Synthesis, Crystal Structure and Characterization of a new Protonated Magnesium Borophosphate: (H₃O)Mg(H₂O)₂[BP₂O₈]·H₂O

Abstract

A new protonated borophosphate (H 3 O)Mg(H 2 O) 2 [BP 2 O 8 ]· H 2 O (1) was synthesized under mild hydrothermal conditions and characterized by single-crystal X-ray diffraction, FTIR spectroscopy and TG-DTA. The compound crystallizes in the hexagonal system, space group P6(1)22 (No 178), a = 9.4462(7) Å, c = 15.759(2) Å, V = 1217.8(2) Å 3 , and Z = 6. There exist infinite helical 1 ∞ {[BP 2 O 8 ] 3-} ribbons built up from corner-sharing PO 4 and BO 4 tetrahedra, which are 137 connected by MgO 4 (H 2 O) 2 leading to an infinite three-dimensional open-framework. The H 3 O + ions are located at the free thread of the helical ribbons, whereas crystallized water occupy the channels of the helical ribbons. The dehydration of the compound occurs at a higher temperature which is presumably due to the anisotropic hydrogen bonds in the crystal structure. The luminescent properties of the compound were studied.

Li3Cs2M2B3P6O24(M = Pb, Sr): borophosphates with double six-membered ring of [BP2O8]3−

“…Their photoluminescence may be related to the excitation originated from various lattice defects in their 3D anionic framework structure. The emission spectral wavelengths are similar to the reported protonated magnesium borophosphate compound (H 3 O)Mg(H 2 O) 2 [BP 2 O 8 ]•H 2 O 35.…”

Chain caesium borophosphates with B:P ratio 1:2: synthesis, structure relationships and low-temperature thermodynamic properties

“…Within the A x M y (H 2 O) 2 [BP 2 O 8 ]Áz(H 2 O) series, borophosphates with the following cations have been reported: A I = Li, Na, K, Rb, Cs, H 3 O, Ag and NH 4 ; A II = Ca; M II = Mg, Sc, Mn, Fe, Co, Ni, Cu, Zn, Cd; and M III = Fe, In (Ge et al, 2003(Ge et al, , 2005Yang et al, 2010;Yilmaz et al, 2000Yilmaz et al, , 2005Wang, 2008;Boy & Kniep, 2001a,b;Menezes et al, 2007Menezes et al, , 2008Zouihri et al, 2011aZouihri et al, ,b, 2012Guesmi & Driss, 2012;Zheng & Zhang, 2009;Ewald et al, 2006;Baykal et al, 2000;Boy et al, 2001a,b;Boy, Stowasser et al, 2001;Kniep et al, 1997;Zhuang et al, 2008;Engelhard, 2000;Schä fer et al, 2002;Lin et al, 2008). However, the structural data for members of this family with large alkaline cations Rb + and Cs + have not been presented in the literature, to our knowledge.…”