Open-Framework Zinc Phosphates Synthesized in the Presence of Structure-Directing Organic Amines

Building Open-Framework Metal Phosphates from Amine Phosphates and a Monomeric Four-Membered Ring Phosphate

“…13. Bifurcated layers have been observed earlier in open-framework zinc phosphates (14). It is interesting to note that Zn(2) links only with the two P(1) atoms and the remaining Zn}O linkages are terminal water which are pointed into the aperture and interacts with the framework via hydrogen bonding.…”

Layered Cobalt Phosphates by the Amine Phosphate Route

“…The layers in II are so formed that the cationic and the anionic layers alternate. The inorganic and organic layers are stacked in the ABABAB fashion just as in one of the open-framework zinc phosphates described recently (19).…”

1,5-Diaminopentane As A Structure-Directing Agent for Zincophosphate Networks: Zn3(PO4)2(C5H14N2)2·3H2O and C5H16N2·Zn3(PO4)2(HPO4)·H2O

“…The structure of 2, prepared from a reaction with a lower initial pH, is much more commonplace, and the "multipoint" N-HLO hydrogen bonds from the protonated template to the anionic ZnPO sheets have been seen in many other structures [5]. The triply-bridging O atom in the framework of 2 is also a known feature of porous [13] and dense (i.e., non-templated) [19] ZnPOs.…”

“…The water molecule accepts an O-HLO hydrogen bond from the hydrogen phosphate group and also probably forms O-HLO links to framework oxygen atoms. The protonated -NH 3 + groups of the H 2 dap cation form three N-HLO hydrogen bonds each (Table 4), which is a thoroughly typical bonding mode for a protonated amine in a ZnPO [5]. The conformation of the carbon chain of the H 2 dap species is somewhat uncertain, but its contorted geometry is clearly different to the extended conformation found for the bridging dap molecules in 1.…”

“…As might be OPEN ACCESS expected, the chain length n of the methylene groups of the diamine plays an important role in defining the resulting crystal structure: this is demonstrated with diamine-templated zinc phosphates (ZnPOs) and varied structures with n = 2 (i.e., ethylenediamine) [5], n = 3 [6], n = 4 [7] and n = 6 [8] have been described.…”