Ionothermal
Synthesis, Crystal Structure, and Magnetic
Study of Co<sub>2</sub>PO<sub>4</sub>OH Isostructural with Caminite
Guangmei Wang
Martin Valldor
Eike T. Spielberg
Anja-Verena Mudring
10.1021/ic4029904.s002
https://acs.figshare.com/articles/journal_contribution/Ionothermal_Synthesis_Crystal_Structure_and_Magnetic_Study_of_Co_sub_2_sub_PO_sub_4_sub_OH_Isostructural_with_Caminite/2314480
A new framework cobalt(II) hydroxyl
phosphate, Co<sub>2</sub>PO<sub>4</sub>OH, was prepared by ionothermal
synthesis using 1-butyl-4-methyl-pyridinium
hexafluorophosphate as the ionic liquid. As the formation of Co<sub>2</sub>PO<sub>4</sub>F competes in the synthesis, the synthesis conditions
have to be judiciously chosen to obtain well-crystallized, single
phase Co<sub>2</sub>PO<sub>4</sub>OH. Single-crystal X-ray diffraction
analyses reveal Co<sub>2</sub>PO<sub>4</sub>OH crystallizes with space
group <i>I</i>4<sub>1</sub>/<i>amd</i> (<i>a</i> = <i>b</i> = 5.2713(7) Å, <i>c</i> = 12.907(3) Å, <i>V</i> = 358.63(10) Å<sup>3</sup>, and <i>Z</i> = 4). Astonishingly, it does not crystallize
isotypically with Co<sub>2</sub>PO<sub>4</sub>F but rather isotypically
with the hydroxyl minerals caminite Mg<sub>1.33</sub>[SO<sub>4</sub>(OH)<sub>0.66</sub>(H<sub>2</sub>O)<sub>0.33</sub>] and lipscombite
Fe<sub>2–<i>y</i></sub>PO<sub>4</sub>(OH) (0 ≤ <i>y</i> ≤ 2/3). Phosphate tetrahedra groups interconnect
four rod-packed face-sharing <sub>∞</sub><sup>1</sup>{CoO<sub>6/2</sub>} octahedra chains to form
a three-dimensional framework structure. The compound Co<sub>2</sub>PO<sub>4</sub>OH was further characterized by powder X-ray diffraction,
Fourier transform–infrared, and ultraviolet–visible
spectroscopy, confirming the discussed structure. The magnetic measurement
reveals that Co<sub>2</sub>PO<sub>4</sub>OH undergoes a magnetic transition
and presents at low temperatures a canted antiferromagnetic spin order
in the ground state.
2014-03-17 00:00:00
Co 2PO Isostructural
Co 2PO
synthesis
Co 2PO crystallizes
compound Co 2PO