Crystallography Open Database

Information card for entry 2214203

Preview

Coordinates	2214203.cif
Structure factors	2214203.hkl
Original IUCr paper	HTML
External links	ChemSpider

Structure parameters

Common name	2-pyrazinic acid
Chemical name	pyrazine-2-carboxylic acid
Formula	C5 H4 N2 O2
Calculated formula	C5 H4 N2 O2
SMILES	O=C(O)c1nccnc1
Title of publication	The orthorhombic polymorph of pyrazine-2-carboxylic acid revisited
Authors of publication	Małecki, Jan Grzegorz; Kruszynski, Rafal; Kusz, Joachim
Journal of publication	Acta Crystallographica Section E
Year of publication	2007
Journal volume	63
Journal issue	7
Pages of publication	o3300 - o3300
a	11.3261 ± 0.0018 Å
b	6.318 ± 0.0012 Å
c	7.3389 ± 0.0011 Å
α	90°
β	90°
γ	90°
Cell volume	525.16 ± 0.15 Å³
Cell temperature	150 ± 1 K
Ambient diffraction temperature	150 ± 1 K
Number of distinct elements	4
Space group number	62
Hermann-Mauguin space group symbol	P n m a
Hall space group symbol	-P 2ac 2n
Residual factor for all reflections	0.0467
Residual factor for significantly intense reflections	0.0301
Weighted residual factors for significantly intense reflections	0.0775
Weighted residual factors for all reflections included in the refinement	0.0833
Goodness-of-fit parameter for all reflections included in the refinement	0.961
Diffraction radiation wavelength	0.71073 Å
Diffraction radiation type	MoKα
Has coordinates	Yes
Has disorder	No
Has F_obs	Yes

Version history

Revision	Date	Message	Files
201974 (current)	2017-10-13	cif/2/ Marking COD entries in range 2/21 that are known to be related to ChemSpider entries using the _cod_related_entry data loop.	2214203.cif 2214203.hkl
181062	2016-04-03	hkl/2/21/ (antanas@echidna) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in subrange 2/21/42.	2214203.cif 2214203.hkl
176787	2016-02-20	cif/2/ (antanas@kurmis) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in subrange 2/21.	2214203.cif 2214203.hkl
91933	2013-12-28	cif/ (saulius@koala.ibt.lt) Adding DOIs that could be assigned unambiguously to the range 2x CIFs.	2214203.cif 2214203.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.	2214203.cif 2214203.hkl
32112	2012-02-03	cif/: committing an update of 45+ thous files, with information appended from the originals.	2214203.cif 2214203.hkl
26848	2011-09-28	cif/2/, hkl/2/, html/ Reorganising CIFs of the range 2* into the "prefix-directory" tree.	2214203.cif 2214203.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).	2214203.cif 2214203.hkl
26025	2011-09-16	hkl/2/ Adding assigned Fobs files for the 1980-2010 IUCr data.	2214203.cif 2214203.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.	2214203.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.	2214203.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.	2214203.cif