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Information card for entry 2103720
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| Coordinates | 2103720.cif |
|---|---|
| Structure factors | 2103720.hkl |
| Original IUCr paper | HTML |
| External links | ChemSpider |
| Chemical name | 4-aminopyridinium . hydrogen squarate, 1:1 |
|---|---|
| Formula | C9 H8 N2 O4 |
| Calculated formula | C9 H8 N2 O4 |
| SMILES | OC1C(=O)C(=O)C=1[O-].[nH+]1ccc(N)cc1 |
| Title of publication | General rules for the packing of hydrogen-bonded crystals as derived from the analysis of squaric acid anions: aminoaromatic nitrogen base co-crystals |
| Authors of publication | Bertolasi, Valerio; Gilli, Paola; Ferretti, Valeria; Gilli, Gastone |
| Journal of publication | Acta Crystallographica Section B |
| Year of publication | 2001 |
| Journal volume | 57 |
| Journal issue | 4 |
| Pages of publication | 591 - 598 |
| a | 10.283 ± 0.003 Å |
| b | 7.068 ± 0.001 Å |
| c | 12.642 ± 0.002 Å |
| α | 90° |
| β | 97.95 ± 0.02° |
| γ | 90° |
| Cell volume | 910 ± 0.3 Å3 |
| Cell temperature | 296 ± 2 K |
| Ambient diffraction temperature | 296 ± 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 | 0.0468 |
| Residual factor for significantly intense reflections | 0.0379 |
| Weighted residual factors for all reflections included in the refinement | 0.1186 |
| Goodness-of-fit parameter for all reflections included in the refinement | 1.072 |
| Diffraction radiation wavelength | 0.71073 Å |
| Diffraction radiation type | MoKα |
| Has coordinates | Yes |
| Has disorder | No |
| Has Fobs | Yes |
| Revision | Date | Message | Files |
|---|---|---|---|
| 201972 (current) | 2017-10-13 | cif/ Marking COD entries in range 2/10 that are known to be related to ChemSpider entries using the _cod_related_entry data loop. |
2103720.cif 2103720.hkl |
| 180897 | 2016-04-02 | hkl/2/10/ (antanas@echidna) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in subrange 2/10/37. |
2103720.cif 2103720.hkl |
| 176768 | 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. |
2103720.cif 2103720.hkl |
| 91933 | 2013-12-28 | cif/ (saulius@koala.ibt.lt) Adding DOIs that could be assigned unambiguously to the range 2x CIFs. |
2103720.cif 2103720.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. | 2103720.cif 2103720.hkl |
| 32112 | 2012-02-03 | cif/: committing an update of 45+ thous files, with information appended from the originals. | 2103720.cif 2103720.hkl |
| 26848 | 2011-09-28 | cif/2/, hkl/2/, html/ Reorganising CIFs of the range 2* into the "prefix-directory" tree. |
2103720.cif 2103720.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). |
2103720.cif 2103720.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. |
2103720.cif 2103720.hkl |
| 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. |
2103720.cif 2103720.hkl |
| 691 | 2009-05-03 | Depositing the first portion of the Fobs data CIFs. These are CIFs from the Acta Cryst. journals, where the correspondence of the coordinate CIF and the Fobs CIF could be unambiguously determined automatically. In these files, cell constatnts match exctely, being equal with the floating point '==' operator in Perl. For the future depositions, such requirement is too strict, since sometimes cell constants in the coordinate and the Fobs files differ by a rounding error. Thus, a small tollerance will have to be introduced into the COD Fobs deposition scripts. |
2103720.cif 2103720.hkl |
| 397 | 2008-06-20 | Adding new CIF files deposited from Acta-Cryst-B-2001-2003/. |
2103720.cif |
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Users of the data should acknowledge the original authors of the
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