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

✍ Scribed by William T.A. Harrison; Zsolt Bircsak; Lakshitha Hannooman

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 386 KB
• Volume: 134
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7566

✦ Synopsis

The solution-mediated syntheses, single crystal structures, and physical properties (TGA, IR) of RbZn 2 (HPO 4 ) 2 (H 2 PO 4 ) • 2H 2 O and RbZn(HPO 4 )(H 2 PO 4 ) • H 2 O are reported. RbZn 2 (HPO 4 ) 2 (H 2 PO 4 ) • 2H 2 O is a new noncentrosymmetric layered phase built up from ZnO 6 , ZnO 4 , and PO 4 polyhedra-sharing vertices as Zn-O-P and Zn-O-Zn bonds. Eleven-coordinate rubidium cations provide interlayer charge compensation for the anionic Zn /P/O/H sheets. RbZn(HPO 4 )(H 2 PO 4 ) • H 2 O is isostructural with NH 4 Zn(HPO 4 )(H 2 PO 4 ) • H 2 O and consists of infinite chains of tetrahedral 4-rings connected by Zn-O-P bonds. Crystal data for RbZn 2 (HPO 4 ) 2 (H 2 PO 4 ) • 2H 2 O is: M r ‫؍‬ 541.20, orthorhombic, space group P2 l 2 l 2 l (No. 19), a ‫؍‬ 7.6458(9), b ‫؍‬ 9.965(2), c ‫؍‬ 15.603(3) A s , V ‫؍‬ 1188.8(3) A s 3 , Z ‫؍‬ 4, R(F) ‫؍‬ 3.90%, R w (F) ‫؍‬ 3.91%, (1695 observed reflections with I > 3 (I)). Crystal data for RbZn(HPO 4 )(H 2 PO 4 ) • H 2 O is M r ‫,38.163؍‬ triclinic, space group P1 (No. 2), a ‫؍‬ 7.712(2), b ‫؍‬ 7.9824(7), c ‫؍‬ 8.0422(9) A s , ‫؍‬ 64.313(7)°, ‫؍‬ 84.90(2)°, ‫؍‬ 72.364(9)°, V ‫؍‬ 424.6(2) A s 3 , Z ‫؍‬ 2, R(F) ‫؍‬ 3.97%, R w (F) ‫؍‬ 4.24%, (1794 observed reflections with I > 3 (I)).