#------------------------------------------------------------------------------
#$Date: 2011-09-10 04:16:28 +0100 (Sat, 10 Sep 2011) $
#$Revision: 25271 $
#$URL: svn://www.crystallography.net/cod/cif/2/2007273.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_2007273
loop_
_publ_author_name
'Boyle, T. J.'
'Scott, B. L.'
_publ_section_title
;
 Low-Temperature Structure of Lithium Bis(trimethylsilyl)amide
 Etherate, {[LiO(CH~2~CH~3~)~2~][N(Si(CH~3~)~3~)~2~]}~2~
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              IUC9800018
_journal_volume                  54
_journal_year                    1998
_chemical_formula_moiety         '[Li2 (C6 H18 N Si2 )2 (C4 H10 O )2 ]'
_chemical_formula_sum            'C20 H56 Li2 N2 O2 Si4'
_chemical_formula_weight         482.91
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           118
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P -4 -2n'
_symmetry_space_group_name_H-M   'P -4 n 2'
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.7390(10)
_cell_length_b                   9.7390(10)
_cell_length_c                   16.9210(10)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    198
_cell_measurement_theta_max      13.55
_cell_measurement_theta_min      13.50
_cell_volume                     1604.9(3)
_computing_cell_refinement       'XSCANS 2.10b (Siemens, 1994)'
_computing_data_collection       'XSCANS 2.10b (Siemens, 1994)'
_computing_data_reduction        'XSCANS 2.10b (Siemens, 1994)'
_computing_molecular_graphics    'SHELXTL PC 4.2/360 (Siemens, 1990)'
_computing_publication_material  'SHELXTL PC 4.2/360 (Siemens, 1990)'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      198
_diffrn_measurement_device       'Siemens P4/PC'
_diffrn_measurement_method       '\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  0.0181
_diffrn_reflns_av_sigmaI/netI    0.0294
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -1
_diffrn_reflns_number            1993
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.96
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.201
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    0.999
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'rectangular block'
_exptl_crystal_F_000             536
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.37
_exptl_crystal_size_min          0.33
_refine_diff_density_max         0.341
_refine_diff_density_min         -0.144
_refine_ls_abs_structure_details 'Flack (1983)'
_refine_ls_abs_structure_Flack   0.1(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.323
_refine_ls_goodness_of_fit_obs   1.326
_refine_ls_hydrogen_treatment    'H atoms not refined'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     70
_refine_ls_number_reflns         1424
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.323
_refine_ls_restrained_S_obs      1.326
_refine_ls_R_factor_all          0.0402
_refine_ls_R_factor_obs          0.0358
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_scheme
'calc w=1/[\s^2^(Fo^2^)+(0.0567P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_wR_factor_all         0.1063
_refine_ls_wR_factor_obs         0.1022
_reflns_number_observed          1315
_reflns_number_total             1424
_reflns_observed_criterion       >2sigma(I)
_[local]_cod_data_source_file    qc0002.cif
_[local]_cod_data_source_block   xr162
_cod_database_code               2007273
loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x, -y, z'
'y, -x, -z'
'-y, x, -z'
'x+1/2, -y+1/2, z+1/2'
'-x+1/2, y+1/2, z+1/2'
'y+1/2, x+1/2, -z+1/2'
'-y+1/2, -x+1/2, -z+1/2'
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si1 0.0416(4) 0.0389(3) 0.0259(3) -0.0055(3) -0.0019(3) -0.0029(3)
O1 0.0515(9) 0.0515(9) 0.0309(10) 0.0099(11) -0.0020(8) -0.0020(8)
N1 0.0388(14) 0.0356(14) 0.0233(12) -0.0045(10) 0.000 0.000
Li1 0.043(2) 0.043(2) 0.035(3) 0.004(2) -0.002(2) -0.002(2)
C1 0.047(2) 0.058(2) 0.056(2) -0.0072(12) -0.0098(13) -0.0070(13)
C2 0.061(2) 0.056(2) 0.0369(13) -0.0069(13) 0.0017(12) -0.0138(12)
C3 0.072(2) 0.0413(14) 0.0472(14) -0.0130(12) -0.0004(14) 0.0016(12)
C4 0.062(2) 0.065(2) 0.0430(13) 0.0088(14) 0.0067(13) -0.0046(14)
C5 0.066(2) 0.138(4) 0.079(2) -0.001(2) 0.014(2) -0.014(3)
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_thermal_displace_type
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_occupancy
_atom_site_type_symbol
Si1 0.91820(6) 0.37091(6) 0.10507(4) 0.0355(2) Uani d . 1 Si
O1 1.2298(2) 0.2702(2) 0.2500 0.0446(6) Uani d S 1 O
N1 1.0000 0.5000 0.15387(14) 0.0326(6) Uani d S 1 N
Li1 1.0891(4) 0.4109(4) 0.2500 0.0402(13) Uani d S 1 Li
C1 0.7372(3) 0.4175(3) 0.0769(2) 0.0538(7) Uani d . 1 C
H1A 0.6887(3) 0.4490(3) 0.1229(2) 0.081 Uiso calc R 1 H
H1B 0.6917(3) 0.3382(3) 0.0556(2) 0.081 Uiso calc R 1 H
H1C 0.7388(3) 0.4890(3) 0.0379(2) 0.081 Uiso calc R 1 H
C2 1.0041(3) 0.3109(3) 0.01151(15) 0.0512(7) Uani d . 1 C
H2A 1.0974(3) 0.2857(3) 0.02274(15) 0.077 Uiso calc R 1 H
H2B 1.0029(3) 0.3835(3) -0.02681(15) 0.077 Uiso calc R 1 H
H2C 0.9558(3) 0.2327(3) -0.00907(15) 0.077 Uiso calc R 1 H
C3 0.9048(3) 0.2108(3) 0.1675(2) 0.0534(7) Uani d . 1 C
H3A 0.9950(3) 0.1824(3) 0.1836(2) 0.080 Uiso calc R 1 H
H3B 0.8625(3) 0.1389(3) 0.1373(2) 0.080 Uiso calc R 1 H
H3C 0.8501(3) 0.2297(3) 0.2134(2) 0.080 Uiso calc R 1 H
C4 1.2933(3) 0.2227(3) 0.17892(15) 0.0568(7) Uani d . 1 C
H4A 1.2528(3) 0.2706(3) 0.13441(15) 0.068 Uiso calc R 1 H
H4B 1.2735(3) 0.1257(3) 0.17267(15) 0.068 Uiso calc R 1 H
C5 1.4452(4) 0.2428(5) 0.1767(3) 0.0947(14) Uani d . 1 C
H5A 1.4808(4) 0.2087(5) 0.1276(3) 0.142 Uiso calc R 1 H
H5B 1.4867(4) 0.1937(5) 0.2198(3) 0.142 Uiso calc R 1 H
H5C 1.4659(4) 0.3388(5) 0.1815(3) 0.142 Uiso calc R 1 H
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
O O 0.0106 0.0060 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Li Li -0.0003 0.0001 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_3
_geom_angle
_geom_angle_publ_flag
N1 Si1 C1 . . 112.53(10) yes
N1 Si1 C2 . . 115.42(11) ?
C1 Si1 C2 . . 106.15(13) ?
N1 Si1 C3 . . 111.77(11) ?
C1 Si1 C3 . . 106.03(14) ?
C2 Si1 C3 . . 104.15(14) ?
C4 O1 C4 . 8_665 115.3(3) yes
C4 O1 Li1 . . 122.35(14) yes
Si1 N1 Si1 . 2_765 121.96(15) ?
Si1 N1 Li1 . 2_765 120.17(5) ?
Si1 N1 Li1 . . 105.79(7) yes
Li1 N1 Li1 2_765 . 74.0(3) yes
O1 Li1 N1 . . 127.02(14) yes
N1 Li1 N1 7_545 . 106.0(3) yes
O1 C4 C5 . . 114.0(3) ?
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_site_symmetry_2
_geom_bond_distance
_geom_bond_publ_flag
Si1 N1 . 1.7020(13) yes
Si1 C1 . 1.882(3) ?
Si1 C2 . 1.884(3) ?
Si1 C3 . 1.888(3) ?
Si1 Li1 . 2.989(2) ?
O1 C4 . 1.430(3) ?
O1 Li1 . 1.938(6) yes
N1 Li1 . 2.037(4) yes
Li1 Li1 2_765 2.454(12) yes
N1 N1 7_545 3.253(4) yes
C4 C5 . 1.493(5) ?