Synthesis and Crystal Structure of the Octahedral—Tetrahedral Framework Indium Phosphate Cs[In2(PO4)(HPO4)2(H2O)2]

✍ Scribed by Sandeep S. Dhingra; Robert C. Haushalter

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 221 KB
• Volume: 112
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1271

✦ Synopsis

The reaction of (\mathrm{InCl}{3}, \mathrm{H}{3} \mathrm{PO}{4}, \mathrm{CsVO}{3}), TMAOH (tetramethyl ammonium hydroxide), and (\mathrm{H}{2} \mathrm{O}) in the molar ratios (2: 6: 1: 1: 125) under hydrothermal conditions at (200^{\circ} \mathrm{C}) for 2 days yielded pale yellow crystals of (\mathrm{Cs}\left[\mathrm{In}{2}\left(\mathrm{PO}{4}\right)\left(\mathrm{HPO}{4}\right){2}\left(\mathrm{H}{2} \mathrm{O}\right){2}\right]) (1). Phosphate (1) crystallizes in the monoclinic space group (P 2{1} / c) (No. 14) with (a=) (6.580(2) \AA, b=18.092(1) \AA, c=10.180(1) \AA, \beta=97.92(2)^{\circ}, \mathrm{V}=) (1200.2(4) \AA^{3}, Z=4), and (D_{\text {cal }}=3.76 \mathrm{~g} \mathrm{~cm}^{-3} ; R / R_{w}=0.036 / 0.044) for 2855 reflections with (2 \theta<60.1^{\circ}) and (I \geq 3 \sigma(I)). The framework consists of corner-sharing indium octahedra and phosphate tetrahedra that form one-dimensional ribbons extending down the (c) axis, parallel to the crystallographic (100) plane, which interconnect to form the three-dimensional structure. The framework has large cavities in which the (\mathrm{Cs}^{+})cations reside. 1994 Academic Press, Inc.