In Search of a Versatile Pathway toansa-Chromocene Complexes. Synthesis and Characterization of the Highly Unstableansa-Chromocene Carbonyl Complex Me2C(C5H4)2CrCO
Perrotin, Philippe; Shapiro, Pamela J.; Williams, Mark; Twamley, Brendan; Organometallics 26 (2007) 1823–; doi:10.1021/om061136u

data_4072917
_publ_section_title
;
 In Search of a Versatile Pathway toansa-Chromocene Complexes. Synthesis
 and Characterization of the Highly Unstableansa-Chromocene Carbonyl
 Complex Me2C(C5H4)2CrCO
;
_journal_issue                   7
_journal_name_full               Organometallics
_journal_page_first              1823
_journal_paper_doi               10.1021/om061136u
_journal_volume                  26
_journal_year                    2007
_chemical_formula_moiety         'C21 H30 Mg O2'
_chemical_formula_sum            'C21 H30 Mg O2'
_chemical_formula_weight         338.76
_chemical_name_common            Me2CCp2Mg.2THF
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 90.894(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.3948(8)
_cell_length_b                   8.3443(5)
_cell_length_c                   15.8022(9)
_cell_measurement_reflns_used    2605
_cell_measurement_temperature    185(2)
_cell_measurement_theta_max      21.62
_cell_measurement_theta_min      2.57
_cell_volume                     1897.84(19)
_computing_cell_refinement       'Bruker SAINT+ v. 6.45a'
_computing_data_collection       'Bruker SMART v. 5.626'
_computing_data_reduction        'Bruker SAINT+ v. 6.45a'
_computing_molecular_graphics    'XP, Bruker SHELXTL v. 6.12'
_computing_publication_material  'XCIF, Bruker SHELXTL v. 6.12'
_computing_structure_refinement  'XL, Bruker SHELXTL v. 6.12'
_computing_structure_solution    'XS, Bruker SHELXTL v. 6.12'
_diffrn_ambient_temperature      185(2)
_diffrn_detector_area_resol_mean 8.3
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker/Siemens SMART APEX'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'normal-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1011
_diffrn_reflns_av_sigmaI/netI    0.0648
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            21376
_diffrn_reflns_theta_full        25.27
_diffrn_reflns_theta_max         25.27
_diffrn_reflns_theta_min         2.58
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_T_max  0.9949
_exptl_absorpt_correction_T_min  0.9628
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS; Bruker, 2004'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.186
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.37
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.286
_refine_diff_density_min         -0.249
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.003
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     212
_refine_ls_number_reflns         3440
_refine_ls_number_restraints     24
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.1289
_refine_ls_R_factor_gt           0.0673
_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^)+(0.0538P)^2^+2.2031P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1385
_refine_ls_wR_factor_ref         0.1652
_reflns_number_gt                1978
_reflns_number_total             3440
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            om061136usi20061217_102458.cif
_cod_data_source_block           bt772
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4072917