Reactions of Low-Valent Titanocene(II) Fragments withtrans-4,4′-Azobispyridine (RNNR, R = C5H4N): Formation of Tetranuclear Molecular Squares bytrans−cisIsomerization
Theilmann, Oliver; Saak, Wolfgang; Haase, Detlev; Beckhaus, Rüdiger; Organometallics 28 (2009) 2799–; doi:10.1021/om801123k

data_4068837
_publ_section_title
;
 Reactions of Low-Valent Titanocene(II) Fragments
 withtrans-4,4&#x2032;-Azobispyridine (RN&#xE5FB;NR, R = C5H4N): Formation
 of Tetranuclear Molecular Squares bytrans&#x2212;cisIsomerization
;
_journal_issue                   9
_journal_name_full               Organometallics
_journal_page_first              2799
_journal_paper_doi               10.1021/om801123k
_journal_volume                  28
_journal_year                    2009
_chemical_formula_sum            'C16 H16 N4'
_chemical_formula_weight         264.33
_space_group_IT_number           88
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  '-I 4ad'
_symmetry_space_group_name_H-M   'I 41/a :2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   12.8618(11)
_cell_length_b                   12.8618(11)
_cell_length_c                   17.9097(17)
_cell_measurement_temperature    153(2)
_cell_volume                     2962.7(5)
_computing_cell_refinement       'IPDS (Stoe, 1999)'
_computing_data_collection       'IPDS (Stoe, 1999)'
_computing_data_reduction        'XRED (Stoe, 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia,1997)'
_computing_publication_material  'SHELX-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      153(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Stoe IPDS'
_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  0.0682
_diffrn_reflns_av_sigmaI/netI    0.0555
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            14083
_diffrn_reflns_theta_full        26.20
_diffrn_reflns_theta_max         26.20
_diffrn_reflns_theta_min         3.17
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.9891
_exptl_absorpt_correction_T_min  0.9854
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.185
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1120
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.131
_refine_diff_density_min         -0.110
_refine_diff_density_rms         0.021
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.731
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     123
_refine_ls_number_reflns         1480
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.731
_refine_ls_R_factor_all          0.0634
_refine_ls_R_factor_gt           0.0260
_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^)+(0.0204P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0423
_refine_ls_wR_factor_ref         0.0465
_reflns_number_gt                834
_reflns_number_total             1480
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om801123k_si_005.cif
_cod_data_source_block           OTH019
_cod_original_sg_symbol_H-M      I41/a
_cod_database_code               4068837