N-Heterocyclic Carbenes and Charge Separation in Heterometallic s-Block Silylamides
Michael S. Hill; Gabriele Kociok-Köhn; Dugald J. MacDougall; Inorganic Chemistry 50 (2011) 5234–5241; doi:10.1021/ic2005634

data_4325334
_publ_section_title
;
 N-Heterocyclic Carbenes and Charge Separation in Heterometallic s-Block
 Silylamides
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              5234
_journal_page_last               5241
_journal_paper_doi               10.1021/ic2005634
_journal_volume                  50
_journal_year                    2011
_chemical_formula_moiety
'4(C54 H72 N4 Na), 4(C18 H54 N3 Si6 Sr), C7 H8 '
_chemical_formula_sum            'C295 H512 N28 Na4 Si24 Sr4'
_chemical_formula_weight         5567.93
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           54
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2a 2ac'
_symmetry_space_group_name_H-M   'P c c a'
_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                   15.9859(2)
_cell_length_b                   29.3812(5)
_cell_length_c                   37.6290(6)
_cell_measurement_reflns_used    129857
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.028
_cell_measurement_theta_min      2.910
_cell_volume                     17673.8(5)
_computing_cell_refinement       'HKL Scalepack (Otwinski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
;
 DENZO-SCALEPACK Z. Otwinowski and W. Minor, " 
 Processing of X-ray Diffraction Data Collected in Oscillation Mode ", 
 Methods in Enzymology, Volume 276: Macromolecular Crystallography, 
 part A, p.307-326, 1997,C.W. Carter, Jr. & R. M. Sweet, Eds., Academic Press.
;
_computing_molecular_graphics
'ORTEP3 for Windows - Farrugia, L. J. J. Appl. Crystallogr. 1997, 30, 565'
_computing_publication_material
;
 'WinGX publication routines, Farrugia, 
 L. J., J. Appl. Crystallogr., 1999, 32, 837-838
;
_computing_structure_refinement
;
 SHELXL97 -Program for Crystal Structure Analysis (Release 97-2). 
 Sheldrick, G.M., Institut f\"ur Anorganische Chemie der Universit\"at, 
 Tammanstrasse 4, D-3400 G\"ottingen, Germany, 1998 
;
_computing_structure_solution
; 
 SIR97- Altomare A., Burla M.C., Camalli M., Cascarano G.L., Giacovazzo C. , 
 Guagliardi A., Moliterni A.G.G., Polidori G.,Spagna R. 
 (1999) J. Appl. Cryst. 32, 115-119
;
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.977
_diffrn_measured_fraction_theta_max 0.977
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       '760 1.0 degree images with \w 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  0.0974
_diffrn_reflns_av_sigmaI/netI    0.1017
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       34
_diffrn_reflns_limit_k_min       -34
_diffrn_reflns_limit_l_max       44
_diffrn_reflns_limit_l_min       -44
_diffrn_reflns_number            109357
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         3.85
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.735
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.046
_exptl_crystal_description       block
_exptl_crystal_F_000             6020
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.541
_refine_diff_density_min         -0.475
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.015
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1069
_refine_ls_number_reflns         15249
_refine_ls_number_restraints     8
_refine_ls_restrained_S_all      1.015
_refine_ls_R_factor_all          0.1664
_refine_ls_R_factor_gt           0.0647
_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^)+(0.0612P)^2^+12.8024P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1304
_refine_ls_wR_factor_ref         0.1664
_reflns_number_gt                7376
_reflns_number_total             15249
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ic2005634_si_001_07.cif
_cod_data_source_block           compound7
_cod_database_code               4325334