Crystal structure of an organic-inorganic hybrid compound based on morpholinium cations and a β-type Anderson polyanion.

Tamara J Lukianova,Adam Pietraszko,Vasyl Kinzhybalo

doi:10.1107/s2056989015019246

Abstract

A new organic-inorganic hybrid compound, penta-morpholinium hexa-hydrogen hexa-molybdoferrate(III) sulfate 3.5-hydrate, (C4H10NO)5[Fe(III)(OH)6Mo6O18](SO4)·3.5H2O, was obtained from an aqueous solution. The polyoxidomolybdate (POM) anion is of the Anderson β-type with a central Fe(III) ion. Three of five crystallographically independent morpholinium cations are disordered over two sets of sites. An intricate network of inter-molecular N-H⋯O and O-H⋯O inter-actions between cations, POMs, sulfate anions and non-coordinating water mol-ecules creates a three-dimensional network structure.

Highlights

A new organic–inorganic hybrid compound, pentamorpholinium hexahydrogen hexamolybdoferrate(III) sulfate 3.5-hydrate, (C4H10NO)5[FeIII(OH)6Mo6O18](SO4)3.5H2O, was obtained from an aqueous solution
The polyoxidomolybdate (POM) anion is of the Anderson -type with a central FeIII ion
-type Anderson polyoxidoanions, which are characterized by a planar arrangement of the metal atoms, each MoVI atom has two terminal oxygen atoms, two bridging O atoms and two bridging OH functions which make it highly reactive and coordinated by varieties of transition metal atoms in the anion

Summary

Chemical context

Polyoxidometalates (POM) are attractive molecular building blocks used in the formation of multidimensional organic–. Inorganic hybrid networks during self-organization processes (Pope & Müller, 2001; Müller et al, 1998; Long et al, 2007). Several related compounds with Anderson-type polyoxidometalate anions and organic cations, such as (C4H12N2)5[Al(OH)6Mo6O18]2(SO4)216H2O (Yang et al, 2009), (C4H10NO)3[Cr(OH)6Mo6O18]4H2O (Yang et al, 2011), (C6H10N3O2)2Na(H2O)2[Al(OH)6Mo6O18]6H2O (Thabet et al, 2012) and other compounds with an FeIII central ion (Marcoux et al, 2003; Allain et al, 2008; Dessapt et al, 2011) have been reported. Minor parts of the disordered cations are shown with dashed bonds.

Structural commentary

Supramolecular features

Synthesis and crystallization

Refinement