Related Experiment Video
Updated: May 30, 2025
Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
Synthesis, structures, and magnetic properties of alkali metal manganese(III) fluorophosphates containing
Xiedong Cheng1, Feifan Li1, Qingqing Huang2
1School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, Jiangsu, China. m.f.lv@hotmail.com.
Abstract:
Five alkali metal manganese(III) fluorophosphates, K2Mn(PO3F)F3 (I), Rb2Mn(PO3F)F3 (II), Rb2Mn2(PO3F)(PO4)F3 (III), Rb3Mn3(PO3F)2(PO4)F5 (IV), and CsMn(PO3F)F2 (V), were successfully synthesized using a hydrothermal method. The monofluorophosphate anion (PO3F)2- groups work as "chemical scissors" to promote low-dimensional spin structures with the aid of alkali metal cations. I and II had an S = 2 uniform chain structure formed by corner-sharing trans-MnO2F4 octahedra. III contained a quasi one-dimensional S = 2 spin chain composed of trans-MnO4F2 octahedra and trans-MnO2F4 octahedra through vertex-sharing fluorine atoms running along the [1-10] direction, whereas V exhibited a zigzag S = 2 spin chain built from the facial-MnO3F3 octahedron. In contrast, IV constitutes weakly coupled S = 2 spin trimers, where the three-dimensional (3D) framework contains two-dimensional {Mn3O4F4(PO3F)2}2- layers formed by trinuclear Mn-octahedral units via corner-sharing fluorine atoms separated by PO3F tetrahedra. Magnetic measurements confirmed that I and II possess antiferromagnetic (AFM) long-range ordering at low temperature, with intrachain exchange couplings Jintra/kB = -12.1(1) K for I and Jintra/kB = -8.1(2) K for II. The magnetic behaviour of IV was very complex, with three successive magnetic transitions owing to weak AFM coupling among S = 2 spin trimers. V shows an alternating S = 2 one-dimensional (1D) chain with canted AFM ordering at 16.5 K.
Related Concept Videos
02:42Valence Bond Theory
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
02:42Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
03:24Hybridization of Atomic Orbitals I
03:35Hybridization of Atomic Orbitals II
02:28Electronic Structure of Atoms
An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...