22  New compounds and structures in the solid state

Hix, Gary B.

doi:10.1039/b312101c

Cited by 3 publications

(1 citation statement)

References 187 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The huge variety of known and potential inorganic framework materials offers an opportunity to explore fundamental materials chemistry and to develop materials displaying a range of diverse and exploitable properties. This has driven much research in recent years and has led to the discovery of many new systems, including those based on purely inorganic frameworks (e.g., metal phosphate zeotypes) and, more recently, the hybrid metal−organic frameworks (MOFs) . Significant progress has also been made in harnessing their potential, as exemplified by the development of materials whose open framework structures can be tailored to control and catalyze organic reactions …”

Section: Introductionmentioning

confidence: 99%

Jahn−Teller Distorted Frameworks and Magnetic Order in the Rb−Mn−P−O System

2009

View full text Add to dashboard Cite

Two previously uncharacterized members of the Rb-Mn-P-O system, RbMnP(2)O(7) and beta-RbMnHP(3)O(10), have been synthesized using a phosphoric acid flux synthetic route and their crystal and magnetic structures determined using neutron powder diffraction. The crystal structure of RbMnP(2)O(7) (space group P2(1)/c, a = 7.3673(2) A, b = 9.6783(2) A, c = 8.6467(2) A, and beta = 105.487(1) degrees) was found to be isostructural with RbFeP(2)O(7). The polymorph beta-RbMnHP(3)O(10) was also isolated as a single phase and found to crystallize in the space group C2 (a = 12.2066(5) A, b = 8.5243(3) A, c = 8.8530(4) A, beta = 107.233(2) degrees). Both structures consist of frameworks of corner-sharing MnO(6) octahedra linked together by condensed phosphate anions, with Rb(+) cations located in the intersecting channels. In both cases the Mn(3+) octahedra exhibit unusual Jahn-Teller distortions indicative of a plasticity effect driven by the steric requirements of the condensed phosphate anions, and this causes a strong violet coloration similar to that observed in the manganese violet pigment; the structure of this has yet to be determined. Magnetic susceptibility measurements show that both RbMnP(2)O(7) (T(N) = 20 K) and beta-RbMnHP(3)O(10) (T(N) = 10 K) undergo a phase transition at low temperatures to an antiferromagnetically ordered state. Low-temperature neutron powder diffraction studies show that the magnetic ground states of each of these materials involve both ferromagnetic and antiferromagnetic super-superexchange interactions between orbitally ordered Mn(3+), which are mediated by PO(4) tetrahedra. These interactions are compared and discussed.

show abstract

Section: Introductionmentioning

confidence: 99%