A convenient route to silyl linked bis(amidinate) ligands and synthesis of group(I) metal derivatives.
Bai, Sheng-Di; Guo, Jian-Ping; Liu, Dian-Sheng; Dalton transactions (Cambridge, England : 2003)  (2006) 2244–2250; doi:10.1039/b516283a

data_7006997
_publ_section_title
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 A convenient route to silyl linked bis(amidinate) ligands and
 synthesis of group(I) metal derivatives.
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_journal_issue                   18
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2244
_journal_page_last               2250
_journal_paper_doi               10.1039/b516283a
_journal_year                    2006
_chemical_formula_sum            'C48 H68 Li4 N8 Si2'
_chemical_formula_weight         841.04
_chemical_name_systematic
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?
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
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_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.050(2)
_cell_length_b                   16.884(3)
_cell_length_c                   21.878(3)
_cell_measurement_reflns_used    5701
_cell_measurement_temperature    203(2)
_cell_measurement_theta_max      21.254
_cell_measurement_theta_min      2.413
_cell_volume                     5189.9(14)
_computing_cell_refinement       SAINT
_computing_data_collection       Smart
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXL-97 (Sheldrick, 1997)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      203(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Smart CCD'
_diffrn_measurement_method       '\w scan'
_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  0.0468
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_diffrn_reflns_limit_h_min       -16
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_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            20639
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.52
_diffrn_standards_decay_%        3.72
_exptl_absorpt_coefficient_mu    0.106
_exptl_absorpt_correction_T_max  0.9587
_exptl_absorpt_correction_T_min  0.7133
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.076
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             1808
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.534
_refine_diff_density_min         -0.419
_refine_diff_density_rms         0.056
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.08(18)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.103
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     559
_refine_ls_number_reflns         6917
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.103
_refine_ls_R_factor_all          0.0810
_refine_ls_R_factor_gt           0.0741
_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^)+(0.0834P)^2^+3.8535P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1712
_refine_ls_wR_factor_ref         0.1757
_reflns_number_gt                6319
_reflns_number_total             6917
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b516283a.txt
_cod_data_source_block           s094p
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_original_cell_volume        5189.8(14)
_cod_original_sg_symbol_H-M      Pna2(1)
_cod_database_code               7006997