Remarkable Effects of Axial π* Coordination on the Cr-Cr Quadruple Bond in Dichromium Paddlewheel Complexes
F. Albert Cotton; Lee M. Daniels; Carlos A. Murillo; Isabel Pascual; Hong-Cai Zhou; Journal of the American Chemical Society 121 (1999) 6856–6861; doi:10.1021/ja9912675

data_4116454
_publ_section_title
;
 Remarkable Effects of Axial \p* Coordination on the Cr-Cr Quadruple Bond
 in Dichromium Paddlewheel Complexes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              6856
_journal_page_last               6861
_journal_paper_doi               10.1021/ja9912675
_journal_volume                  121
_journal_year                    1999
_chemical_compound_source        synthesized
_chemical_formula_moiety         'Cr2 (C11 H13 N2)4'
_chemical_formula_structural     'Cr2 (PhIP)4'
_chemical_formula_sum            'C44 H52 Cr2 N8'
_chemical_formula_weight         796.94
_chemical_name_systematic
; 
 Tetrakas(2-phenyliminopiperidinato)dichromium(II) 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                77.592(15)
_cell_angle_beta                 80.50(2)
_cell_angle_gamma                81.137(10)
_cell_formula_units_Z            2
_cell_length_a                   9.8649(7)
_cell_length_b                   10.1338(8)
_cell_length_c                   20.561(3)
_cell_measurement_reflns_used    250
_cell_measurement_temperature    213(2)
_cell_measurement_theta_max      20.8
_cell_measurement_theta_min      9.05
_cell_volume                     1964.9(4)
_computing_cell_refinement       'MADNES (Enraf-Nonius, 1989)'
_computing_data_collection       'MADNES (Enraf-Nonius, 1989)'
_computing_data_reduction        'PROCOR (Kabsch, 1988)'
_computing_molecular_graphics    'SHELXTL V.5 (Siemens, 1994)'
_computing_publication_material  CIFTAB
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXTL V.5 (Siemens, 1994)'
_diffrn_ambient_temperature      213(2)
_diffrn_measurement_device       'Nonius FAST area detector'
_diffrn_measurement_method       'Ellipsoid-mask fitting'
_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  0.0376
_diffrn_reflns_av_sigmaI/netI    0.0338
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
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_diffrn_reflns_theta_max         25.09
_diffrn_reflns_theta_min         2.22
_diffrn_standards_decay_%        none
_diffrn_standards_number         'none (area detector)'
_exptl_absorpt_coefficient_mu    0.596
_exptl_absorpt_correction_T_max  0.92
_exptl_absorpt_correction_T_min  0.71
_exptl_absorpt_correction_type   sortav
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.347
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    none
_exptl_crystal_description       needle
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.675
_refine_diff_density_min         -0.419
_refine_diff_density_rms         0.073
_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
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_refine_ls_number_parameters     487
_refine_ls_number_reflns         6548
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_refine_ls_restrained_S_all      1.135
_refine_ls_restrained_S_obs      1.114
_refine_ls_R_factor_all          0.0565
_refine_ls_R_factor_obs          0.0493
_refine_ls_shift/esd_max         -0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0430P)^2^+3.6087P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1262
_refine_ls_wR_factor_obs         0.1171
_reflns_number_observed          5912
_reflns_number_total             6563
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            ja9912675_5.cif
_cod_data_source_block           2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0430P)^2^+3.6087P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0430P)^2^+3.6087P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1964.9(3)
_cod_database_code               4116454