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#$Date: 2013-12-28 15:58:47 +0200 (Sat, 28 Dec 2013) $
#$Revision: 91933 $
#$URL: file:///home/coder/svn-repositories/cod/cif/2/00/19/2001978.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_2001978
loop_
_publ_author_name
'Fronczek, F. R.'
'Lickiss, P. D.'
_publ_section_title
;
 Structure of the highly crowded alkyne
 di[tris(trimethylsilyl)methyl]acetylene and the octasilane
 hexakis(trimethylsilyl)disilane
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              331
_journal_page_last               333
_journal_volume                  49
_journal_year                    1993
_chemical_formula_sum            'C22 H54 Si6'
_chemical_formula_weight         487.2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_cell_angle_alpha                68.207(13)
_cell_angle_beta                 74.837(14)
_cell_angle_gamma                59.858(9)
_cell_formula_units_Z            1
_cell_length_a                   9.0383(10)
_cell_length_b                   9.3596(9)
_cell_length_c                   11.855(3)
_cell_volume                     801.8(3)
_diffrn_radiation_type           Mo
_diffrn_radiation_wavelength     0.71073
_exptl_absorpt_coefficient_mu    0.262
_exptl_crystal_density_diffrn    1.009
_exptl_crystal_F_000             270
_[local]_cod_data_source_file    he0040.cif
_[local]_cod_data_source_block   he0040_structure_1_of_2
_cod_original_cell_volume        801.8(2)
_cod_database_code               2001978
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1 .40973(5) .64216(5) .22215(3)
Si2 .65915(5) .73653(4) .29251(4)
Si3 .78498(5) .35262(5) .29180(4)
C1 .52630(10) .51780(10) .44730(10)
C2 .59230(10) .56070(10) .31790(10)
C3 .2008(2) .7861(2) .2900(2)
C4 .3768(2) .4641(2) .2147(2)
C5 .4489(2) .7639(2) .0612(2)
C6 .7650(2) .6907(2) .4255(2)
C7 .8093(2) .7547(2) .1514(2)
C8 .4713(2) .9549(2) .2771(2)
C9 .8422(3) .3625(2) .1263(2)
C10 .9818(2) .3011(2) .3531(2)
C11 .7379(2) .1654(2) .3731(2)
H3A .207(3) .864(3) .291(2)
H3B .126(3) .819(3) .243(2)
H3C .162(3) .723(3) .350(2)
H4A .355(2) .397(2) .294(2)
H4B .285(2) .509(2) .174(2)
H4C .477(2) .387(2) .181(2)
H5A .552(2) .700(2) .023(2)
H5B .362(3) .792(2) .028(2)
H5C .443(2) .859(2) .065(2)
H6A .693(3) .702(3) .491(2)
H6B .854(3) .596(3) .434(2)
H6C .785(3) .767(2) .423(2)
H7A .909(2) .662(2) .161(2)
H7B .766(3) .774(2) .079(2)
H7C .829(3) .842(2) .152(2)
H8A .414(2) .995(2) .208(2)
H8B .393(2) .965(2) .345(2)
H8C .512(2) 1.030(2) .266(2)
H9A .767(3) .356(2) .106(2)
H9B .861(3) .444(2) .083(2)
H9C .936(3) .258(2) .123(2)
H10A 1.014(2) .383(2) .311(2)
H10B .969(2) .297(2) .438(2)
H10C 1.059(3) .214(2) .329(2)
H11A .738(3) .140(3) .449(2)
H11B .656(3) .166(3) .357(2)
H11C .825(3) .076(2) .369(2)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
Si1 C2 1.9150(10)
Si1 C3 1.866(2)
Si1 C4 1.870(2)
Si1 C5 1.871(2)
Si2 C2 1.923(2)
Si2 C6 1.860(2)
Si2 C7 1.871(2)
Si2 C8 1.8690(10)
Si3 C2 1.9190(10)
Si3 C9 1.873(2)
Si3 C10 1.865(2)
Si3 C11 1.860(2)
C1 C1' 1.199(2)
C1 C2 1.475(2)
_journal_paper_doi 10.1107/S0108270192002737