Bond distances are not always what they appear to be: discovery and un-discovery of the longest Cr(v)N triple bond
Song, Yu-Fei; Berry, John F.; Weyhermüller, Thomas; Bill, Eckhard; Dalton Transactions  (2008) 1864–1871; doi:10.1039/b717618j

data_7003625
_publ_section_title
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 Bond distances are not always what they appear to be: discovery and
 un-discovery of the longest Cr(v)&#xE002;N triple bond
;
_journal_issue                   14
_journal_name_full               'Dalton Transactions'
_journal_page_first              1864
_journal_page_last               1871
_journal_paper_doi               10.1039/b717618j
_journal_year                    2008
_chemical_formula_sum            'C18 H25 Cr N6 O5'
_chemical_formula_weight         457.44
_chemical_name_common            L3CrN3
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
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_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   13.2255(6)
_cell_length_b                   9.4894(4)
_cell_length_c                   30.5577(12)
_cell_measurement_temperature    100(2)
_cell_volume                     3835.1(3)
_computing_cell_refinement       'Nonius Collect Software'
_computing_data_collection       'Nonius Collect Software'
_computing_data_reduction        'Nonius Collect Software'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Nonius Kappa-CCD'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode, 50kV, 80 mA'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1017
_diffrn_reflns_av_sigmaI/netI    0.0591
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       42
_diffrn_reflns_limit_l_min       -42
_diffrn_reflns_number            38769
_diffrn_reflns_theta_full        30.00
_diffrn_reflns_theta_max         30.00
_diffrn_reflns_theta_min         3.08
_exptl_absorpt_coefficient_mu    0.643
_exptl_absorpt_correction_T_max  0.988
_exptl_absorpt_correction_T_min  0.935
_exptl_absorpt_correction_type   gaussian
_exptl_crystal_density_diffrn    1.585
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'transparent parallelepiped'
_exptl_crystal_F_000             1912
_exptl_crystal_size_max          0.18
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.410
_refine_diff_density_min         -0.456
_refine_diff_density_rms         0.087
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.108
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     272
_refine_ls_number_reflns         5586
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.108
_refine_ls_R_factor_all          0.0848
_refine_ls_R_factor_gt           0.0577
_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^)+(0.0259P)^2^+6.0778P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0986
_refine_ls_wR_factor_ref         0.1071
_reflns_number_gt                4275
_reflns_number_total             5586
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b717618j.txt
_cod_data_source_block           Cpd6
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Gaussian' changed to
'gaussian' according to
'/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7003625