Related Experiment Video
Updated: Jun 3, 2026
07:14
Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
A neutral Pt3 stack unsupported by any bridging ligand.
Lars Holland1, Wei-Zheng Shen, Philipp von Grebe
1Fakultät Chemie, Technische Universität Dortmund, 44221, Dortmund, Germany.
Dalton Transactions (Cambridge, England : 2003)
|April 7, 2011
Summary
Platinum-2-(3'-pyrazolyl)pyridine complexes exhibit unique crystallization. These interactions lead to a three-molecule stack without bridging ligands, driven by platinum-d(8) orbitals and ligand π-π stacking.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Understanding metal-ligand interactions is crucial for designing novel materials.
- Crystallization behavior of platinum complexes can be influenced by electronic and steric factors.
Purpose of the Study:
- To elucidate the driving forces behind the crystallization of trans-Pt(pyzpy)(2).
- To investigate the role of platinum-platinum interactions and ligand stacking in crystal formation.
Main Methods:
- Single-crystal X-ray diffraction analysis.
- Computational modeling to study electronic interactions (d(8) orbitals).
- Spectroscopic analysis of the pyzpy ligand.
Main Results:
- Observed a unique crystallization of trans-Pt(pyzpy)(2) forming a three-molecule stack.
- Identified Pt···Pt···Pt interactions involving d(8) orbitals as a key factor.
- Demonstrated the contribution of π-π stacking of deprotonated pyzpy ligands to the crystal structure.
Conclusions:
- The crystallization is driven by a combination of metal-metal and π-π stacking interactions.
- This supramolecular assembly occurs without the need for bridging ligands.
- The findings provide insights into the self-assembly of platinum complexes.
More Related Videos
Related Concept Videos
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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...
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...
01:22EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
01:26EDTA: Auxiliary Complexing Reagents
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
01:19Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...