4. Others
 Fixed Sof: C5(0.5) H5A(0.5) H5B(0.5) C6(0.5) H6A(0.5) H6B(0.5) C7(0.5)
 H7A(0.5) H7B(0.5) C8(0.5) H8A(0.5) H8B(0.5)
5.a Secondary CH2 refined with riding coordinates:
 C5(H5A,H5B), C6(H6A,H6B), C7(H7A,H7B), C8(H8A,H8B)
5.b Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4)
;
_shelx_res_checksum              81717
_olex2_exptl_crystal_mounting_method
'Crystals were covered in polybutene oil under an inert atmosphere and transferred to a nylon loop placed under a stream of nitrogen gas'
_olex2_submission_special_instructions 'No special instructions were received'
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_oxdiff_exptl_absorpt_empirical_full_max 5.202
_oxdiff_exptl_absorpt_empirical_full_min 0.467