Related Experiment Video
Updated: Jun 23, 2026
Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
Weakly coordinating borophosphates - Ca0.5M(H2O)2[B(PO4)2]·H2O (M = Mg, Mn, Co, Zn, Cd)
Vivien Wessels1, Martina Mikuta1, Henning A Höppe1
1Professur für Festkörperchemie und Materialwissenschaften, Institute of Physics, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany. henning.hoeppe@physik.uni-augsburg.de.
None:
Up to now, a considerable number of borophosphates have been reported, despite the young history of this material class. However, detailed Tanabe-Sugano analyses to investigate the coordination strength of the host structures have barely been reported yet. Herein, the series Ca0.5M(H2O)2[B(PO4)2]·H2O with M = Ni, Fe was extended by introducing further metal cations with M = Mg, Mn, Co, Zn, Cd; the M atoms are coordinated octahedrally by oxygen and water. Thus, the reflection spectra for M = Mn, Co were elucidated by determining the Racah parameter and the ligand field splitting of the d-orbitals which revealed that borophosphates can be classified as weakly coordinating host materials. The crystal structure contains corner sharing borate and phosphate tetrahedra forming one-dimensional helical chains with water molecules inside those helices. Single-crystal data revealed the presence of systematically absent reflections in the original space group P6122 which was solved by losing the twofold axis, whereby the structure was refined in the trigonal subgroup P3121. Next to single-crystal XRD and UV-vis spectroscopy, the titled compounds were further characterised by powder XRD, FT-IR spectroscopy and thermal analysis.
More Related Videos
07:20Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
Published on: October 6, 2023
09:24Synthesis, Hemoglobin Encapsulation and Biorthogonal PEGylation in Hierarchically Porous UiO-66 Nanoparticles for Oxygen Delivery Applications
Published on: May 8, 2026
Related Concept Videos
02:42Valence Bond Theory
02:54Coordination Compounds and Nomenclature
02:57Coordination Number and Geometry
02:51Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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 eye.
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...