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_4112644
_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)4Br2, CH2Cl2'
_chemical_formula_sum            'C41 H34 Br2 Cl2 Cr3 N12'
_chemical_formula_weight         1081.52
_chemical_name_common            'Cr3(dpa)4Br2, CH2Cl2'
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           34
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2 -2n'
_symmetry_space_group_name_H-M   'P n n 2'
_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            2
_cell_length_a                   13.0976(13)
_cell_length_b                   14.2026(14)
_cell_length_c                   11.4101(11)
_cell_measurement_reflns_used    6965
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      2.29
_cell_volume                     2122.5(4)
_computing_cell_refinement       SAINT
_computing_data_collection       SMART
_computing_data_reduction        SAINT
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      213(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART 1000'
_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  0.0269
_diffrn_reflns_av_sigmaI/netI    0.0390
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            12785
_diffrn_reflns_theta_full        27.51
_diffrn_reflns_theta_max         27.51
_diffrn_reflns_theta_min         2.12
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    2.810
_exptl_absorpt_correction_T_max  0.6620
_exptl_absorpt_correction_T_min  0.5067
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            green
_exptl_crystal_density_diffrn    1.692
_exptl_crystal_description       block
_exptl_crystal_F_000             1080
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.542
_refine_diff_density_min         -0.533
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.003(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     284
_refine_ls_number_reflns         4536
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0319
_refine_ls_R_factor_gt           0.0262
_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^)+(0.0319P)^2^+0.1542P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0644
_refine_ls_wR_factor_ref         0.0673
_reflns_number_gt                4054
_reflns_number_total             4536
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            ja049055hsi20040409_043050_10.cif
_cod_data_source_block           6CH2Cl2
_cod_database_code               4112644