Related Experiment Video
Updated: Jul 9, 2026
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
A molecular 'LEGO®' approach to high-spin triangular {MnIIILn2} clusters from {MnIII} and {Ln2} metalloligands
Konstantinos N Pantelis1, Luís Cunha-Silva2,3, Mohamed R Saber4
1Department of Chemistry, University of Patras, Patras 26504, Greece. kostaspantelis95@gmail.com.
None:
A stepwise "LEGO®-brick" strategy has been employed for the targeted assembly of rare low-nuclearity MnIII/LnIII clusters from preformed molecular building units. The mononuclear MnIII metalloligand (Pr2NH2)[MnIII(sacb)2] (1; sacbH2 = N-salicylidene-2-amino-5-chlorobenzoic acid) was combined with newly isolated dinuclear lanthanide complexes [Ln2(sacb)(sacbH)3L(MeOH)] [LnIII = Dy (2), Gd (3); L- = 2-amino-5-chlorobenzoate], affording the trinuclear heterometallic compounds [MnIIILn2(sacb)3(sacbH)2L] [LnIII = Dy (4), Gd (5)]. Single-crystal X-ray diffraction studies revealed that 4 and 5 possess triangular {MnIIILn2(μ-O2CR)3}6+ cores, representing the first structurally characterized triangular {MnIIILn2} complexes and rare examples of triangular {MLn2} (M = any 3d-metal ion) clusters. Magnetic studies have demonstrated that the MnIII-free {Dy2} precursor 2 displays weak field-induced slow relaxation of magnetization, whereas incorporation of the Jahn-Teller active MnIII ion leads to ferromagnetically coupled {MnIIILn2} species. In particular, the {MnIIIGd2} analogue 5 exhibits a high-spin ground state of S = 9, with weak ferromagnetic MnIII⋯GdIII and GdIII⋯GdIII exchange interactions. Although no slow magnetic relaxation was observed for the trinuclear complexes, the results demonstrate that controlled integration of a MnIII metalloligand can promote ferromagnetic exchange in preassembled {Ln2} units and provide a direct route to structurally defined high-spin 3d/4f triangles.
More Related Videos
07:14Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
06:53Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
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 eye.
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
03:51Molecular Orbital Theory II
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...
02:51Metal-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...