Variable-Temperature X-ray Structural Investigation of {Fe[HC(3,5-Me2pz)3]2}(BF4)2 (pz = Pyrazolyl Ring): Observation of a Thermally Induced Spin State Change from All High Spin to an Equal High Spin-Low Spin Mixture, Concomitant with the Onset of Nonmerohedral Twinning
Daniel L. Reger; Christine A. Little; Victor G. Young; Maren Pink; Inorganic Chemistry 40 (2001) 2870–2874; doi:10.1021/ic010056+

data_4327582
_publ_section_title
;
 Variable-Temperature X-ray Structural Investigation of
 {Fe[HC(3,5-Me2pz)3]2}(BF4)2 (pz = Pyrazolyl Ring): Observation of a
 Thermally Induced Spin State Change from All High Spin to an Equal High
 Spin-Low Spin Mixture, Concomitant with the Onset of Nonmerohedral
 Twinning
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              2870
_journal_page_last               2874
_journal_paper_doi               10.1021/ic010056+
_journal_volume                  40
_journal_year                    2001
_chemical_formula_sum            'C32 H44 B2 F8 Fe N12'
_chemical_formula_weight         826.26
_chemical_name_common            d220ka
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 111.079(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   20.338(2)
_cell_length_b                   10.3318(10)
_cell_length_c                   19.6442(18)
_cell_measurement_temperature    173(2)
_cell_volume                     3851.6(6)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0436
_diffrn_reflns_av_sigmaI/netI    0.0402
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            14233
_diffrn_reflns_theta_full        25.03
_diffrn_reflns_theta_max         25.03
_diffrn_reflns_theta_min         2.15
_exptl_absorpt_coefficient_mu    0.472
_exptl_absorpt_correction_T_max  1.00
_exptl_absorpt_correction_T_min  0.81
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.425
_exptl_crystal_description       Euhedral
_exptl_crystal_F_000             1712
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.301
_refine_diff_density_min         -0.391
_refine_diff_density_rms         0.062
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     256
_refine_ls_number_reflns         3409
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0789
_refine_ls_R_factor_gt           0.0453
_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^)+(0.0347P)^2^+10.8324P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0994
_refine_ls_wR_factor_ref         0.1182
_reflns_number_gt                2332
_reflns_number_total             3409
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic0100562B_1.cif
_cod_data_source_block           d220ka
_cod_original_cell_volume        3851.5(6)
_cod_database_code               4327582