Crystallography Open Database

Information card for entry 2101270

Preview

Coordinates	2101270.cif
Original IUCr paper	HTML

Structure parameters

Chemical name	(E)-4,4'-dimethyl-1,1'-biindanylidene
Formula	C20 H20
Calculated formula	C20 H20
SMILES	Cc1cccc2c1CC/C2=C1/CCc2c1cccc2C
Title of publication	Unusually short ethylene bond and large amplitude torsional motion of (<i>E</i>)-stilbenes in crystals. X-ray crystallographic study of `stiff' stilbenes
Authors of publication	Ogawa, K.; Harada, J.; Tomoda, S.
Journal of publication	Acta Crystallographica Section B
Year of publication	1995
Journal volume	51
Journal issue	2
Pages of publication	240 - 248
a	5.225 ± 0.003 Å
b	5.42 ± 0.002 Å
c	24.26 ± 0.002 Å
α	90°
β	92.67 ± 0.02°
γ	90°
Cell volume	686.3 ± 0.5 Å³
Cell temperature	296 K
Ambient diffraction temperature	296 K
Number of distinct elements	2
Space group number	14
Hermann-Mauguin space group symbol	P 1 21/n 1
Hall space group symbol	-P 2yn
Residual factor for all reflections	0.046
Residual factor for significantly intense reflections	0.043
Weighted residual factors for all reflections	0.053
Weighted residual factors for significantly intense reflections	0.052
Goodness-of-fit parameter for all reflections	3.211
Goodness-of-fit parameter for significantly intense reflections	3.36
Diffraction radiation wavelength	1.54184 Å
Diffraction radiation type	CopperKα
Has coordinates	Yes
Has disorder	No
Has F_obs	No

Version history

Revision	Date	Message	Files
176768 (current)	2016-02-20	cif/2/ (antanas@kurmis) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in subrange 2/10.	2101270.cif
134621	2015-04-02	The 'cif_fix_values' script with an option '--fix-only-weighting-scheme' and 'cif_filter' script were run over CIF files which included an incorrect value of the data item '_refine_ls_weighting_scheme'. Read the log for more details. There were more than 18k CIF files with values to modify. Usually these incorrect values include comment with formulas, but values of this data item must be an enumerator. The script creates new data item '_refine_ls_weighting_details' to store these comments with formulas, and writes the enumerator 'calc' as a value of data item '_refine_ls_weighting_scheme'. There exists some exceptions in the script.	2101270.cif
91933	2013-12-28	cif/ (saulius@koala.ibt.lt) Adding DOIs that could be assigned unambiguously to the range 2x CIFs.	2101270.cif
32112	2012-02-03	cif/: committing an update of 45+ thous files, with information appended from the originals.	2101270.cif
26848	2011-09-28	cif/2/, hkl/2/, html/ Reorganising CIFs of the range 2* into the "prefix-directory" tree.	2101270.cif
26029	2011-09-17	cif/2/ Reverting changes of revision 25271: ( cd cif/2/; svn merge -r25271:25270 . ) The problem was that the reprocessed files from IUCr, although were more complete, "resurrected" data errors that were corrected in the previous recisions. The additional data that have been extracted during the reprocessing will have to be merged without overwriting the existing values in COD files, except some explicit and controlled cases (such as publication titles and chemical names).	2101270.cif
25271	2011-09-10	cif/2/ Adding reporocessed IUCr CIFs for the years 1980-2010. The CIFs now contain more complete bibliography, substance names, correctly unfolded text fields (using the CIF line unfolding protocol), explicitely set cell angles, and _cod_data_source_block fields.	2101270.cif
966	2010-01-30	cif/ Adding _cod_database_code tags to all COD entries. Adding tag description to the cif_cod.dic dictionary so that COD entries can be validated.	2101270.cif
340	2008-04-05	Fixing CIF files headers in the CIF files from the Acta-Cryst-B/ retrospecive deposition.	2101270.cif
326	2008-04-03	Adding all Acta Cryst. B, C, and E missing retrospective CIF files up to 2008 February, generated from the files that were automatically downloaded from the IUCr site.	2101270.cif