Crystallography Open Database
- COD Home
- Accessing COD Data
- Add Your Data
- Documentation
Information card for entry 2203987
Preview
| Coordinates | 2203987.cif |
|---|---|
| Structure factors | 2203987.hkl |
| Original IUCr paper | HTML |
| Common name | 4-methoxypyridinium-3-squarate |
|---|---|
| Chemical name | 2-(4-methoxypyridinio)-3,4-dioxocyclobut-1-en-1-olate |
| Formula | C10 H7 N O4 |
| Calculated formula | C10 H7 N O4 |
| SMILES | [n]1(ccc(OC)cc1)=C1C(=O)C(=O)C1=O |
| Title of publication | 4-Methoxypyridinium betaine of squaric acid |
| Authors of publication | T. Kolev; R. Wortmann; M. Spiteller; W. S. Sheldrick; H. Mayer-Figge |
| Journal of publication | Acta Crystallographica Section E |
| Year of publication | 2004 |
| Journal volume | 60 |
| Journal issue | 8 |
| Pages of publication | o1449 - o1450 |
| a | 4.581 ± 0.0009 Å |
| b | 11.744 ± 0.002 Å |
| c | 16.594 ± 0.003 Å |
| α | 90° |
| β | 96.69 ± 0.03° |
| γ | 90° |
| Cell volume | 886.7 ± 0.3 Å3 |
| Cell temperature | 293 ± 2 K |
| Ambient diffraction temperature | 293 ± 2 K |
| Number of distinct elements | 4 |
| Space group number | 14 |
| Hermann-Mauguin space group symbol | P 1 21/c 1 |
| Hall space group symbol | -P 2ybc |
| Residual factor for all reflections | 0.0785 |
| Residual factor for significantly intense reflections | 0.0441 |
| Weighted residual factors for significantly intense reflections | 0.0929 |
| Weighted residual factors for all reflections included in the refinement | 0.1073 |
| Goodness-of-fit parameter for all reflections included in the refinement | 1.026 |
| Diffraction radiation wavelength | 0.71073 Å |
| Diffraction radiation type | MoKα |
| Has coordinates | Yes |
| Has disorder | No |
| Has Fobs | Yes |
| Revision | Date | Message | Files |
|---|---|---|---|
| 180959 (current) | 2016-04-03 | hkl/2/20/ (antanas@echidna) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in subrange 2/20/39. |
2203987.cif 2203987.hkl |
| 176774 | 2016-02-20 | cif/2/ (antanas@kurmis) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in subrange 2/20. |
2203987.cif 2203987.hkl |
| 91933 | 2013-12-28 | cif/ (saulius@koala.ibt.lt) Adding DOIs that could be assigned unambiguously to the range 2x CIFs. |
2203987.cif 2203987.hkl |
| 88064 | 2013-08-29 | Adding _cod_database_fobs_code data item to all COD CIFs that have Fobs deposited and did not have this data item yet. | 2203987.cif 2203987.hkl |
| 32112 | 2012-02-03 | cif/: committing an update of 45+ thous files, with information appended from the originals. | 2203987.cif 2203987.hkl |
| 26848 | 2011-09-28 | cif/2/, hkl/2/, html/ Reorganising CIFs of the range 2* into the "prefix-directory" tree. |
2203987.cif 2203987.hkl |
| 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). |
2203987.cif 2203987.hkl |
| 26025 | 2011-09-16 | hkl/2/ Adding assigned Fobs files for the 1980-2010 IUCr data. |
2203987.cif 2203987.hkl |
| 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. |
2203987.cif |
| 17004 | 2011-03-31 | cif/ Commiting CIFs, that were updated with the 'cif_fix_values' script, using options '--fix-misspelled replacement_values.lst', '--fix-temperature' and '--fix-enums' with built-in table of enum values. The following cmd was used: > (set -x; find ? -name \*.cif | sort | xargs -i sh -c 'if !( > cif_fix_values --fix-misspelled ~/../inputs/replacament_values.lst {} | > cif_filter --add-cif-header {} | > sponge {} ) 2>&1 | grep NOTE; then svn revert {}; > fi' ) & |
2203987.cif |
| 5310 | 2011-01-02 | cif/ Running cif_fix_enum with the core CIF dictionary on COD ranges 2, 8 and 9. Range 9 remained unchanged, and in ranges 2 and 8 there were 17309 modified files, most changes were fixes enumerator case. |
2203987.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. |
2203987.cif |
| 853 | 2009-11-16 | cif/ Reconstructing spacegroup designators from the symmetry operators were possible. The comands used can be found in the log file reformat-spacegroups-2009.11.14.log committed with the current revision. Only lines that contained spacegroup designators were changed, and all files pass vcif test after the conversion. |
2203987.cif |
| 321 | 2008-03-30 | Changing the COD CIF files header (comments) in all files that were recently deposited from the IUCr autodownloaded sources to the text agreed with IUCr. |
2203987.cif |
| 101 | 2008-02-08 | Renaming the '_[local]_cod_original_file' tag into '_[local]_cod_data_source_file'. This reflects better the actual usage of the mentioned files -- they were used for data extraction, but not as originals for verbatim copying. |
2203987.cif |
| 87 | 2008-02-04 | Adding CIF files from ActaE2004-Issues-4-12/ (1465 files). |
2203987.cif |
All data in the COD and the database itself are dedicated to the
public domain and licensed under the
CC0
License
.
Users of the data should acknowledge the original authors of the
structural data.