The strength of hydrogen bonding to metal-bound ligands can contribute to changes in the redox behaviour of metal centres.
Mareque Rivas, Juan C.; Hinchley, Sarah L.; Metteau, Laurent; Parsons, Simon; Dalton transactions (Cambridge, England : 2003)  (2006) 2316–2322; doi:10.1039/b516234c

data_7006994
_publ_section_title
;
 The strength of hydrogen bonding to metal-bound ligands can contribute
 to changes in the redox behaviour of metal centres.
;
_journal_issue                   19
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2316
_journal_page_last               2322
_journal_paper_doi               10.1039/b516234c
_journal_year                    2006
_chemical_compound_source        ' L. Matteau reation LM123c '
_chemical_formula_moiety         'C33 H45 Cl Cu N7 O3'
_chemical_formula_sum            'C33 H45 Cl Cu N7 O3'
_chemical_formula_weight         686.75
_chemical_name_systematic
;
?
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             05-10-19
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.1526(2)
_cell_length_b                   18.4259(3)
_cell_length_c                   18.6888(3)
_cell_measurement_reflns_used    6902
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      29.5
_cell_measurement_theta_min      2.5
_cell_volume                     3496.13(11)
_computing_cell_refinement       Saint
_computing_data_collection       Smart
_computing_data_reduction        Saint
_computing_molecular_graphics    XP
_computing_publication_material  'XCIF, PLATON'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker Smart Apex CCD'
_diffrn_measurement_method       'Omega and phi'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0579
_diffrn_reflns_av_sigmaI/netI    0.0460
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            61509
_diffrn_reflns_theta_full        30.51
_diffrn_reflns_theta_max         30.51
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    0.744
_exptl_absorpt_correction_T_max  0.840
_exptl_absorpt_correction_T_min  0.690
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   Sadabs
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.305
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1448
_exptl_crystal_recrystallization_method
;
Slow evaporation of MeCN soln.
;
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.25
_refine_diff_density_max         1.210
_refine_diff_density_min         -1.267
_refine_diff_density_rms         0.069
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.015(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    riding/refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     419
_refine_ls_number_reflns         10656
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0664
_refine_ls_R_factor_gt           0.0555
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0504P)^2^+2.0052P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1184
_refine_ls_wR_factor_ref         0.1230
_reflns_number_gt                9242
_reflns_number_total             10656
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b516234c.txt
_cod_data_source_block           jm0505
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multiscan' changed to
'multi-scan' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_atom_sites_solution_hydrogens' value 'geom/difmap' was changed to
'mixed'.

Automatic conversion script
Id: cif_fix_values 6452 2018-10-05 10:23:21Z andrius 
;
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               7006994