Organoammonium diphosphopentamolybdates(VI): influence of organic cations and anion protonation on crystal packing and geometrical features of polyanion

Bis(iminodiethylenediammonium) di-μ5-hydrogenphosphato-pentamolybdate(VI) tetrahydrate

“…These bond distances are in accordance with those observed in (C 6 H 11 NH 3 ) 5 H(P 2 Mo 5 O 23 )Á4H 2 O (Wang et al, 2004) and (H 2 bpy (Lu et al, 2005). The PO 4 tetrahedra exhibit distorted geometry, with PÐO bond distances ranging from 1.514 (2) to 1.568 (2) A Ê and OÐPÐO bond angles of between 106.32 (12) and 110.99 (12) , which are in agreement with values reported previously (Aranzabe et al, 1997). Valence sum calculations (Brown & Altermatt, 1985) demonstrate that all Mo atoms in (I) have valence sums ranging from 5.835 to 5.987, with an average value of 5.925, very close to the ideal value of 6 for Mo VI .…”

“…Over the past few decades, polyoxometallates have been found to be extremely versatile inorganic building blocks for the construction of organic±inorganic hybrid materials, owing to the wide range of their topological properties and potential applications in catalysis, photochemistry, electrochromism and magnetism (Braun et al, 1999). An important class of metal oxide cluster based on molybdenum phosphate anions has been attracting much attention owing to the novel structures and unusual properties of these compounds (Guo & Liu, 2003); typical examples include (NH 4 ) 2 [(CH 3 ) 4 N] 2 [Fe 2 -Mo 12 O 30 (H 2 PO 4 ) 6 (HPO 4 ) 2 ] (Meyer & Haushalter, 1993), (H 2 en) 3 [P 2 Mo 5 O 23 ]Á6H 2 O (en is ethylenediamine; Aranzabe et al, 1997) (Lu et al, 1998), (H 2 en) 10 (H 3 O) 3 (H 5 O 2 )Na 2 [MnMo 12 O 24 (OH) 6 (PO 4 ) 4 -(HPO 4 ) 4 ][MnMo 12 O 24 (OH) 6 (PO 4 ) 6 (HPO 4 ) 2 ]Á9H 2 O (Xu et al, 1999), (C 4 H 12 N 2 ) 0.5 [Co(en) (Lu et al, 2005). Compared with ethylenediamine or pyridine templates, the hybrid materials containing diethylenetriamine (tren) or its ammonium cation remain largely unexplored (Lin et al, 2003).…”

Pentaguanidinium monohydrogendiphosphopentamolybdate(VI) 2.5-hydrate, (CH6N3)5[HP2Mo5O23]·2.5H2O: hydrogen bonding and π-stacking in guanidinium cations

“…Previous structural studies (Aranzabe et al, 1997;Upreti & Ramanan, 2006;Fischer et al, 1974) on the [HP 2 Mo 5 O 23 ] 5À anion have shown that, while the P-OH group does have a tendency to associate with the O 3 P O region in an adjacent anion, this is not always the case. In the title compound, (I) ( Fig.…”

Hydrothermal synthesis and crystal structure of (H2bpp)3[Mo5P2O23]·H2O: a twofold interpenetrating 3D supramolecular architecture constructed of Standberg-type polyoxometalate

“…x, y, z, h -x, -y, 1 -z, i -x, 1 -y, 1 -z Fig. 2 The 1D parallel arranged ladders were linked through bpp moleculars to form a wave-like sheet [22].…”