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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...
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Isomerism in Complexes
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...
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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...
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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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...
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Multicomponent Assembled Systems Based on Platinum(II) Terpyridine Complexes.

Zhao Gao1, Yifei Han1, Zongchun Gao1

  • 1CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Polymer Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China.

Accounts of Chemical Research
|October 25, 2018
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Summary
This summary is machine-generated.

This study explores multicomponent coassembly of platinum(II) terpyridine complexes to create advanced supramolecular materials. These novel assemblies exhibit enhanced functionality for applications in sensing and optoelectronics.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Platinum(II) terpyridine complexes are noted for their square-planar geometry and photophysical properties.
  • Bottom-up self-assembly is a key strategy for creating ordered supramolecular architectures.
  • Previous work focused on single-component assemblies; multicomponent systems are the next frontier.

Purpose of the Study:

  • To develop multicomponent coassembled systems using platinum(II) terpyridine complexes with other π-organic and organometallic molecules.
  • To impart advanced functionality through electron/energy transfer processes.
  • To explore the fabrication of discrete and extended multicomponent architectures.

Main Methods:

  • Construction of molecular tweezers and macrocycles incorporating platinum(II) terpyridine complexes.
  • Utilizing donor-acceptor charge-transfer and metal-metal interactions for guest encapsulation.
  • Incorporating intermolecular hydrogen bonds to enhance binding and stimuli-responsiveness.
  • Fabricating supramolecular polymers with controlled topologies.

Main Results:

  • Platinum(II) terpyridine-based receptors effectively encapsulate electron-rich guests.
  • Multilayer donor-acceptor stacks and supramolecular polymers with tunable properties were achieved.
  • Macrocyclic receptors showed superior guest accommodation compared to tweezers.
  • Stimuli-responsive elements enabled controlled guest capture and release.

Conclusions:

  • Multicomponent coassembly of platinum(II) terpyridine complexes offers a new route to functional supramolecular materials.
  • These materials hold promise for sensing, optoelectronics, and catalysis.
  • Precise control over assembly and understanding of driving forces are crucial for desired nanostructures.