Synthesis and crystal structure of a new polymorph of potassium europium(III) bis(sulfate) monohydrate, KEu(SO₄)₂·H₂O

Abstract

[2087][2088][2089][2090][2091][2092][2093][2094] in the monoclinic space group P2 1 /c with a similar structural connectivity and coordination environments to the present compound. Chemical contextThe design of new solids including rare earth metal ions is an emerging field because of their potential applications in catalysis, luminescence and optoelectronics (Ramya et al., 2012;Hö ppe, 2009;Mahata et al., 2008;Shehee et al., 2003). In general, the discovery of new solids is a major thrust in the field of solid-state research because of their diverse topological architectures and properties. In particular for rare earth metal compounds, the connectivity within the crystal structure becomes novel and complex as the coordination numbers are higher than for transition metals. In this regard, crystal engineering becomes challenging with non-centrosymmetric solids as it can lead to many chiral-related applications such as enantioselective separation, heterogeneous chiral catalysis or non-linear optical (NLO) effects (Ramya et al., 2012;Hö ppe, 2009;Mahata et al., 2008;Shehee et al., 2003;Halasyamani & Poeppelmeier, 1998;Sweeting & Rheingold, 1987). Obtaining new structures with various anions such as silicates, phosphates, phosphites, carboxylates, sulfates, arsenates, selenates, selenites, germanates, borates or thiosulfates is a long-standing research area (Sweeting et al., 1992;Paul, 2016;Paul et al., 2009Natarajan & Mandal, 2008;Natarajan et al., 2006;Feng et al., 2005;Hathwar et al., 2011;Held, 2014). A rare earth metal can be a better choice than a transition metal as it provides many variations arising from coordination preferences, ligand geometry and valence states. The presence of two metals in a crystal structure can introduce more structural variation along with specific properties. From earlier reports, it is obvious that the design of chiral frameworks mostly require chiral fragments or chiral ligands. The synthesis of sulfate compounds with a chiral