CHED 1169 |
| Hybrid solids, made of chemically dissimilar components, have drawn much interest in advanced materials synthesis due to their structural versatility and multifunctional properties. For example, metal-organic frameworks (MOFs) have been extensively explored for their potential applications in technologically important areas including heterogeneous catalysis, gas storage, and sensors. A newly emerging area of hybrid materials includes salt-inclusion solids (SISs). These fully-inorganic SISs have structural chemistry complementary to MOFs where bonding at the interface of the dissimilar lattices is directional. Recent endeavors in the area of salt-inclusion chemistry have been mostly focused on creating mixed framework solids containing transition metal phosphates, arsenates, and silicates. We have substituted previously used (XO4)3- oxyanions (X = P, As), with the fully oxidized (VO4)3- anion unveiling extremely rich structural chemistry. Mixed-transition-metal systems are particularly attractive because they have more potential applications in the areas coupled to catalysis, batteries, or magnetism. This is in part due to variable oxidation states of the added transition metals as well as the unique frameworks created by the salt. Here we report 4 new noncentrosymmetric (NCS) salt inclusion vanadates synthesized using high temperature molten salt methods, namely (RbCl)2Mn(VO3), 1, (CsCl)2Mn(VO3)2, 2, (CsBr)2Mn(VO3)2, 3, and (CsCl)2Cu(VO3)2, 4. The structures contain ReO3-type slabs of single M–X (M = Mn, Cu, and X = Cl, Br) sheets interlinked by metavanadate chains. These compounds are isomorphous adopting two different NCS structure types where their difference becomes evident only in the propagation directions of the metavanadate chains. The acentricity of these materials is attributed to the acentric Cl-centered salt units and oriented noncentrosymmetric VO4 units whose polar axes point in one direction. Here we will report the synthesis and structure characterization of this family of NCS salt-inclusion vanadates. |
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Undergraduate Research Poster Session: Inorganic Chemistry
2:00 PM-4:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Poster
Division of Chemical Education |