A Basic Strategy for Functionalization of Metal Cyclopentadienyl Complexes: Synthesis, Characterization, and Reactivity of Linear, Butterfly, and Cubic Chromium/Selenium Complexes Containing Functionally Substituted Cyclopentadienyl Ligands
Song, Li-Cheng; Cheng, Hua-Wei; Hu, Qing-Mei; Organometallics 23 (2004) 1072–; doi:10.1021/om034283q

data_4076264
_publ_section_title
;
 A Basic Strategy for Functionalization of Metal Cyclopentadienyl
 Complexes:&#x00A0; Synthesis, Characterization, and Reactivity of Linear,
 Butterfly, and Cubic Chromium/Selenium Complexes Containing Functionally
 Substituted Cyclopentadienyl Ligands
;
_journal_issue                   5
_journal_name_full               Organometallics
_journal_page_first              1072
_journal_paper_doi               10.1021/om034283q
_journal_volume                  23
_journal_year                    2004
_chemical_formula_sum            'C18 H14 Cr2 O8 Se'
_chemical_formula_weight         541.25
_chemical_name_systematic
; 
 ? 
;
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 96.548(11)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.787(6)
_cell_length_b                   8.057(5)
_cell_length_c                   23.448(14)
_cell_measurement_reflns_used    663
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      22.72
_cell_measurement_theta_min      3.16
_cell_volume                     2025(2)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.914
_diffrn_measured_fraction_theta_max 0.914
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0787
_diffrn_reflns_av_sigmaI/netI    0.0978
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            4419
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.16
_exptl_absorpt_coefficient_mu    2.913
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.409951
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_density_diffrn    1.776
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1072
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.993
_refine_diff_density_min         -0.457
_refine_diff_density_rms         0.122
_refine_ls_extinction_coef       0.0000(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     134
_refine_ls_number_reflns         1618
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.1007
_refine_ls_R_factor_gt           0.0683
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0833P)^2^+5.5475P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1628
_refine_ls_wR_factor_ref         0.1799
_reflns_number_gt                1148
_reflns_number_total             1618
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om034283qsi20031107_030839.cif
_cod_data_source_block           030609a
_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.

'_exptl_absorpt_correction_type' value 'MULTI-SCAN'
changed to 'multi-scan' 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_values 1715 2011-07-08 13:25:40Z adriana 

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 
;
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               4076264