Limits...
Crystal structure of ammonium bis-(pyridine-2,6-di-carboxyl-ato-κ(3) O,N,O')chromate(III) from synchrotron data.

Moon D, Choi JH - Acta Crystallogr E Crystallogr Commun (2015)

Bottom Line: The structure of the title compound, (NH4)[Cr(pydc)2] (pydc is pyridine-2,6-di-carboxyl-ate, C7H3NO4), has been determined from synchrotron data.The Cr(III) cation is coordinated by four O atoms and the two N atoms of two meridional pydc ligands, displaying a distorted octa-hedral geometry.The Cr-N and Cr-O bond lengths are 1.9727 (15) and 1.9889 (9) Å, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Republic of Korea.

ABSTRACT
The structure of the title compound, (NH4)[Cr(pydc)2] (pydc is pyridine-2,6-di-carboxyl-ate, C7H3NO4), has been determined from synchrotron data. The Cr(III) ion and the N atom of the ammonium cation are located on a crystallographic fourfold rotoinversion axis (-4). The Cr(III) cation is coordinated by four O atoms and the two N atoms of two meridional pydc ligands, displaying a distorted octa-hedral geometry. The Cr-N and Cr-O bond lengths are 1.9727 (15) and 1.9889 (9) Å, respectively. The crystal structure is stabilized by inter-molecular hydrogen bonds involving the N-H groups of the ammonium cation and pyridine C-H groups as donors and the non-coordinating carbonyl O atoms as acceptors.

No MeSH data available.


Related in: MedlinePlus

The mol­ecular structure of (NH4)[Cr(pydc)2], showing the atom-numbering scheme. Non-H atoms are shown as displacement ellipsoids drawn at the 50% probability level.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4384560&req=5

fig1: The mol­ecular structure of (NH4)[Cr(pydc)2], showing the atom-numbering scheme. Non-H atoms are shown as displacement ellipsoids drawn at the 50% probability level.

Mentions: Counter-ionic species play a very important role in coordin­ation chemistry. The structure reported here is another example of a [Cr(pydc)2]− salt but with a different cation. The structural analysis shows that the two tridentate pyridine-2,6-di­carboxyl­ate (pydc) dianions octa­hedrally coordinate to the CrIII metal center through one N atom and two carboxyl­ate O atoms in a meridional arrangement. The CrIII ion is located on a crystallographic fourfold rotoinversion axis (). An ellipsoid plot of title complex together with the atomic numbering is illustrated in Fig. 1 ▸.


Crystal structure of ammonium bis-(pyridine-2,6-di-carboxyl-ato-κ(3) O,N,O')chromate(III) from synchrotron data.

Moon D, Choi JH - Acta Crystallogr E Crystallogr Commun (2015)

The mol­ecular structure of (NH4)[Cr(pydc)2], showing the atom-numbering scheme. Non-H atoms are shown as displacement ellipsoids drawn at the 50% probability level.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384560&req=5

fig1: The mol­ecular structure of (NH4)[Cr(pydc)2], showing the atom-numbering scheme. Non-H atoms are shown as displacement ellipsoids drawn at the 50% probability level.
Mentions: Counter-ionic species play a very important role in coordin­ation chemistry. The structure reported here is another example of a [Cr(pydc)2]− salt but with a different cation. The structural analysis shows that the two tridentate pyridine-2,6-di­carboxyl­ate (pydc) dianions octa­hedrally coordinate to the CrIII metal center through one N atom and two carboxyl­ate O atoms in a meridional arrangement. The CrIII ion is located on a crystallographic fourfold rotoinversion axis (). An ellipsoid plot of title complex together with the atomic numbering is illustrated in Fig. 1 ▸.

Bottom Line: The structure of the title compound, (NH4)[Cr(pydc)2] (pydc is pyridine-2,6-di-carboxyl-ate, C7H3NO4), has been determined from synchrotron data.The Cr(III) cation is coordinated by four O atoms and the two N atoms of two meridional pydc ligands, displaying a distorted octa-hedral geometry.The Cr-N and Cr-O bond lengths are 1.9727 (15) and 1.9889 (9) Å, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Republic of Korea.

ABSTRACT
The structure of the title compound, (NH4)[Cr(pydc)2] (pydc is pyridine-2,6-di-carboxyl-ate, C7H3NO4), has been determined from synchrotron data. The Cr(III) ion and the N atom of the ammonium cation are located on a crystallographic fourfold rotoinversion axis (-4). The Cr(III) cation is coordinated by four O atoms and the two N atoms of two meridional pydc ligands, displaying a distorted octa-hedral geometry. The Cr-N and Cr-O bond lengths are 1.9727 (15) and 1.9889 (9) Å, respectively. The crystal structure is stabilized by inter-molecular hydrogen bonds involving the N-H groups of the ammonium cation and pyridine C-H groups as donors and the non-coordinating carbonyl O atoms as acceptors.

No MeSH data available.


Related in: MedlinePlus