A crystallographic and EPR study of the fluxional Cu(II) ion in [CuL2][BF4]2 (L = 2,6-dipyrazol-1-ylpyridine)
Nayan K. Solanki; Michael A. Leech; Eric J. L. McInnes; Frank E. Mabbs; Judith A. K. Howard; Colin A. Kilner; Jeremy M. Rawson; Malcolm A. Halcrow; J. Chem. Soc., Dalton Trans.  (2002) 1295–1301; doi:10.1039/b109201b

data_7011227
_publ_section_title
;
 A crystallographic and EPR study of the fluxional Cu(II) ion in
 [CuL2][BF4]2 (L = 2,6-dipyrazol-1-ylpyridine)
;
_journal_issue                   7
_journal_name_full               'J. Chem. Soc., Dalton Trans.'
_journal_page_first              1295
_journal_page_last               1301
_journal_paper_doi               10.1039/b109201b
_journal_year                    2002
_chemical_formula_moiety         '[C22 H18 Cu N10] 2[B F4]'
_chemical_formula_sum            'C22 H18 B2 Cu F8 N10'
_chemical_formula_weight         659.62
_chemical_name_systematic
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Bis-[2,6-di-(pyrazol-1-yl)pyridine]copper(II) ditetrafluoroborate
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 96.1310(11)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.4981(2)
_cell_length_b                   8.5663(2)
_cell_length_c                   18.9448(5)
_cell_measurement_reflns_used    14125
_cell_measurement_temperature    300(2)
_cell_measurement_theta_max      27.46
_cell_measurement_theta_min      3.06
_cell_volume                     1371.24(6)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1996)'
_computing_data_collection       'COLLECT (Nonius, 1999)'
_computing_data_reduction        'DENZO-SMN (Otwinowski & Minor, 1996)'
_computing_molecular_graphics    'ORTEX (McArdle, 1995)'
_computing_publication_material  'local program'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      300(2)
_diffrn_detector_area_resol_mean 9.091
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Nonius KappaCCD diffractometer'
_diffrn_measurement_method       'Area detector scans'
_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  0.0380
_diffrn_reflns_av_sigmaI/netI    0.0507
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            14125
_diffrn_reflns_theta_full        27.46
_diffrn_reflns_theta_max         27.46
_diffrn_reflns_theta_min         3.06
_exptl_absorpt_coefficient_mu    0.885
_exptl_absorpt_correction_T_max  0.9571
_exptl_absorpt_correction_T_min  0.8429
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Using multiple and symmetry-related data measurements via the program SORTAV
See R.H. Blessing, Acta Cryst (1995), A51, 33-38 
;
_exptl_crystal_colour            Green
_exptl_crystal_density_diffrn    1.598
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             662
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.343
_refine_diff_density_min         -0.327
_refine_diff_density_rms         0.056
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.018(15)
_refine_ls_extinction_coef       0.034(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     427
_refine_ls_number_reflns         5522
_refine_ls_number_restraints     68
_refine_ls_restrained_S_all      1.082
_refine_ls_R_factor_all          0.0573
_refine_ls_R_factor_gt           0.0454
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0658P)^2^+0.3575P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1141
_refine_ls_wR_factor_ref         0.1235
_reflns_number_gt                4662
_reflns_number_total             5522
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b109201b.txt
_cod_data_source_block           nksvt300
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7011227