Related Experiment Video
Updated: Jan 12, 2026
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
From 1D to 3D: dimensional control of low-coordinate lanthanide coordination polymers with SMM behavior and
Xiang-Tao Dong1,2, Ting Zhu1, Rong-Yan Zhang1
1State Key Laboratory of Materials-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China. guopeng@njtech.edu.cn.
Abstract:
The self-assembly of 1,1',1''-((2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene))tris(pyridin-4(1H)-one) (TTP) ligand with Dy(III) ions affords three lanthanide coordination polymers: [Dy(TTP)2(H2O)]Cl3·C3H6O·7H2O (1), [Dy(TTP)2](CF3SO3)3·2H2O (2), and [Dy(TTP)2(H2O)](CF3SO3)3·2H2O (3). The structural dimensionality of complexes 1-3 varies from one-dimensional (1D) to three-dimensional (3D) depending on the reaction conditions and crystallization methods. Complexes 1 and 3 consist of a 1D polymeric chain and a 3D framework, respectively, formed from seven-coordinate Dy(III) ions and TTP linkers. The Dy(III) ion in complex 1 adopts an intermediate geometry between a capped trigonal prism and a capped octahedron, while that in complex 3 shows a pentagonal bipyramidal geometry. Complex 2 exhibits a two-dimensional (2D) network, where the Dy(III) ion adopts a six-coordinate octahedral coordination geometry. Magnetic studies revealed that complex 1 exhibits slow magnetic relaxation at a zero static field, while this behavior in complexes 2 and 3 is field-induced, occurring only under a static field. Solid-state luminescence investigations demonstrated that complexes 1-3 exhibit excitation-dependent emissions, with their emission color tunable from yellow to white across different excitation wavelengths. The magnetic properties and yellow emissions of the products are determined by the coordination environments and geometries around the Dy(III) ions.
More Related Videos
Related Concept Videos
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...
02:42Valence Bond Theory
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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...