Hidden in plain sight: commonly used copper N-heterocyclic carbene catalysts gain stabilization from anagostic Cu⋯H-C interactions.
Yan, Connly; Chang, Tieyan; Chen, Yu-Sheng; Paterson, Alexander L.; McElheny, Dan; Mankad, Neal P.; Chemical science 17 (2026) 4734–4743; doi:10.1039/d5sc09643j

data_1576766
_publ_section_title
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 Hidden in plain sight: commonly used copper N-heterocyclic carbene
 catalysts gain stabilization from anagostic Cu&#x22ef;H-C interactions.
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_journal_issue                   9
_journal_name_full               'Chemical science'
_journal_page_first              4734
_journal_page_last               4743
_journal_paper_doi               10.1039/d5sc09643j
_journal_volume                  17
_journal_year                    2026
_chemical_formula_moiety         'C11 H20 Cl Cu N2'
_chemical_formula_sum            'C11 H20 Cl Cu N2'
_chemical_formula_weight         279.293
_space_group_crystal_system      monoclinic
_space_group_IT_number           15
_space_group_name_Hall           '-C 2yc'
_space_group_name_H-M_alt        'C 1 2/c 1'
_symmetry_Int_Tables_number      15
_atom_sites_solution_primary     dual
_audit_creation_date             2025-06-25
_audit_creation_method
;
Olex2 1.5
(compiled 2024.02.16 svn.r378c4104 for OlexSys, GUI svn.r6928)
;
_audit_update_record
;
2025-10-10 deposited with the CCDC.	2026-01-08 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 107.253(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.8524(6)
_cell_length_b                   11.6698(6)
_cell_length_c                   11.0084(6)
_cell_measurement_reflns_used    9843
_cell_measurement_temperature    10
_cell_measurement_theta_max      26.819
_cell_measurement_theta_min      2.212
_cell_volume                     1331.43(12)
_computing_cell_refinement       'SAINT V8.38A (Bruker, 2018)'
_computing_data_reduction        'SAINT V8.38A (Bruker, 2018)'
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'olex2.refine 1.5 (Bourhis et al., 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      10
_diffrn_measured_fraction_theta_full 0.9809
_diffrn_measured_fraction_theta_max 0.9775
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.39995
_diffrn_reflns_av_R_equivalents  0.0638
_diffrn_reflns_av_unetI/netI     0.0239
_diffrn_reflns_Laue_measured_fraction_full 0.9809
_diffrn_reflns_Laue_measured_fraction_max 0.9775
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            118369
_diffrn_reflns_point_group_measured_fraction_full 0.9809
_diffrn_reflns_point_group_measured_fraction_max 0.9775
_diffrn_reflns_theta_full        13.8848
_diffrn_reflns_theta_max         25.18
_diffrn_reflns_theta_min         1.48
_diffrn_source_current           103.0
_diffrn_source_power             103.0
_diffrn_source_voltage           1000.0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.385
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8338
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2016/2 (Bruker,2016/2) was used for absorption correction.
wR2(int) was 0.1923 before and 0.0720 after correction.
The Ratio of minimum to maximum transmission is 0.8338.
The \l/2 correction factor is Not present.
;
_exptl_crystal_colour            white
_exptl_crystal_colour_primary    white
_exptl_crystal_density_diffrn    1.393
_exptl_crystal_description       plate
_exptl_crystal_F_000             585.160
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.2907
_refine_diff_density_min         -0.5201
_refine_diff_density_rms         0.1296
_refine_ls_d_res_high            0.4701
_refine_ls_d_res_low             7.7492
_refine_ls_goodness_of_fit_ref   0.9694
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     160
_refine_ls_number_reflns         6550
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.9694
_refine_ls_R_factor_all          0.0352
_refine_ls_R_factor_gt           0.0289
_refine_ls_shift/su_max          0.0004
_refine_ls_shift/su_mean         0.0000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0433P)^2^+0.7431P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0746
_refine_ls_wR_factor_ref         0.0808
_reflns_Friedel_coverage         0.0
_reflns_limit_h_max              22
_reflns_limit_h_min              -23
_reflns_limit_k_max              23
_reflns_limit_k_min              0
_reflns_limit_l_max              23
_reflns_limit_l_min              0
_reflns_number_gt                5453
_reflns_number_total             6550
_reflns_threshold_expression     I>=2u(I)
_cod_data_source_file            d5sc09643j3.cif
_cod_data_source_block           ItBuCuCl_m
_cod_database_code               1576766
_olex2_refinement_description
;
;
_olex2_refine_details
;
Refinement using NoSpherA2, an implementation of
NOn-SPHERical Atom-form-factors in Olex2.
Please cite:
F. Kleemiss et al. Chem. Sci. DOI 10.1039/D0SC05526C - 2021
NoSpherA2 implementation of HAR makes use of
tailor-made aspherical atomic form factors calculated
on-the-fly from a Hirshfeld-partitioned electron density (ED) - not from
spherical-atom form factors.

The ED is calculated from a gaussian basis set single determinant SCF
wavefunction - either Hartree-Fock or DFT using selected funtionals
 - for a fragment of the crystal.
This fragment can be embedded in an electrostatic crystal field by employing cluster charges
or modelled using implicit solvation models, depending on the software used.
The following options were used:
   SOFTWARE:       ORCA 5.0
   PARTITIONING:   NoSpherA2
   INT ACCURACY:   High
   METHOD:         B3LYP
   BASIS SET:      def2-SVP
   CHARGE:         0
   MULTIPLICITY:   1
   DATE:           2025-06-25_11-58-52
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_olex2_submission_special_instructions 'No special instructions were received'