Narrow Band Gap Observed in a Molecular Ferroelastic: Ferrocenium Tetrachloroferrate.
Zhang, Han-Yue; Hu, Chun-Li; Hu, Zhao-Bo; Mao, Jiang-Gao; Song, You; Xiong, Ren-Gen; Journal of the American Chemical Society  (2020) –; doi:10.1021/jacs.9b13446

data_4134073
_publ_section_title
;
 Narrow Band Gap Observed in a Molecular Ferroelastic: Ferrocenium
 Tetrachloroferrate.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.9b13446
_journal_year                    2020
_chemical_formula_moiety         'C10 H10 Fe, Cl4 Fe'
_chemical_formula_sum            'C10 H10 Cl4 Fe2'
_chemical_formula_weight         383.68
_space_group_crystal_system      orthorhombic
_space_group_IT_number           62
_space_group_name_Hall           '-P 2ac 2n'
_space_group_name_H-M_alt        'P n m a'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   13.8181(13)
_cell_length_b                   8.7371(9)
_cell_length_c                   11.9538(18)
_cell_measurement_reflns_used    1502
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.4860
_cell_measurement_theta_min      2.9330
_cell_volume                     1443.2(3)
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'XtaLAB Synergy R, DW system, HyPix'
_diffrn_measurement_method       'four-circle diffractometer'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0860
_diffrn_reflns_av_unetI/netI     0.0617
_diffrn_reflns_Laue_measured_fraction_full 0.993
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            5254
_diffrn_reflns_point_group_measured_fraction_full 0.993
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.495
_diffrn_reflns_theta_min         2.888
_exptl_absorpt_coefficient_mu    2.720
_exptl_crystal_colour            Black
_exptl_crystal_density_diffrn    1.766
_exptl_crystal_description       Block
_exptl_crystal_F_000             760.0
_refine_diff_density_max         1.335
_refine_diff_density_min         -0.552
_refine_diff_density_rms         0.181
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     82
_refine_ls_number_reflns         1431
_refine_ls_number_restraints     66
_refine_ls_restrained_S_all      1.084
_refine_ls_R_factor_all          0.1119
_refine_ls_R_factor_gt           0.0882
_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^)+(0.1390P)^2^+2.7015P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2354
_refine_ls_wR_factor_ref         0.2507
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1011
_reflns_number_total             1431
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja9b13446_si_003.cif
_cod_data_source_block           Pnma-2
_cod_database_code               4134073
_shelx_shelxl_version_number     2014/7
_shelx_res_checksum              19477
_shelx_hkl_checksum              2693