Low valent chromium complexes bearing N,O-chelating pyridyl-enolate ligands [OC(Bu^t^)(=2-CHN~5~H~3~Me-x)]^-^ (x = 3-6)
Gibson, Vernon C.; Newton, Claire; Redshaw, Carl; Solan, Gregory A.; White, Andrew J. P.; Williams, David J.; Dalton Transactions  (2003) 4612–4617; doi:10.1039/b308881m

data_7013483
_publ_section_title
;
 Low valent chromium complexes bearing N,O-chelating pyridyl-enolate
 ligands [OC(Bu^t^)(=2-CHN~5~H~3~Me-x)]^-^ (x = 3-6)
;
_journal_coden_ASTM              DTARAF
_journal_issue                   24
_journal_name_full               'Dalton Transactions'
_journal_page_first              4612
_journal_page_last               4617
_journal_paper_doi               10.1039/b308881m
_journal_year                    2003
_chemical_formula_sum            'C24 H32 Cr N2 O2'
_chemical_formula_weight         432.52
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 93.894(15)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   19.883(4)
_cell_length_b                   10.2348(13)
_cell_length_c                   11.578(2)
_cell_measurement_reflns_used    28
_cell_measurement_temperature    183(2)
_cell_measurement_theta_max      12.47
_cell_measurement_theta_min      5.32
_cell_volume                     2350.7(7)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      183(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w scans'
_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  0.0182
_diffrn_reflns_av_sigmaI/netI    0.0396
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            2106
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.24
_diffrn_standards_decay_%        4.68
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.507
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Orange/red
_exptl_crystal_density_diffrn    1.222
_exptl_crystal_description       prisms
_exptl_crystal_F_000             920
_exptl_crystal_size_max          0.57
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.27
_refine_diff_density_max         0.719
_refine_diff_density_min         -0.745
_refine_diff_density_rms         0.082
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.052
_refine_ls_goodness_of_fit_obs   1.073
_refine_ls_matrix_type           full
_refine_ls_number_parameters     133
_refine_ls_number_reflns         2045
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_restrained_S_obs      1.073
_refine_ls_R_factor_all          0.0632
_refine_ls_R_factor_obs          0.0531
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1101P)^2^+0.7950P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1518
_refine_ls_wR_factor_obs         0.1418
_reflns_number_observed          1733
_reflns_number_total             2045
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b308881m.txt
_cod_data_source_block           Compound_1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.1101P)^2^+0.7950P] 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^)+(0.1101P)^2^+0.7950P] 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        2350.7(6)
_cod_original_sg_symbol_H-M      C2/c
_cod_original_formula_sum        'C24 H32 N2 O2 Cr'
_cod_database_code               7013483