Pyridinium diaquabis(methylenediphosphonato-κ2O,O′)chromate(III) tetrahydrate

Kina Van Der Merwe,Hendrik G Visser,J A Venter

doi:10.1107/s1600536810028990

Kina Van Der Merwe, Hendrik G Visser + Show 1 more

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https://doi.org/10.1107/s1600536810028990

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Abstract

In the title complex, (C5H6N)[Cr(CH4O6P2)2(H2O)2]·4H2O, the CrIII atom, lying on an inversion centre, is coordinated by two bidentate methylene diphosphonate ligands and two water molecules in a distorted octahedral coordination geometry. The pyridinium cation is located on an inversion centre, with an N atom and a C atom sharing a position each at a half occupancy. A three-dimensional network is constructed by O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds between the pyridinium cation, complex anion and uncoordinated water molecules.

Highlights

In the title complex, (C5H6N)[Cr(CH4O6P2)2(H2O)2]Á4H2O, the CrIII atom, lying on an inversion centre, is coordinated by two bidentate methylene diphosphonate ligands and two water molecules in a distorted octahedral coordination geometry
The pyridinium cation is located on an inversion centre, with an N atom and a C atom sharing a position each at a half occupancy
A three-dimensional network is constructed by O—HÁ Á ÁO, N—HÁ Á ÁO and C—HÁ Á ÁO hydrogen bonds between the pyridinium cation, complex anion and uncoordinated water molecules

Summary

Structure Reports Online

In the title complex, (C5H6N)[Cr(CH4O6P2)2(H2O)2]Á4H2O, the CrIII atom, lying on an inversion centre, is coordinated by two bidentate methylene diphosphonate ligands and two water molecules in a distorted octahedral coordination geometry. The pyridinium cation is located on an inversion centre, with an N atom and a C atom sharing a position each at a half occupancy. A three-dimensional network is constructed by O—HÁ Á ÁO, N—HÁ Á ÁO and C—HÁ Á ÁO hydrogen bonds between the pyridinium cation, complex anion and uncoordinated water molecules. Related literature For general background to metal-organic frameworks with diphosphonic acids, see: Barthelet et al (2002). See: Byun et al (2006); Suh et al (1997); Van der Merwe et al (2009); Visser et al (2010)

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