Syntheses and Crystal Structures of Two New Hydrated Rubidium Zinc Phosphates: RbZn2(HPO4)2(H2PO4)·2H2O, a Layered Phase Containing Octahedral and Tetrahedral Zinc Centers, and RbZn(HPO4)(H2PO4)·H2O Containing One-Dimensional Chains of 4-Rings

Hydrothermal Synthesis and Crystal Structure of Zn4(PO4)2(HPO4)2·0.5(C10H28N4)·2H2O, a New Layered Zinc Phosphate with 12-Ring Cavities

“…The P(1) atom forms two P}O}Zn bonds via oxygen bridges and has two uncoordinated oxygen atoms: O(5), a terminal }OH group with bond length d[P(1)}O (5) those of PO . Similar P}OH bond lengths are also reported in other layered zinc phosphates (5,23,27).…”

Ammonium zinc phosphate, (NH4)Zn(HPO4)(H2PO4)

“…The chains are built up from polyhedral 4rings with the zinc centres serving to fuse the 4-rings into chains, which results in the 1:2 Zn:P ratio. Similar zincophosphate 4-ring chains have been seen in RbZn(HPO 4 )(H 2-PO 4 )ÁH 2 O (Harrison et al, 1997) and N 2 C 6 H 14 ÁZn-(HPO 4 ) 2 ÁH 2 O (Chavez et al, 1999). In (NH 4 )Zn(HPO 4 )-(H 2 PO 4 ), four O atoms serve as ZnÐOÐP links ( av = 128.5 ) and four are terminal to P. Assuming the presence of ammonium cations rather than unprecendented neutral ammonia, three H atoms are required for charge balancing.…”

“…Similar zincophosphate 4-ring chains have been seen in RbZn(HPO 4 )(H 2 PO 4 ) . H 2 O (Harrison et al, 1997) and N 2 C 6 H 14 . Zn(HPO 4 ) 2 .…”

“…In (NH 4 )Zn(HPO 4 )(H 2 PO 4 ), four O atoms serve as Zn-O-P links (θ av = 128.5°) and four are terminal to P. Assuming the presence of ammonium cations rather than unprecendented neutral ammonia, three H atoms are required for charge balancing. The structures of similar phases (Harrison et al, 1997;Bircsak & Harrison, 1998) indicate that they are almost certainly associated with terminal P-O bonds. In (NH 4 )Zn(HPO 4 )(H 2 PO 4 ), two of these are well defined and the P1-O6 and P2-O7 bonds show their expected P-O bond lengths (Lightfoot & Masson, 1996).…”

“…The title compound complements the known ammonium zinc phosphates (NH 4 )Zn(HPO 4 )(H 2 PO 4 )ÁH 2 O (Boudjada et al, 1980), (NH 4 )Zn 2 (PO 4 )(HPO 4 ) (Bircsak & Harrison, 1998), (NH 4 )ZnPO 4 ±ABW and (NH 4 )ZnPO 4 ±HEX (Xu et al, 1998). The ®rst two phases are layered with respect to the connectivity of the tetrahedral ZnO 4 /PO 4 building units whereas the latter two are three-dimensional and resemble related aluminosilicate zeolites (Harrison, 2000).…”