Molecular and Electronic Structures by Design: Tuning Symmetrical and Unsymmetrical Linear Trichromium Chains
John F. Berry; F. Albert Cotton; Tongbu Lu; Carlos A. Murillo; Brian K. Roberts; Xiaoping Wang; Journal of the American Chemical Society 126 (2004) 7082–7096; doi:10.1021/ja049055h

data_4112636
_publ_contact_author_address
;  Laboratory for Molecular Structure and Bonding
   Dept. of Chemistry
   Texas A&M University, PO Box  30012
   College Station, TX 77842-3012, USA
;
_publ_contact_author_email       cotton@tamu.edu
_publ_contact_author_fax         '(979) 845 9351'
_publ_contact_author_name        'F. A. Cotton'
_publ_contact_author_phone       '(979) 845 4432'
_publ_section_title
;
 Molecular and Electronic Structures by Design: Tuning Symmetrical and
 Unsymmetrical Linear Trichromium Chains
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7082
_journal_page_last               7096
_journal_paper_doi               10.1021/ja049055h
_journal_volume                  126
_journal_year                    2004
_chemical_formula_moiety         'Cr3(C10H8N3)4Cl2, C6H6'
_chemical_formula_sum            'C46 H38 Cl2 Cr3 N12'
_chemical_formula_weight         985.78
_chemical_name_common            'Cr3(dpa)4Cl2, benzene'
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   18.634(5)
_cell_length_b                   29.357(17)
_cell_length_c                   16.142(3)
_cell_measurement_reflns_used    244
_cell_measurement_temperature    213(2)
_cell_measurement_theta_max      20.2
_cell_measurement_theta_min      4.7
_cell_volume                     8830(6)
_computing_cell_refinement       MADNES
_computing_data_collection       MADNES
_computing_data_reduction        PROCOR
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      213(2)
_diffrn_measured_fraction_theta_full 0.959
_diffrn_measured_fraction_theta_max 0.959
_diffrn_measurement_device_type  'Nonius FAST'
_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  0.0642
_diffrn_reflns_av_sigmaI/netI    0.0479
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -21
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            43255
_diffrn_reflns_theta_full        25.11
_diffrn_reflns_theta_max         25.11
_diffrn_reflns_theta_min         2.17
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.895
_exptl_absorpt_correction_T_max  0.8412
_exptl_absorpt_correction_T_min  0.7750
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'black green'
_exptl_crystal_density_diffrn    1.483
_exptl_crystal_description       'regular block'
_exptl_crystal_F_000             4032
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.472
_refine_diff_density_min         -0.470
_refine_diff_density_rms         0.087
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.04(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.140
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1116
_refine_ls_number_reflns         13996
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.140
_refine_ls_R_factor_all          0.0707
_refine_ls_R_factor_gt           0.0540
_refine_ls_shift/su_max          0.019
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0446P)^2^+22.1247P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1203
_refine_ls_wR_factor_ref         0.1333
_reflns_number_gt                12134
_reflns_number_total             13996
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja049055hsi20040409_043050_02.cif
_cod_data_source_block           1benzene
_cod_database_code               4112636