Related Experiment Video
Updated: Mar 28, 2026
Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Precise Control of Homochiral Multifunctional Dy2 Single-Molecule Magnets by Changing the Positions of the Two
Cai-Ming Liu1, Yi-Quan Zhang2, Xiang Hao1
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory for Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Abstract:
Two pairs of homochiral Dy2 zero-field single-molecule magnets (SMMs) derived from 3-(perfluorobutyryl)-(+)/(-)-camphor (D-Hpfc/L-Hpfc) were assembled by using two hydrazone Schiff bases with the same molecular formula but different heterocyclic rings (pyrazine vs pyrimidine) as bridging ligands. This provides an excellent opportunity to precisely regulate the homochiral multifunctional SMMs by altering the positions of the two heterocyclic nitrogen atoms in the Schiff base ligands. [Dy2(LSchiff1)2(D-pfc)2(MeOH)2] (D-1)/[Dy2(LSchiff1)2(L-pfc)2(MeOH)2] (L-1) [H2LSchiff1 = {2-[(E)-(3,5-difluoro-2-hydroxyphenyl)-methylidene]-diazanyl}-(pyrazin-2-yl)-methanone] is crystallized in the P2 1 space group, while [Dy2(LSchiff2)2(D-pfc)2(MeOH)2] (D-2)/[Dy2(LSchiff2)2(L-pfc)2(MeOH)2] (L-2) [H2LSchiff2 = {2-[(E)-(3,5-difluoro-2-hydroxyphenyl)-methylidene]-diazanyl}-(pyrimidin-4-yl)-methanone] is crystallized in the P1 space group; and only the octagon coordination configuration was observed for the Dy3+ ions of D-1/L-1, while both the octagon and the heptagonal pyramid coordination configurations were observed for the Dy3+ ions of D-2/L-2. As a result, D-1/L-1 shows single magnetic relaxation, while D-2/L-2 displays double magnetic relaxation, though intramolecular ferromagnetic interactions exist in both D-1/L-1 and D-2/L-2. The ab initio calculations were carried out to explain their magnetic properties. Moreover, the magneto-optic effects of D-1/L-1 and D-2/L-2 were detected by their magnetic circular dichroism spectra. Furthermore, these two pairs of enantiomers exhibit strong third harmonic generation (THG).
More Related Videos
Related Concept Videos
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
02:52Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
01:19Structure of Amines
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...
02:05Prochirality
02:42Valence Bond Theory