Oligonuclear Fe complexes (Fe, Fe4, Fe6, Fe9) derived from tritopic pyridine bis-hydrazone ligands-structural, magnetic, and Mössbauer studies.
Anwar, Muhammad U.; Dawe, Louise N.; Parsons, Stewart R.; Tandon, Santokh S.; Thompson, Laurence K.; Dey, Subrata K.; Mereacre, Valeriu; Reiff, William M.; Bunge, Scott D.; Inorganic chemistry 53 (2014) 4655–4668; doi:10.1021/ic500348k

data_4350665
_publ_section_title
;
 Oligonuclear Fe complexes (Fe, Fe4, Fe6, Fe9) derived from tritopic
 pyridine bis-hydrazone ligands-structural, magnetic, and M\"ossbauer
 studies.
;
_journal_issue                   9
_journal_name_full               'Inorganic chemistry'
_journal_page_first              4655
_journal_page_last               4668
_journal_paper_doi               10.1021/ic500348k
_journal_volume                  53
_journal_year                    2014
_chemical_formula_moiety         'C114 H84 Cl6 Fe7.47 N54 O12, 6(Cl O4)'
_chemical_formula_sum            'C114 H84 Cl12 Fe7.47 N54 O36'
_chemical_formula_weight         3628.21
_space_group_crystal_system      tetragonal
_space_group_IT_number           86
_space_group_name_Hall           '-P 4bc'
_space_group_name_H-M_alt        'P 42/n :2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2013-09-06
_audit_creation_method
;
  Olex2 1.2
  (compiled Apr 23 2013 17:59:47, GUI svn.r4466)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   20.2231(8)
_cell_length_b                   20.2231(8)
_cell_length_c                   22.415(2)
_cell_measurement_reflns_used    5485
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      25.286
_cell_measurement_theta_min      2.309
_cell_volume                     9167.1(10)
_computing_cell_refinement       'SAINT (Siemens ,1995)'
_computing_data_collection       'SMART (Siemens, 1993)'
_computing_data_reduction        'SAINT (Siemens ,1995)'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement
;
SHELXL-2013, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_computing_structure_solution
;
SHELXS, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0694
_diffrn_reflns_av_unetI/netI     0.0372
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            69540
_diffrn_reflns_point_group_measured_fraction_full 0.998
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.45
_diffrn_reflns_theta_min         0.91
_exptl_absorpt_coefficient_mu    0.824
_exptl_absorpt_correction_T_max  0.7489
_exptl_absorpt_correction_T_min  0.6699
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Siemens, 1996)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.314
_exptl_crystal_description       prism
_exptl_crystal_F_000             3664.3
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.31
_refine_diff_density_max         1.084
_refine_diff_density_min         -0.429
_refine_diff_density_rms         0.122
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     532
_refine_ls_number_reflns         9413
_refine_ls_number_restraints     18
_refine_ls_restrained_S_all      1.063
_refine_ls_R_factor_all          0.1102
_refine_ls_R_factor_gt           0.0763
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1701P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2237
_refine_ls_wR_factor_ref         0.2484
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6115
_reflns_number_total             9413
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ic500348k_si_002.cif
_cod_data_source_block           Complex_4b
_cod_original_cell_volume        9167.1(11)
_cod_original_sg_symbol_H-M      'P 42/n'
_cod_database_code               4350665
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All N(H,H) groups
2. Uiso/Uaniso restraints and constraints
Cl3 \\sim O7 \\sim O6 \\sim O5: within 1.7A with sigma of 0.004 and sigma 
for terminal atoms of 0.008
3. Others
 Fixed Sof: Cl3(0.5) O4(0.5) O5(0.5) O6(0.5) O7(0.5)
4.a Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C9(H9), C11(H11), C13(H13), C14(H14),
 C15(H15), C16(H16), C20(H20), C21(H21), C22(H22), C23(H23), C28(H28)
4.b X=CH2 refined with riding coordinates:
 N2(H2A,H2B), N7(H7A,H7B), N11(H11A,H11B)
;
_smtbx_masks_special_details
;
The OLEX2 solvent masking procedure was applied to recover 590 electrons per 
unit cell in one void (total volume 2772.8 ^A^3) that is 295 electrons 
per formula unit. The application of a solvent mask gave a significant 
improvement in the data statistics, however, this report is only intended 
to support the gross connectivity in the core of the structure.  Charge
balance has not been achieved and there is some question about the identity
of the atom at the site identified as Fe2, which refined to an occupancy of
0.617(3).
;