Ultra-flexible framework breathing in response to dehydration in liskeardite, [(Al,Fe)16(AsO4)9(OH)21(H2O)11]·26H2O, a natural open-framework compound

M3+(H2AsO4)(H2As2O7) (M3+= Al, Ga) and In2(H2AsO4)2(H2As2O7)2: a new layer structure type and a new framework structure type containing the rare H2As2O72−group

“…Hydrous Al arsenates include the minerals mansfieldite (already mentioned above), bulachite, Al 2 AsO 4 -(OH) 3 Á3H 2 O (Frau & Da Pelo, 2001; structure unknown), (Grey et al, 2016;Grey, Kampf et al, 2015), as well as liskeardite, (Al,Fe) 32 (AsO 4 ) 18 (OH) 42 -(H 2 O) 22 Á52H 2 O (Grey et al, 2013). A structurally characterized dehydration product of liskeardite has the formula [Al 16 -(AsO 4 ) 9 (OH) 21 (H 2 O) 11 ]Á8H 2 O (Grey, Brand et al, 2015). Cr(H 2 As 2 O 7 )(As 4 O 12 ) (Jansen & Brachtel, 1980) is the only other structurally characterized arsenate containing the H 2 As 2 O 7 2À group; it is also closely related to the Al(H 2 AsO 4 )-(H 2 As 2 O 7 ) structure type presented in this study (see below).…”

Formation peculiarities of iron (III) acetate: potential precursor for iron metal-organic frameworks (MOFs)

“…However, most of these methods suffer from a number of disadvantages, such as small quantities of the product, and the assembly of nanostructures is usually a secondary process. Besides, complex architectures are often found among metalorganic framework compounds [25,26]. The mixedmetal approach to this type of materials offers an additional degree of structural complexity, and a potential tunability of their properties, which remains largely unexplored.…”